diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/controller/PostingControllerSpec.java b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/controller/PostingControllerSpec.java
index 1538717d1..b11e2105e 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/controller/PostingControllerSpec.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/controller/PostingControllerSpec.java
@@ -71,6 +71,10 @@ ResponseEntity<CursorPaginatedApiResponse<PostingListResponseDto>> getPostingsWi
                 mediaType = "application/json",
                 schema = @Schema(implementation = ErrorResponse.class),
                 examples = {
+                    @ExampleObject(
+                        name = "존재하지 않는 공고",
+                        value = "{\"code\" : \"B007\"}"
+                    ),
                     @ExampleObject(
                         name = "지원하고자 하는 공고 일정 찾을 수 없음",
                         value = "{\"code\" : \"B010\"}"
@@ -78,7 +82,25 @@ ResponseEntity<CursorPaginatedApiResponse<PostingListResponseDto>> getPostingsWi
                     @ExampleObject(
                         name = "이미 근무중인 사용자입니다.",
                         value = "{\"code\" : \"B018\"}"
+                    ),
+                    @ExampleObject(
+                        name = "모집이 종료된 공고 (OPEN 이 아닌 상태)",
+                        value = "{\"code\" : \"B001\", \"message\" : \"모집이 종료된 공고입니다.\"}"
+                    ),
+                    @ExampleObject(
+                        name = "이미 지원한 공고 (같은 공고의 다른 근무일정 포함)",
+                        value = "{\"code\" : \"B001\", \"message\" : \"이미 지원한 공고입니다.\"}"
                     )
+                })),
+        @ApiResponse(responseCode = "429", description = "429 Error 실패 케이스",
+            content = @Content(
+                mediaType = "application/json",
+                schema = @Schema(implementation = ErrorResponse.class),
+                examples = {
+                    @ExampleObject(
+                        name = "동시 지원 요청이 몰려 잠금 획득에 실패",
+                        value = "{\"code\" : \"E001\"}"
+                    ),
                 }))
     })
     ResponseEntity<CommonApiResponse<Void>> applyIntoPosting(
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingRequestDto.java b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingRequestDto.java
index 0fe9f6a8f..4dd6cafcf 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingRequestDto.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingRequestDto.java
@@ -1,16 +1,17 @@
 package com.dreamteam.alter.adapter.inbound.general.posting.dto;
 
+import com.dreamteam.alter.domain.posting.command.CreatePostingCommand;
 import com.dreamteam.alter.domain.posting.type.PaymentType;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.Valid;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotEmpty;
+import jakarta.validation.constraints.NotNull;
 import jakarta.validation.constraints.Positive;
 import lombok.*;
 
 import java.util.List;
 
-import javax.validation.constraints.NotNull;
-
 @Getter
 @NoArgsConstructor(access = AccessLevel.PRIVATE)
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
@@ -47,6 +48,18 @@ public class CreatePostingRequestDto {
             "}" +
         "]")
     @Valid
-    private List<CreatePostingScheduleRequestDto> schedules;
+    @NotEmpty
+    private List<@NotNull @Valid CreatePostingScheduleRequestDto> schedules;
+
+    public CreatePostingCommand toCommand() {
+        return new CreatePostingCommand(
+            workspaceId,
+            title,
+            description,
+            payAmount,
+            paymentType,
+            schedules.stream().map(CreatePostingScheduleRequestDto::toCommand).toList()
+        );
+    }
 
 }
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingScheduleRequestDto.java b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingScheduleRequestDto.java
index 5fd697d7e..26fbf9941 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingScheduleRequestDto.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/general/posting/dto/CreatePostingScheduleRequestDto.java
@@ -1,5 +1,6 @@
 package com.dreamteam.alter.adapter.inbound.general.posting.dto;
 
+import com.dreamteam.alter.domain.posting.command.PostingScheduleCommand;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotEmpty;
@@ -38,4 +39,8 @@ public class CreatePostingScheduleRequestDto {
     @NotBlank
     private String position;
 
+    public PostingScheduleCommand toCommand() {
+        return new PostingScheduleCommand(workingDays, startTime, endTime, positionsNeeded, position);
+    }
+
 }
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingController.java b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingController.java
index 6d34852c7..5f4e68fae 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingController.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingController.java
@@ -77,7 +77,9 @@ public class ManagerPostingController implements ManagerPostingControllerSpec {
     public ResponseEntity<CommonApiResponse<Void>> createPosting(
         @Valid CreatePostingRequestDto request
     ) {
-        createPosting.execute(request);
+        ManagerActor actor = ManagerActionContext.getInstance().getActor();
+
+        createPosting.execute(request.toCommand(), actor);
         return ResponseEntity.ok(CommonApiResponse.empty());
     }
 
@@ -155,7 +157,7 @@ public ResponseEntity<CommonApiResponse<Void>> updatePosting(
     ) {
         ManagerActor actor = ManagerActionContext.getInstance().getActor();
 
-        managerUpdatePosting.execute(postingId, request, actor);
+        managerUpdatePosting.execute(postingId, request.toCommand(), actor);
         return ResponseEntity.ok(CommonApiResponse.empty());
     }
 
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingControllerSpec.java b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingControllerSpec.java
index f7437d7e3..b834c7b5a 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingControllerSpec.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/controller/ManagerPostingControllerSpec.java
@@ -39,6 +39,10 @@ public interface ManagerPostingControllerSpec {
                 mediaType = "application/json",
                 schema = @Schema(implementation = ErrorResponse.class),
                 examples = {
+                    @ExampleObject(
+                        name = "존재하지 않거나, 자신이 관리하지 않거나, 활성화되지 않은 업장",
+                        value = "{\"code\" : \"B008\"}"
+                    ),
                     @ExampleObject(
                         name = "서버 내부 오류",
                         value = "{\"code\" : \"C001\"}"
@@ -155,7 +159,10 @@ ResponseEntity<CommonApiResponse<Void>> updatePostingStatus(
         @Valid @RequestBody UpdatePostingStatusRequestDto request
     );
 
-    @Operation(summary = "매니저 - 내가 등록한 공고 내용 수정", description = "")
+    @Operation(
+        summary = "매니저 - 내가 등록한 공고 내용 수정",
+        description = "수정을 마친 뒤 남은 근무일정이 하나도 없으면 공고가 모집 완료(CLOSED)로 바뀌며 더 이상 지원을 받지 않습니다."
+    )
     @ApiResponses(value = {
         @ApiResponse(responseCode = "200", description = "공고 내용 수정 성공"),
         @ApiResponse(responseCode = "400", description = "실패 케이스",
@@ -167,14 +174,6 @@ ResponseEntity<CommonApiResponse<Void>> updatePostingStatus(
                         name = "존재하지 않는 공고",
                         value = "{\"code\" : \"B007\"}"
                     ),
-                    @ExampleObject(
-                        name = "등록되지 않은 키워드로 요청",
-                        value = "{\"code\" : \"B006\"}"
-                    ),
-                    @ExampleObject(
-                        name = "요청에 키워드가 포함되지 않은 경우",
-                        value = "{\"code\" : \"B001\"}"
-                    ),
                 })),
         @ApiResponse(responseCode = "404", description = "404 Error 실패 케이스",
             content = @Content(
@@ -190,6 +189,16 @@ ResponseEntity<CommonApiResponse<Void>> updatePostingStatus(
                         value = "{\"code\" : \"B019\"}"
                     ),
                 })),
+        @ApiResponse(responseCode = "409", description = "409 Error 실패 케이스",
+            content = @Content(
+                mediaType = "application/json",
+                schema = @Schema(implementation = ErrorResponse.class),
+                examples = {
+                    @ExampleObject(
+                        name = "DELETED 상태의 공고는 내용 수정 불가",
+                        value = "{\"code\" : \"B020\"}"
+                    ),
+                })),
     })
     ResponseEntity<CommonApiResponse<Void>> updatePosting(
         @PathVariable Long postingId,
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/ManagerPostingListResponseDto.java b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/ManagerPostingListResponseDto.java
index 4500f7498..5d169acb5 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/ManagerPostingListResponseDto.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/ManagerPostingListResponseDto.java
@@ -1,9 +1,11 @@
 package com.dreamteam.alter.adapter.inbound.manager.posting.dto;
 
+import com.dreamteam.alter.adapter.inbound.common.dto.DescribedEnumDto;
 import com.dreamteam.alter.adapter.inbound.general.posting.dto.ManagerPostingListWorkspaceResponseDto;
 import com.dreamteam.alter.adapter.inbound.general.posting.dto.PostingScheduleResponseDto;
 import com.dreamteam.alter.adapter.outbound.posting.persistence.readonly.ManagerPostingListResponse;
 import com.dreamteam.alter.domain.posting.type.PaymentType;
+import com.dreamteam.alter.domain.posting.type.PostingStatus;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.NotNull;
@@ -35,6 +37,10 @@ public class ManagerPostingListResponseDto {
     @Schema(description = "급여 타입", example = "HOURLY")
     private PaymentType paymentType;
 
+    @NotNull
+    @Schema(description = "공고 상태")
+    private DescribedEnumDto<PostingStatus> status;
+
     @NotNull
     @Schema(description = "생성일", example = "2023-10-01T12:00:00")
     private LocalDateTime createdAt;
@@ -60,6 +66,7 @@ public static ManagerPostingListResponseDto from(ManagerPostingListResponse resp
             .title(response.getTitle())
             .payAmount(response.getPayAmount())
             .paymentType(response.getPaymentType())
+            .status(DescribedEnumDto.of(response.getStatus(), PostingStatus.describe()))
             .createdAt(response.getCreatedAt())
             .schedules(response.getSchedules().stream()
                 .map(PostingScheduleResponseDto::from)
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingRequestDto.java b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingRequestDto.java
index 5c1af20a8..d67a2d282 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingRequestDto.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingRequestDto.java
@@ -1,8 +1,12 @@
 package com.dreamteam.alter.adapter.inbound.manager.posting.dto;
 
 import java.util.List;
+import java.util.function.Function;
+
+import org.apache.commons.lang3.ObjectUtils;
 
 import com.dreamteam.alter.adapter.inbound.general.posting.dto.CreatePostingScheduleRequestDto;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
 import com.dreamteam.alter.domain.posting.type.PaymentType;
 
 import io.swagger.v3.oas.annotations.media.Schema;
@@ -27,6 +31,7 @@ public class UpdatePostingRequestDto {
     @Schema(description = "공고 제목", example = "홀서빙 구합니다")
     private String title;
 
+    @NotBlank
     @Schema(description = "공고 설명", example = "홀서빙 구합니다. 주말 근무 가능하신 분 우대합니다.")
     private String description;
 
@@ -48,4 +53,20 @@ public class UpdatePostingRequestDto {
 
     @Schema(description = "삭제할 스케줄 ID", example = "[2, 3]")
     private List<Long> deleteScheduleIds;
+
+    public UpdatePostingCommand toCommand() {
+        return new UpdatePostingCommand(
+            title,
+            description,
+            payAmount,
+            paymentType,
+            toCommands(createSchedules, CreatePostingScheduleRequestDto::toCommand),
+            toCommands(updateSchedules, UpdatePostingScheduleDto::toCommand),
+            ObjectUtils.isEmpty(deleteScheduleIds) ? List.of() : deleteScheduleIds
+        );
+    }
+
+    private static <T, R> List<R> toCommands(List<T> source, Function<T, R> mapper) {
+        return ObjectUtils.isEmpty(source) ? List.of() : source.stream().map(mapper).toList();
+    }
 }
diff --git a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingScheduleDto.java b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingScheduleDto.java
index 12b748c95..4e53c1e7e 100644
--- a/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingScheduleDto.java
+++ b/src/main/java/com/dreamteam/alter/adapter/inbound/manager/posting/dto/UpdatePostingScheduleDto.java
@@ -1,10 +1,15 @@
 package com.dreamteam.alter.adapter.inbound.manager.posting.dto;
 
+import com.dreamteam.alter.domain.posting.command.UpdatePostingScheduleCommand;
 import io.swagger.v3.oas.annotations.media.Schema;
 import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotEmpty;
 import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Positive;
 import lombok.*;
 
+import java.time.DayOfWeek;
+import java.time.LocalTime;
 import java.util.List;
 
 @Getter
@@ -18,23 +23,27 @@ public class UpdatePostingScheduleDto {
     @Schema(description = "스케줄 ID", example = "1")
     private Long id;
 
-    @NotNull
+    @NotEmpty
     @Schema(description = "근무일", example = "[\"MONDAY\", \"WEDNESDAY\"]")
-    private List<String> workingDays;
+    private List<DayOfWeek> workingDays;
 
     @NotNull
     @Schema(description = "시작 시간", example = "09:00")
-    private String startTime;
+    private LocalTime startTime;
 
     @NotNull
     @Schema(description = "종료 시간", example = "18:00")
-    private String endTime;
+    private LocalTime endTime;
 
-    @NotNull
+    @Positive
     @Schema(description = "필요 인원", example = "3")
     private int positionsNeeded;
 
     @NotBlank
     @Schema(description = "포지션", example = "홀서빙")
     private String position;
+
+    public UpdatePostingScheduleCommand toCommand() {
+        return new UpdatePostingScheduleCommand(id, workingDays, startTime, endTime, positionsNeeded, position);
+    }
 }
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingQueryRepositoryImpl.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingQueryRepositoryImpl.java
index 8df55887f..debf56edc 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingQueryRepositoryImpl.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingQueryRepositoryImpl.java
@@ -56,6 +56,7 @@ public long getCountOfPostings(PostingListFilterDto filter) {
             .select(qPosting.countDistinct())
             .from(qPosting)
             .leftJoin(qPosting.schedules, qPostingSchedule)
+            .on(qPostingSchedule.status.ne(PostingStatus.DELETED))
             .leftJoin(qPosting.workspace, qWorkspace)
             .where(
                 qPosting.status.eq(PostingStatus.OPEN),
@@ -103,6 +104,7 @@ public List<PostingListResponse> getPostingsWithCursor(CursorPageRequest<CursorD
             .select(qPosting.id)
             .from(qPosting)
             .leftJoin(qPosting.schedules, qPostingSchedule)
+            .on(qPostingSchedule.status.ne(PostingStatus.DELETED))
             .leftJoin(qPosting.workspace, qWorkspace)
             .where(
                 qPosting.status.eq(PostingStatus.OPEN),
@@ -603,7 +605,8 @@ public Optional<ManagerPostingDetailResponse> getManagerPostingDetail(Long posti
             .leftJoin(qWorkspace.businessType, QBusinessType.businessType).fetchJoin()
             .where(
                 qPosting.id.eq(postingId),
-                qWorkspace.managerUser.eq(managerUser)
+                qWorkspace.managerUser.eq(managerUser),
+                qPosting.status.ne(PostingStatus.DELETED)
             )
             .fetchOne();
 
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingScheduleQueryRepositoryImpl.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingScheduleQueryRepositoryImpl.java
index 3d4ad4e11..b3a74d14a 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingScheduleQueryRepositoryImpl.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/PostingScheduleQueryRepositoryImpl.java
@@ -3,6 +3,7 @@
 import com.dreamteam.alter.domain.posting.entity.PostingSchedule;
 import com.dreamteam.alter.domain.posting.entity.QPostingSchedule;
 import com.dreamteam.alter.domain.posting.port.outbound.PostingScheduleQueryRepository;
+import com.dreamteam.alter.domain.posting.type.PostingStatus;
 import com.querydsl.jpa.impl.JPAQueryFactory;
 import lombok.RequiredArgsConstructor;
 import org.apache.commons.lang3.ObjectUtils;
@@ -24,7 +25,8 @@ public Optional<PostingSchedule> findByIdAndPostingId(Long postingId, Long posti
             .from(qPostingSchedule)
             .where(
                 qPostingSchedule.posting.id.eq(postingId),
-                qPostingSchedule.id.eq(postingScheduleId)
+                qPostingSchedule.id.eq(postingScheduleId),
+                qPostingSchedule.status.ne(PostingStatus.DELETED)
             )
             .fetchOne();
 
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingDetailResponse.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingDetailResponse.java
index d4e6052fc..d5eee5b07 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingDetailResponse.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingDetailResponse.java
@@ -48,7 +48,7 @@ public static ManagerPostingDetailResponse of(
             posting.getStatus(),
             posting.getCreatedAt(),
             posting.getUpdatedAt(),
-            posting.getSchedules()
+            posting.getActiveSchedules()
         );
     }
 }
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingListResponse.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingListResponse.java
index 6c06539a9..fe8727e32 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingListResponse.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/ManagerPostingListResponse.java
@@ -3,6 +3,7 @@
 import com.dreamteam.alter.domain.posting.entity.Posting;
 import com.dreamteam.alter.domain.posting.entity.PostingSchedule;
 import com.dreamteam.alter.domain.posting.type.PaymentType;
+import com.dreamteam.alter.domain.posting.type.PostingStatus;
 import com.dreamteam.alter.domain.workspace.entity.Workspace;
 import lombok.*;
 
@@ -23,6 +24,8 @@ public class ManagerPostingListResponse {
 
     private PaymentType paymentType;
 
+    private PostingStatus status;
+
     private LocalDateTime createdAt;
 
     private List<PostingSchedule> schedules;
@@ -35,8 +38,9 @@ public static ManagerPostingListResponse of(Posting posting) {
             .title(posting.getTitle())
             .payAmount(posting.getPayAmount())
             .paymentType(posting.getPaymentType())
+            .status(posting.getStatus())
             .createdAt(posting.getCreatedAt())
-            .schedules(posting.getSchedules())
+            .schedules(posting.getActiveSchedules())
             .workspace(posting.getWorkspace())
             .build();
     }
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingDetailResponse.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingDetailResponse.java
index a1f4f4d69..eb6cf3143 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingDetailResponse.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingDetailResponse.java
@@ -44,7 +44,7 @@ public static PostingDetailResponse of(
             posting.getPayAmount(),
             posting.getPaymentType(),
             posting.getCreatedAt(),
-            posting.getSchedules(),
+            posting.getActiveSchedules(),
             scrapped
         );
     }
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingListResponse.java b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingListResponse.java
index fd4303948..cea8e7c6f 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingListResponse.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/posting/persistence/readonly/PostingListResponse.java
@@ -38,7 +38,7 @@ public static PostingListResponse of(Posting posting, boolean scrapped) {
             .payAmount(posting.getPayAmount())
             .paymentType(posting.getPaymentType())
             .createdAt(posting.getCreatedAt())
-            .schedules(posting.getSchedules())
+            .schedules(posting.getActiveSchedules())
             .workspace(posting.getWorkspace())
             .scrapped(scrapped)
             .build();
diff --git a/src/main/java/com/dreamteam/alter/adapter/outbound/workspace/persistence/WorkspaceQueryRepositoryImpl.java b/src/main/java/com/dreamteam/alter/adapter/outbound/workspace/persistence/WorkspaceQueryRepositoryImpl.java
index 900b7cf25..95449f670 100644
--- a/src/main/java/com/dreamteam/alter/adapter/outbound/workspace/persistence/WorkspaceQueryRepositoryImpl.java
+++ b/src/main/java/com/dreamteam/alter/adapter/outbound/workspace/persistence/WorkspaceQueryRepositoryImpl.java
@@ -64,6 +64,21 @@ public Optional<Workspace> findById(Long id) {
         );
     }
 
+    @Override
+    public Optional<Workspace> findByIdAndManagerUser(Long id, ManagerUser managerUser) {
+        QWorkspace qWorkspace = QWorkspace.workspace;
+        return Optional.ofNullable(
+            queryFactory
+                .selectFrom(qWorkspace)
+                .where(
+                    qWorkspace.id.eq(id),
+                    qWorkspace.managerUser.eq(managerUser),
+                    qWorkspace.status.eq(WorkspaceStatus.ACTIVATED)
+                )
+                .fetchOne()
+        );
+    }
+
     @Override
     public List<ManagerWorkspaceListResponse> getManagerWorkspaceList(ManagerUser managerUser) {
         QWorkspace qWorkspace = QWorkspace.workspace;
diff --git a/src/main/java/com/dreamteam/alter/application/posting/usecase/CreatePosting.java b/src/main/java/com/dreamteam/alter/application/posting/usecase/CreatePosting.java
index c477d58d5..0ab8649cc 100644
--- a/src/main/java/com/dreamteam/alter/application/posting/usecase/CreatePosting.java
+++ b/src/main/java/com/dreamteam/alter/application/posting/usecase/CreatePosting.java
@@ -3,12 +3,13 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import com.dreamteam.alter.adapter.inbound.general.posting.dto.CreatePostingRequestDto;
 import com.dreamteam.alter.common.exception.CustomException;
 import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.CreatePostingCommand;
 import com.dreamteam.alter.domain.posting.entity.Posting;
 import com.dreamteam.alter.domain.posting.port.inbound.CreatePostingUseCase;
 import com.dreamteam.alter.domain.posting.port.outbound.PostingRepository;
+import com.dreamteam.alter.domain.user.context.ManagerActor;
 import com.dreamteam.alter.domain.workspace.entity.Workspace;
 import com.dreamteam.alter.domain.workspace.port.outbound.WorkspaceQueryRepository;
 
@@ -23,11 +24,12 @@ public class CreatePosting implements CreatePostingUseCase {
     private final WorkspaceQueryRepository workspaceQueryRepository;
 
     @Override
-    public void execute(CreatePostingRequestDto request) {
-        Workspace workspace = workspaceQueryRepository.findById(request.getWorkspaceId())
-            .orElseThrow(() -> new CustomException(ErrorCode.WORKSPACE_NOT_FOUND));
+    public void execute(CreatePostingCommand command, ManagerActor actor) {
+        Workspace workspace =
+            workspaceQueryRepository.findByIdAndManagerUser(command.workspaceId(), actor.getManagerUser())
+                .orElseThrow(() -> new CustomException(ErrorCode.WORKSPACE_NOT_FOUND));
 
-        Posting posting = Posting.create(request, workspace);
+        Posting posting = Posting.create(command, workspace);
         postingRepository.save(posting);
     }
 
diff --git a/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePosting.java b/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePosting.java
index fcc24cee8..b935051ea 100644
--- a/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePosting.java
+++ b/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePosting.java
@@ -3,9 +3,9 @@
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
-import com.dreamteam.alter.adapter.inbound.manager.posting.dto.UpdatePostingRequestDto;
 import com.dreamteam.alter.common.exception.CustomException;
 import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
 import com.dreamteam.alter.domain.posting.entity.Posting;
 import com.dreamteam.alter.domain.posting.port.inbound.ManagerUpdatePostingUseCase;
 import com.dreamteam.alter.domain.posting.port.outbound.PostingQueryRepository;
@@ -22,20 +22,12 @@ public class ManagerUpdatePosting implements ManagerUpdatePostingUseCase {
     private final PostingQueryRepository postingQueryRepository;
 
     @Override
-    public void execute(Long postingId, UpdatePostingRequestDto request, ManagerActor actor) {
+    public void execute(Long postingId, UpdatePostingCommand command, ManagerActor actor) {
         ManagerUser managerUser = actor.getManagerUser();
 
         Posting posting = postingQueryRepository.findByManagerAndId(postingId, managerUser)
             .orElseThrow(() -> new CustomException(ErrorCode.POSTING_NOT_FOUND));
 
-        posting.updateContent(
-            request.getTitle(),
-            request.getDescription(),
-            request.getPayAmount(),
-            request.getPaymentType(),
-            request.getCreateSchedules(),
-            request.getUpdateSchedules(),
-            request.getDeleteScheduleIds()
-        );
+        posting.updateContent(command);
     }
 }
diff --git a/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingStatus.java b/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingStatus.java
index 30eee0c54..a4a01c3e8 100644
--- a/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingStatus.java
+++ b/src/main/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingStatus.java
@@ -6,7 +6,6 @@
 import com.dreamteam.alter.domain.posting.entity.Posting;
 import com.dreamteam.alter.domain.posting.port.inbound.ManagerUpdatePostingStatusUseCase;
 import com.dreamteam.alter.domain.posting.port.outbound.PostingQueryRepository;
-import com.dreamteam.alter.domain.posting.type.PostingStatus;
 import com.dreamteam.alter.domain.user.context.ManagerActor;
 import com.dreamteam.alter.domain.user.entity.ManagerUser;
 import lombok.RequiredArgsConstructor;
@@ -27,11 +26,6 @@ public void execute(Long postingId, UpdatePostingStatusRequestDto request, Manag
         Posting posting = postingQueryRepository.findByManagerAndId(postingId, managerUser)
             .orElseThrow(() -> new CustomException(ErrorCode.POSTING_NOT_FOUND));
 
-        // DELETED 상태인 경우 상태 변경 불가
-        if (PostingStatus.DELETED.equals(posting.getStatus())) {
-            throw new CustomException(ErrorCode.CONFLICT);
-        }
-
         posting.updateStatus(request.getStatus());
     }
 }
diff --git a/src/main/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandler.java b/src/main/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandler.java
index cb61ef9ca..c2fbe0d38 100644
--- a/src/main/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandler.java
+++ b/src/main/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandler.java
@@ -10,6 +10,7 @@
 import jakarta.validation.ConstraintViolationException;
 import org.springframework.dao.PessimisticLockingFailureException;
 import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
 import org.springframework.web.bind.MethodArgumentNotValidException;
 import org.springframework.web.bind.MissingServletRequestParameterException;
 import org.springframework.web.bind.annotation.ExceptionHandler;
@@ -83,6 +84,17 @@ public ResponseEntity<ErrorResponse<Void>> handleMethodArgumentTypeMismatchExcep
             .body(ErrorResponse.of(errorCode));
     }
 
+    /**
+     * 요청 본문 역직렬화 실패. 잘못된 JSON 이나 enum · 시각 등 타입 변환 실패가 여기로 온다.
+     * 핸들러가 없으면 Spring 기본 응답이 나가 프로젝트 오류 포맷과 어긋난다.
+     */
+    @ExceptionHandler(HttpMessageNotReadableException.class)
+    public ResponseEntity<ErrorResponse<Void>> handleHttpMessageNotReadableException(HttpMessageNotReadableException e) {
+        ErrorCode errorCode = ErrorCode.ILLEGAL_ARGUMENT;
+        return ResponseEntity.status(errorCode.getStatus())
+            .body(ErrorResponse.of(errorCode, "요청 본문을 해석할 수 없습니다."));
+    }
+
     @ExceptionHandler(MissingServletRequestPartException.class)
     public ResponseEntity<ErrorResponse<Void>> handleMissingServletRequestPartException(MissingServletRequestPartException e) {
         ErrorCode errorCode = ErrorCode.ILLEGAL_ARGUMENT;
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/command/CreatePostingCommand.java b/src/main/java/com/dreamteam/alter/domain/posting/command/CreatePostingCommand.java
new file mode 100644
index 000000000..6a87ebfb1
--- /dev/null
+++ b/src/main/java/com/dreamteam/alter/domain/posting/command/CreatePostingCommand.java
@@ -0,0 +1,14 @@
+package com.dreamteam.alter.domain.posting.command;
+
+import com.dreamteam.alter.domain.posting.type.PaymentType;
+
+import java.util.List;
+
+public record CreatePostingCommand(
+    Long workspaceId,
+    String title,
+    String description,
+    int payAmount,
+    PaymentType paymentType,
+    List<PostingScheduleCommand> schedules
+) {}
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/command/PostingScheduleCommand.java b/src/main/java/com/dreamteam/alter/domain/posting/command/PostingScheduleCommand.java
new file mode 100644
index 000000000..beeead2dd
--- /dev/null
+++ b/src/main/java/com/dreamteam/alter/domain/posting/command/PostingScheduleCommand.java
@@ -0,0 +1,13 @@
+package com.dreamteam.alter.domain.posting.command;
+
+import java.time.DayOfWeek;
+import java.time.LocalTime;
+import java.util.List;
+
+public record PostingScheduleCommand(
+    List<DayOfWeek> workingDays,
+    LocalTime startTime,
+    LocalTime endTime,
+    int positionsNeeded,
+    String position
+) {}
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingCommand.java b/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingCommand.java
new file mode 100644
index 000000000..cb4ecdb6e
--- /dev/null
+++ b/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingCommand.java
@@ -0,0 +1,15 @@
+package com.dreamteam.alter.domain.posting.command;
+
+import com.dreamteam.alter.domain.posting.type.PaymentType;
+
+import java.util.List;
+
+public record UpdatePostingCommand(
+    String title,
+    String description,
+    int payAmount,
+    PaymentType paymentType,
+    List<PostingScheduleCommand> createSchedules,
+    List<UpdatePostingScheduleCommand> updateSchedules,
+    List<Long> deleteScheduleIds
+) {}
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingScheduleCommand.java b/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingScheduleCommand.java
new file mode 100644
index 000000000..73d85affb
--- /dev/null
+++ b/src/main/java/com/dreamteam/alter/domain/posting/command/UpdatePostingScheduleCommand.java
@@ -0,0 +1,14 @@
+package com.dreamteam.alter.domain.posting.command;
+
+import java.time.DayOfWeek;
+import java.time.LocalTime;
+import java.util.List;
+
+public record UpdatePostingScheduleCommand(
+    Long id,
+    List<DayOfWeek> workingDays,
+    LocalTime startTime,
+    LocalTime endTime,
+    int positionsNeeded,
+    String position
+) {}
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/entity/Posting.java b/src/main/java/com/dreamteam/alter/domain/posting/entity/Posting.java
index 62ab54710..c278b3895 100644
--- a/src/main/java/com/dreamteam/alter/domain/posting/entity/Posting.java
+++ b/src/main/java/com/dreamteam/alter/domain/posting/entity/Posting.java
@@ -1,16 +1,15 @@
 package com.dreamteam.alter.domain.posting.entity;
 
-import com.dreamteam.alter.adapter.inbound.general.posting.dto.CreatePostingRequestDto;
-import com.dreamteam.alter.adapter.inbound.general.posting.dto.CreatePostingScheduleRequestDto;
-import com.dreamteam.alter.adapter.inbound.manager.posting.dto.UpdatePostingScheduleDto;
 import com.dreamteam.alter.common.exception.CustomException;
 import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.CreatePostingCommand;
+import com.dreamteam.alter.domain.posting.command.PostingScheduleCommand;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingScheduleCommand;
 import com.dreamteam.alter.domain.posting.type.PaymentType;
 import com.dreamteam.alter.domain.posting.type.PostingStatus;
 import com.dreamteam.alter.domain.workspace.entity.Workspace;
 
-import java.time.DayOfWeek;
-import java.time.LocalTime;
 import jakarta.persistence.*;
 import lombok.*;
 import org.apache.commons.lang3.ObjectUtils;
@@ -19,6 +18,7 @@
 import org.springframework.data.jpa.domain.support.AuditingEntityListener;
 
 import java.time.LocalDateTime;
+import java.util.ArrayList;
 import java.util.List;
 
 @Entity
@@ -67,76 +67,78 @@ public class Posting {
     @OneToMany(mappedBy = "posting", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<PostingSchedule> schedules;
 
-    public static Posting create(CreatePostingRequestDto request, Workspace workspace) {
+    public static Posting create(CreatePostingCommand command, Workspace workspace) {
         Posting posting = Posting.builder()
             .workspace(workspace)
-            .title(request.getTitle())
-            .description(request.getDescription())
-            .payAmount(request.getPayAmount())
-            .paymentType(request.getPaymentType())
+            .title(command.title())
+            .description(command.description())
+            .payAmount(command.payAmount())
+            .paymentType(command.paymentType())
             .status(PostingStatus.OPEN)
             .build();
 
-        if (ObjectUtils.isNotEmpty(request.getSchedules())) {
-            posting.schedules = request.getSchedules()
-                .stream()
-                .map(scheduleDto -> PostingSchedule.create(
-                    scheduleDto.getWorkingDays(),
-                    scheduleDto.getStartTime(),
-                    scheduleDto.getEndTime(),
-                    scheduleDto.getPositionsNeeded(),
-                    scheduleDto.getPosition(),
-                    posting
-                ))
-                .toList();
+        posting.schedules = new ArrayList<>();
+        if (ObjectUtils.isNotEmpty(command.schedules())) {
+            posting.addSchedules(command.schedules());
         }
 
         return posting;
     }
 
     public void updateStatus(PostingStatus status) {
+        validateModifiable();
+
         this.status = status;
     }
 
-    public void updateContent(
-        String title,
-        String description,
-        int payAmount,
-        PaymentType paymentType,
-        List<CreatePostingScheduleRequestDto> createSchedules,
-        List<UpdatePostingScheduleDto> updateSchedules,
-        List<Long> deleteScheduleIds
-    ) {
-        this.title = title;
-        this.description = description;
-        this.payAmount = payAmount;
-        this.paymentType = paymentType;
+    /**
+     * 삭제되지 않은 근무일정만 반환한다. (응답 노출 기준)
+     */
+    public List<PostingSchedule> getActiveSchedules() {
+        if (ObjectUtils.isEmpty(this.schedules)) {
+            return List.of();
+        }
+
+        return this.schedules.stream()
+            .filter(schedule -> !PostingStatus.DELETED.equals(schedule.getStatus()))
+            .toList();
+    }
+
+    public void updateContent(UpdatePostingCommand command) {
+        validateModifiable();
+
+        this.title = command.title();
+        this.description = command.description();
+        this.payAmount = command.payAmount();
+        this.paymentType = command.paymentType();
 
         // 스케줄 삭제 처리
-        if (ObjectUtils.isNotEmpty(deleteScheduleIds))
-            deleteSchedules(deleteScheduleIds);
+        if (ObjectUtils.isNotEmpty(command.deleteScheduleIds()))
+            deleteSchedules(command.deleteScheduleIds());
 
         // 스케줄 수정 처리
-        if (ObjectUtils.isNotEmpty(updateSchedules))
-            updateSchedules(updateSchedules);
+        if (ObjectUtils.isNotEmpty(command.updateSchedules()))
+            updateSchedules(command.updateSchedules());
 
         // 스케줄 추가 처리
-        if (ObjectUtils.isNotEmpty(createSchedules))
-            addSchedules(createSchedules);
+        if (ObjectUtils.isNotEmpty(command.createSchedules()))
+            addSchedules(command.createSchedules());
+
+        closeIfNoActiveSchedules();
     }
 
     /**
      * 스케줄 추가
      * @param createSchedules 스케줄 추가 정보 List
      */
-    public void addSchedules(List<CreatePostingScheduleRequestDto> createSchedules) {
-        for (CreatePostingScheduleRequestDto createDto : createSchedules) {
+    public void addSchedules(List<PostingScheduleCommand> createSchedules) {
+        for (PostingScheduleCommand createCommand : createSchedules) {
             PostingSchedule newSchedule = PostingSchedule.create(
-                createDto.getWorkingDays(),
-                createDto.getStartTime(),
-                createDto.getEndTime(),
-                createDto.getPositionsNeeded(),
-                createDto.getPosition(),
+                createCommand.workingDays(),
+                createCommand.startTime(),
+                createCommand.endTime(),
+                createCommand.positionsNeeded(),
+                createCommand.position(),
                 this
             );
             this.schedules.add(newSchedule);
@@ -147,21 +149,19 @@ public void addSchedules(List<CreatePostingScheduleRequestDto> createSchedules)
      * 스케줄 수정
      * @param updateSchedules 스케줄 수정 정보 List
      */
-    public void updateSchedules(List<UpdatePostingScheduleDto> updateSchedules) {
-        for (UpdatePostingScheduleDto updateDto : updateSchedules) {
-            PostingSchedule existingSchedule = this.schedules.stream()
-                .filter(schedule -> schedule.getId().equals(updateDto.getId()))
+    public void updateSchedules(List<UpdatePostingScheduleCommand> updateSchedules) {
+        for (UpdatePostingScheduleCommand updateCommand : updateSchedules) {
+            PostingSchedule existingSchedule = getActiveSchedules().stream()
+                .filter(schedule -> schedule.getId().equals(updateCommand.id()))
                 .findFirst()
                 .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND, "수정할 스케줄을 찾을 수 없습니다."));
 
             existingSchedule.update(
-                updateDto.getWorkingDays().stream()
-                    .map(DayOfWeek::valueOf)
-                    .toList(),
-                LocalTime.parse(updateDto.getStartTime()),
-                LocalTime.parse(updateDto.getEndTime()),
-                updateDto.getPositionsNeeded(),
-                updateDto.getPosition()
+                updateCommand.workingDays(),
+                updateCommand.startTime(),
+                updateCommand.endTime(),
+                updateCommand.positionsNeeded(),
+                updateCommand.position()
             );
         }
     }
@@ -172,7 +172,7 @@ public void updateSchedules(List<UpdatePostingScheduleDto> updateSchedules) {
      */
     public void deleteSchedules(List<Long> deleteScheduleIds) {
         for (Long scheduleId : deleteScheduleIds) {
-            PostingSchedule existingSchedule = this.schedules.stream()
+            PostingSchedule existingSchedule = getActiveSchedules().stream()
                 .filter(schedule -> schedule.getId().equals(scheduleId))
                 .findFirst()
                 .orElseThrow(() -> new CustomException(ErrorCode.NOT_FOUND, "삭제할 스케줄을 찾을 수 없습니다."));
@@ -180,4 +180,23 @@ public void deleteSchedules(List<Long> deleteScheduleIds) {
             existingSchedule.updateStatus(PostingStatus.DELETED);
         }
     }
+
+    /**
+     * 삭제된 공고는 더 이상 변경할 수 없다.
+     */
+    private void validateModifiable() {
+        if (PostingStatus.DELETED.equals(this.status)) {
+            throw new CustomException(ErrorCode.CONFLICT);
+        }
+    }
+
+    /**
+     * 모집할 근무일정이 하나도 남지 않으면 마감된 공고로 본다.
+     * 삭제·수정·추가를 모두 마친 뒤에 판정해야 전부 지우고 새로 추가하는 요청을 마감으로 잘못 처리하지 않는다.
+     */
+    private void closeIfNoActiveSchedules() {
+        if (PostingStatus.OPEN.equals(this.status) && getActiveSchedules().isEmpty()) {
+            this.status = PostingStatus.CLOSED;
+        }
+    }
 }
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/CreatePostingUseCase.java b/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/CreatePostingUseCase.java
index e47a8abdb..88deed4ff 100644
--- a/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/CreatePostingUseCase.java
+++ b/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/CreatePostingUseCase.java
@@ -1,7 +1,8 @@
 package com.dreamteam.alter.domain.posting.port.inbound;
 
-import com.dreamteam.alter.adapter.inbound.general.posting.dto.CreatePostingRequestDto;
+import com.dreamteam.alter.domain.posting.command.CreatePostingCommand;
+import com.dreamteam.alter.domain.user.context.ManagerActor;
 
 public interface CreatePostingUseCase {
-    void execute(CreatePostingRequestDto request);
+    void execute(CreatePostingCommand command, ManagerActor actor);
 }
diff --git a/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/ManagerUpdatePostingUseCase.java b/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/ManagerUpdatePostingUseCase.java
index 147f7d285..005084a3d 100644
--- a/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/ManagerUpdatePostingUseCase.java
+++ b/src/main/java/com/dreamteam/alter/domain/posting/port/inbound/ManagerUpdatePostingUseCase.java
@@ -1,8 +1,8 @@
 package com.dreamteam.alter.domain.posting.port.inbound;
 
-import com.dreamteam.alter.adapter.inbound.manager.posting.dto.UpdatePostingRequestDto;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
 import com.dreamteam.alter.domain.user.context.ManagerActor;
 
 public interface ManagerUpdatePostingUseCase {
-    void execute(Long postingId, UpdatePostingRequestDto request, ManagerActor actor);
+    void execute(Long postingId, UpdatePostingCommand command, ManagerActor actor);
 }
diff --git a/src/main/java/com/dreamteam/alter/domain/workspace/port/outbound/WorkspaceQueryRepository.java b/src/main/java/com/dreamteam/alter/domain/workspace/port/outbound/WorkspaceQueryRepository.java
index e65676357..a8a36bf2a 100644
--- a/src/main/java/com/dreamteam/alter/domain/workspace/port/outbound/WorkspaceQueryRepository.java
+++ b/src/main/java/com/dreamteam/alter/domain/workspace/port/outbound/WorkspaceQueryRepository.java
@@ -20,6 +20,7 @@
 
 public interface WorkspaceQueryRepository {
     Optional<Workspace> findById(Long id);
+    Optional<Workspace> findByIdAndManagerUser(Long id, ManagerUser managerUser);
     List<ManagerWorkspaceListResponse> getManagerWorkspaceList(ManagerUser managerUser);
 
     ManagerWorkspaceResponse getByManagerUserAndId(ManagerUser managerUser, Long workspaceId);
diff --git a/src/main/resources/db/migration/V4__unify_chat_schema.sql b/src/main/resources/db/migration/V11__unify_chat_schema.sql
similarity index 100%
rename from src/main/resources/db/migration/V4__unify_chat_schema.sql
rename to src/main/resources/db/migration/V11__unify_chat_schema.sql
diff --git a/src/main/resources/db/migration/V5__chat_message_content_nullable.sql b/src/main/resources/db/migration/V12__chat_message_content_nullable.sql
similarity index 100%
rename from src/main/resources/db/migration/V5__chat_message_content_nullable.sql
rename to src/main/resources/db/migration/V12__chat_message_content_nullable.sql
diff --git a/src/main/resources/db/migration/V6__backfill_workspace_group_chat.sql b/src/main/resources/db/migration/V13__backfill_workspace_group_chat.sql
similarity index 100%
rename from src/main/resources/db/migration/V6__backfill_workspace_group_chat.sql
rename to src/main/resources/db/migration/V13__backfill_workspace_group_chat.sql
diff --git a/src/main/resources/db/migration/V7__unique_workspace_group_chat_room.sql b/src/main/resources/db/migration/V14__unique_workspace_group_chat_room.sql
similarity index 100%
rename from src/main/resources/db/migration/V7__unique_workspace_group_chat_room.sql
rename to src/main/resources/db/migration/V14__unique_workspace_group_chat_room.sql
diff --git a/src/test/java/com/dreamteam/alter/application/posting/usecase/CreatePostingTests.java b/src/test/java/com/dreamteam/alter/application/posting/usecase/CreatePostingTests.java
new file mode 100644
index 000000000..32dd21f97
--- /dev/null
+++ b/src/test/java/com/dreamteam/alter/application/posting/usecase/CreatePostingTests.java
@@ -0,0 +1,110 @@
+package com.dreamteam.alter.application.posting.usecase;
+
+import com.dreamteam.alter.common.exception.CustomException;
+import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.CreatePostingCommand;
+import com.dreamteam.alter.domain.posting.command.PostingScheduleCommand;
+import com.dreamteam.alter.domain.posting.entity.Posting;
+import com.dreamteam.alter.domain.posting.port.outbound.PostingRepository;
+import com.dreamteam.alter.domain.posting.type.PaymentType;
+import com.dreamteam.alter.domain.posting.type.PostingStatus;
+import com.dreamteam.alter.domain.user.context.ManagerActor;
+import com.dreamteam.alter.domain.user.entity.ManagerUser;
+import com.dreamteam.alter.domain.workspace.entity.Workspace;
+import com.dreamteam.alter.domain.workspace.port.outbound.WorkspaceQueryRepository;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.time.DayOfWeek;
+import java.time.LocalTime;
+import java.util.List;
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.BDDMockito.then;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.never;
+
+@ExtendWith(MockitoExtension.class)
+@DisplayName("CreatePosting 테스트")
+class CreatePostingTests {
+
+    @Mock
+    private PostingRepository postingRepository;
+
+    @Mock
+    private WorkspaceQueryRepository workspaceQueryRepository;
+
+    @InjectMocks
+    private CreatePosting createPosting;
+
+    @Test
+    @DisplayName("자신이 관리하는 업장이 아니면 WORKSPACE_NOT_FOUND 예외가 발생한다")
+    void execute_타매니저업장_예외발생() {
+        // given
+        ManagerActor actor = mock(ManagerActor.class);
+        ManagerUser managerUser = mock(ManagerUser.class);
+
+        given(actor.getManagerUser()).willReturn(managerUser);
+        given(workspaceQueryRepository.findByIdAndManagerUser(1L, managerUser)).willReturn(Optional.empty());
+
+        // when & then
+        assertThatThrownBy(() -> createPosting.execute(command(), actor))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.WORKSPACE_NOT_FOUND));
+        then(postingRepository).should(never()).save(any());
+    }
+
+    @Test
+    @DisplayName("자신이 관리하는 업장이면 공고가 OPEN 상태로 근무일정과 함께 저장된다")
+    void execute_소유업장_공고저장() {
+        // given
+        ManagerActor actor = mock(ManagerActor.class);
+        ManagerUser managerUser = mock(ManagerUser.class);
+        Workspace workspace = mock(Workspace.class);
+
+        given(actor.getManagerUser()).willReturn(managerUser);
+        given(workspaceQueryRepository.findByIdAndManagerUser(1L, managerUser)).willReturn(Optional.of(workspace));
+
+        // when
+        createPosting.execute(command(), actor);
+
+        // then
+        ArgumentCaptor<Posting> captor = ArgumentCaptor.forClass(Posting.class);
+        then(postingRepository).should().save(captor.capture());
+
+        Posting saved = captor.getValue();
+        assertThat(saved.getTitle()).isEqualTo("홀서빙 구합니다");
+        assertThat(saved.getWorkspace()).isSameAs(workspace);
+        assertThat(saved.getStatus()).isEqualTo(PostingStatus.OPEN);
+        assertThat(saved.getPaymentType()).isEqualTo(PaymentType.HOURLY);
+        assertThat(saved.getSchedules()).hasSize(1);
+        assertThat(saved.getSchedules().getFirst().getPosition()).isEqualTo("홀서빙");
+        assertThat(saved.getSchedules().getFirst().getPositionsAvailable()).isEqualTo(3);
+    }
+
+    private CreatePostingCommand command() {
+        return new CreatePostingCommand(
+            1L,
+            "홀서빙 구합니다",
+            "주말 근무 가능하신 분",
+            12000,
+            PaymentType.HOURLY,
+            List.of(new PostingScheduleCommand(
+                List.of(DayOfWeek.MONDAY),
+                LocalTime.of(9, 0),
+                LocalTime.of(18, 0),
+                3,
+                "홀서빙"
+            ))
+        );
+    }
+}
diff --git a/src/test/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingTests.java b/src/test/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingTests.java
new file mode 100644
index 000000000..15443d33c
--- /dev/null
+++ b/src/test/java/com/dreamteam/alter/application/posting/usecase/ManagerUpdatePostingTests.java
@@ -0,0 +1,82 @@
+package com.dreamteam.alter.application.posting.usecase;
+
+import com.dreamteam.alter.common.exception.CustomException;
+import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
+import com.dreamteam.alter.domain.posting.entity.Posting;
+import com.dreamteam.alter.domain.posting.port.outbound.PostingQueryRepository;
+import com.dreamteam.alter.domain.posting.type.PaymentType;
+import com.dreamteam.alter.domain.user.context.ManagerActor;
+import com.dreamteam.alter.domain.user.entity.ManagerUser;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+
+import java.util.List;
+import java.util.Optional;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.BDDMockito.then;
+import static org.mockito.Mockito.mock;
+
+@ExtendWith(MockitoExtension.class)
+@DisplayName("ManagerUpdatePosting 테스트")
+class ManagerUpdatePostingTests {
+
+    @Mock
+    private PostingQueryRepository postingQueryRepository;
+
+    @InjectMocks
+    private ManagerUpdatePosting managerUpdatePosting;
+
+    @Test
+    @DisplayName("존재하지 않거나 자신의 공고가 아니면 POSTING_NOT_FOUND 예외가 발생한다")
+    void execute_공고없음_예외발생() {
+        // given
+        ManagerActor actor = mock(ManagerActor.class);
+        ManagerUser managerUser = mock(ManagerUser.class);
+        given(actor.getManagerUser()).willReturn(managerUser);
+        given(postingQueryRepository.findByManagerAndId(1L, managerUser)).willReturn(Optional.empty());
+
+        // when & then
+        assertThatThrownBy(() -> managerUpdatePosting.execute(1L, command(), actor))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.POSTING_NOT_FOUND));
+    }
+
+    @Test
+    @DisplayName("조회한 공고에 수정 명령을 그대로 위임한다")
+    void execute_정상공고_수정() {
+        // given
+        ManagerActor actor = mock(ManagerActor.class);
+        ManagerUser managerUser = mock(ManagerUser.class);
+        Posting posting = mock(Posting.class);
+        UpdatePostingCommand command = command();
+
+        given(actor.getManagerUser()).willReturn(managerUser);
+        given(postingQueryRepository.findByManagerAndId(1L, managerUser)).willReturn(Optional.of(posting));
+
+        // when
+        managerUpdatePosting.execute(1L, command, actor);
+
+        // then
+        then(posting).should().updateContent(command);
+    }
+
+    private UpdatePostingCommand command() {
+        return new UpdatePostingCommand(
+            "수정된 제목",
+            "수정된 설명",
+            13000,
+            PaymentType.HOURLY,
+            List.of(),
+            List.of(),
+            List.of()
+        );
+    }
+}
diff --git a/src/test/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandlerTests.java b/src/test/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandlerTests.java
new file mode 100644
index 000000000..9a616df93
--- /dev/null
+++ b/src/test/java/com/dreamteam/alter/common/exception/handler/GlobalExceptionHandlerTests.java
@@ -0,0 +1,61 @@
+package com.dreamteam.alter.common.exception.handler;
+
+import com.dreamteam.alter.adapter.inbound.manager.posting.dto.UpdatePostingScheduleDto;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RestController;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@DisplayName("GlobalExceptionHandler 테스트")
+class GlobalExceptionHandlerTests {
+
+    private MockMvc mockMvc;
+
+    @BeforeEach
+    void setUp() {
+        mockMvc = MockMvcBuilders.standaloneSetup(new TestController())
+            .setControllerAdvice(new GlobalExceptionHandler())
+            .build();
+    }
+
+    @Test
+    @DisplayName("요일 값이 잘못되면 프로젝트 오류 포맷으로 400을 반환한다")
+    void 잘못된_요일값_400() throws Exception {
+        String body = """
+            {"id": 1, "workingDays": ["monday"], "startTime": "09:00", "endTime": "18:00", "positionsNeeded": 1, "position": "홀서빙"}
+            """;
+
+        mockMvc.perform(post("/test").contentType(MediaType.APPLICATION_JSON).content(body))
+            .andExpect(status().isBadRequest())
+            .andExpect(jsonPath("$.code").value("B001"));
+    }
+
+    @Test
+    @DisplayName("시각 값이 잘못되면 프로젝트 오류 포맷으로 400을 반환한다")
+    void 잘못된_시각값_400() throws Exception {
+        String body = """
+            {"id": 1, "workingDays": ["MONDAY"], "startTime": "25:00", "endTime": "18:00", "positionsNeeded": 1, "position": "홀서빙"}
+            """;
+
+        mockMvc.perform(post("/test").contentType(MediaType.APPLICATION_JSON).content(body))
+            .andExpect(status().isBadRequest())
+            .andExpect(jsonPath("$.code").value("B001"));
+    }
+
+    @RestController
+    static class TestController {
+
+        @PostMapping("/test")
+        void receive(@RequestBody UpdatePostingScheduleDto request) {
+        }
+    }
+}
diff --git a/src/test/java/com/dreamteam/alter/domain/posting/entity/PostingTests.java b/src/test/java/com/dreamteam/alter/domain/posting/entity/PostingTests.java
new file mode 100644
index 000000000..0e98aa458
--- /dev/null
+++ b/src/test/java/com/dreamteam/alter/domain/posting/entity/PostingTests.java
@@ -0,0 +1,217 @@
+package com.dreamteam.alter.domain.posting.entity;
+
+import com.dreamteam.alter.common.exception.CustomException;
+import com.dreamteam.alter.common.exception.ErrorCode;
+import com.dreamteam.alter.domain.posting.command.PostingScheduleCommand;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingCommand;
+import com.dreamteam.alter.domain.posting.command.UpdatePostingScheduleCommand;
+import com.dreamteam.alter.domain.posting.type.PaymentType;
+import com.dreamteam.alter.domain.posting.type.PostingStatus;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.util.ReflectionTestUtils;
+
+import java.time.DayOfWeek;
+import java.time.LocalTime;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@DisplayName("Posting 테스트")
+class PostingTests {
+
+    @Test
+    @DisplayName("삭제된 근무일정은 활성 일정 목록에서 제외된다")
+    void getActiveSchedules_삭제일정제외() {
+        // given
+        Posting posting = new Posting();
+        PostingSchedule open = createSchedule(posting, "홀서빙");
+        PostingSchedule deleted = createSchedule(posting, "주방보조");
+        deleted.updateStatus(PostingStatus.DELETED);
+        ReflectionTestUtils.setField(posting, "schedules", List.of(open, deleted));
+
+        // when
+        List<PostingSchedule> result = posting.getActiveSchedules();
+
+        // then
+        assertThat(result).containsExactly(open);
+    }
+
+    @Test
+    @DisplayName("근무일정이 없으면 빈 목록을 반환한다")
+    void getActiveSchedules_일정없음_빈목록() {
+        // given
+        Posting posting = new Posting();
+
+        // when & then
+        assertThat(posting.getActiveSchedules()).isEmpty();
+    }
+
+    @Test
+    @DisplayName("삭제된 근무일정은 수정할 수 없다")
+    void updateSchedules_삭제일정_예외발생() {
+        // given
+        Posting posting = new Posting();
+        PostingSchedule deleted = createSchedule(posting, 1L, "주방보조");
+        deleted.updateStatus(PostingStatus.DELETED);
+        ReflectionTestUtils.setField(posting, "schedules", List.of(deleted));
+
+        UpdatePostingScheduleCommand command = new UpdatePostingScheduleCommand(
+            1L,
+            List.of(DayOfWeek.TUESDAY),
+            LocalTime.of(10, 0),
+            LocalTime.of(19, 0),
+            5,
+            "홀서빙"
+        );
+
+        // when & then
+        assertThatThrownBy(() -> posting.updateSchedules(List.of(command)))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.NOT_FOUND));
+        assertThat(deleted.getPosition()).isEqualTo("주방보조");
+        assertThat(deleted.getPositionsAvailable()).isEqualTo(1);
+    }
+
+    @Test
+    @DisplayName("이미 삭제된 근무일정은 다시 삭제할 수 없다")
+    void deleteSchedules_삭제일정_예외발생() {
+        // given
+        Posting posting = new Posting();
+        PostingSchedule deleted = createSchedule(posting, 1L, "주방보조");
+        deleted.updateStatus(PostingStatus.DELETED);
+        ReflectionTestUtils.setField(posting, "schedules", List.of(deleted));
+
+        // when & then
+        assertThatThrownBy(() -> posting.deleteSchedules(List.of(1L)))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.NOT_FOUND));
+    }
+
+    @Test
+    @DisplayName("마지막 근무일정을 삭제하면 공고가 모집 완료로 바뀐다")
+    void updateContent_마지막일정삭제_자동종료() {
+        // given
+        Posting posting = openPosting();
+        PostingSchedule only = createSchedule(posting, 1L, "홀서빙");
+        ReflectionTestUtils.setField(posting, "schedules", new ArrayList<>(List.of(only)));
+
+        // when
+        posting.updateContent(updateCommand(null, null, List.of(1L)));
+
+        // then
+        assertThat(posting.getActiveSchedules()).isEmpty();
+        assertThat(posting.getStatus()).isEqualTo(PostingStatus.CLOSED);
+    }
+
+    @Test
+    @DisplayName("근무일정을 전부 삭제하고 새로 추가하면 모집 중을 유지한다")
+    void updateContent_전부삭제후추가_모집중유지() {
+        // given
+        Posting posting = openPosting();
+        PostingSchedule only = createSchedule(posting, 1L, "홀서빙");
+        ReflectionTestUtils.setField(posting, "schedules", new ArrayList<>(List.of(only)));
+
+        PostingScheduleCommand created = new PostingScheduleCommand(
+            List.of(DayOfWeek.FRIDAY),
+            LocalTime.of(13, 0),
+            LocalTime.of(21, 0),
+            2,
+            "주방보조"
+        );
+
+        // when
+        posting.updateContent(updateCommand(List.of(created), null, List.of(1L)));
+
+        // then
+        assertThat(posting.getActiveSchedules()).hasSize(1);
+        assertThat(posting.getStatus()).isEqualTo(PostingStatus.OPEN);
+    }
+
+    @Test
+    @DisplayName("근무일정이 남아 있으면 모집 중을 유지한다")
+    void updateContent_일부일정삭제_모집중유지() {
+        // given
+        Posting posting = openPosting();
+        PostingSchedule first = createSchedule(posting, 1L, "홀서빙");
+        PostingSchedule second = createSchedule(posting, 2L, "주방보조");
+        ReflectionTestUtils.setField(posting, "schedules", new ArrayList<>(List.of(first, second)));
+
+        // when
+        posting.updateContent(updateCommand(null, null, List.of(1L)));
+
+        // then
+        assertThat(posting.getActiveSchedules()).containsExactly(second);
+        assertThat(posting.getStatus()).isEqualTo(PostingStatus.OPEN);
+    }
+
+    @Test
+    @DisplayName("삭제된 공고는 내용을 수정할 수 없다")
+    void updateContent_삭제공고_예외발생() {
+        // given
+        Posting posting = new Posting();
+        ReflectionTestUtils.setField(posting, "status", PostingStatus.DELETED);
+        ReflectionTestUtils.setField(posting, "title", "원래 제목");
+
+        // when & then
+        assertThatThrownBy(() -> posting.updateContent(updateCommand(null, null, null)))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.CONFLICT));
+        assertThat(posting.getTitle()).isEqualTo("원래 제목");
+    }
+
+    @Test
+    @DisplayName("삭제된 공고는 상태를 변경할 수 없다")
+    void updateStatus_삭제공고_예외발생() {
+        // given
+        Posting posting = new Posting();
+        ReflectionTestUtils.setField(posting, "status", PostingStatus.DELETED);
+
+        // when & then
+        assertThatThrownBy(() -> posting.updateStatus(PostingStatus.OPEN))
+            .isInstanceOf(CustomException.class)
+            .satisfies(ex -> assertThat(((CustomException) ex).getErrorCode()).isEqualTo(ErrorCode.CONFLICT));
+        assertThat(posting.getStatus()).isEqualTo(PostingStatus.DELETED);
+    }
+
+    private Posting openPosting() {
+        Posting posting = new Posting();
+        ReflectionTestUtils.setField(posting, "status", PostingStatus.OPEN);
+        return posting;
+    }
+
+    private UpdatePostingCommand updateCommand(
+        List<PostingScheduleCommand> createSchedules,
+        List<UpdatePostingScheduleCommand> updateSchedules,
+        List<Long> deleteScheduleIds
+    ) {
+        return new UpdatePostingCommand(
+            "제목",
+            "설명",
+            12000,
+            PaymentType.HOURLY,
+            createSchedules,
+            updateSchedules,
+            deleteScheduleIds
+        );
+    }
+
+    private PostingSchedule createSchedule(Posting posting, String position) {
+        return PostingSchedule.create(
+            List.of(DayOfWeek.MONDAY),
+            LocalTime.of(9, 0),
+            LocalTime.of(18, 0),
+            1,
+            position,
+            posting
+        );
+    }
+
+    private PostingSchedule createSchedule(Posting posting, Long id, String position) {
+        PostingSchedule schedule = createSchedule(posting, position);
+        ReflectionTestUtils.setField(schedule, "id", id);
+        return schedule;
+    }
+}