diff --git a/.github/workflows/merge.yaml b/.github/workflows/merge.yaml
index 9e3ee141..ab6973ad 100644
--- a/.github/workflows/merge.yaml
+++ b/.github/workflows/merge.yaml
@@ -30,3 +30,48 @@ jobs:
     with:
       doc_target: "utilities_cxx_api"
     secrets: inherit
+
+  platform_matrix:
+    uses: NWChemEx/.github/.github/workflows/platform_matrix.yaml@master
+
+  build_pypi_dist:
+    needs: [tag-commit, platform_matrix]
+    strategy:
+      fail-fast: false
+      matrix:
+        include: ${{ fromJSON(needs.platform_matrix.outputs.release_matrix) }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Build PyPI Distribution
+        uses: NWChemEx/.github/.github/actions/build_pypi_dist@master
+        with:
+          cibw_build: ${{ matrix.cibw_build }}
+          build_sdist: ${{ matrix.os == 'ubuntu-latest' && 'true' || 'false' }}
+
+      - name: Upload Distribution Artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: dist-${{ matrix.os }}
+          path: dist/
+
+  # A separate, ubuntu-only publish job (rather than a publish step per
+  # build_pypi_dist leg) because pypa/gh-action-pypi-publish only runs on
+  # Linux, and because PyPI trusted publishing does not support reusable
+  # workflows (this job must be defined directly here, not delegated).
+  deploy_to_pypi:
+    needs: build_pypi_dist
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+    steps:
+      - name: Download All Distributions
+        uses: actions/download-artifact@v4
+        with:
+          pattern: dist-*
+          path: dist
+          merge-multiple: true
+
+      - name: Publish to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          packages-dir: dist/
diff --git a/.github/workflows/nightly.yaml b/.github/workflows/nightly.yaml
index 13a475e6..1ba6e517 100644
--- a/.github/workflows/nightly.yaml
+++ b/.github/workflows/nightly.yaml
@@ -14,13 +14,23 @@
 #
 
 name: Nightly Workflow
+# Re-runs the same build/test jobs pull_request.yaml runs, on a schedule, to
+# catch breakage that originates outside the repo (upstream dependency
+# releases, refreshed GitHub runner images) rather than from a code change.
+# Keep the job list below in sync with pull_request.yaml.
 
 on:
   schedule:
     - cron: "0 6 * * *" # Every day at 06:00 UTC (00:00 CST)
 
 jobs:
-  test_library:
-    uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
+  test_cmake_build:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_cmake_build.yaml@master
     with:
-      compilers: '["gcc-14", "clang-18"]'
+      run_python_tests: "false"
+
+  test_pip_build:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_pip_build.yaml@master
+    with:
+      run_python_tests: "false"
+      run_cmake_tests: "false"
diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index dc0b00c0..7dc1c360 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -29,7 +29,13 @@ jobs:
     with:
       doc_target: "utilities_cxx_api"
 
-  test_library:
-    uses: NWChemEx/.github/.github/workflows/test_nwx_library.yaml@master
+  test_cmake_build:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_cmake_build.yaml@master
     with:
-      compilers: '["gcc-14", "clang-18"]'
+      run_python_tests: "false"
+
+  test_pip_build:
+    uses: NWChemEx/.github/.github/workflows/test_nwx_pip_build.yaml@master
+    with:
+      run_python_tests: "false"
+      run_cmake_tests: "false"
diff --git a/.gitignore b/.gitignore
index 803d6f08..204f627b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -46,3 +46,9 @@ install/
 
 # Users commonly store their specific CMake settings in a toolchain file
 toolchain.cmake
+
+# These are MacOS files
+.DS_Store
+
+# Automatically installed in dev mode
+.pre-commit-config.yaml
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0cc453f9..7ccfbd40 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,4 +1,4 @@
-# Copyright 2022 NWChemEx-Project
+# Copyright 2026 NWChemEx-Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,46 +14,31 @@
 
 cmake_minimum_required(VERSION 3.14)
 
-#Downloads common CMake modules used throughout NWChemEx
+# Downloads common CMake modules used throughout NWChemEx. Included before
+# project() so nwx_set_version() is available to compute the version.
 include(cmake/get_nwx_cmake.cmake)
 
-#Sets the version to whatever git thinks it is
-include(get_version_from_git)
-get_version_from_git(utilities_version "${CMAKE_CURRENT_LIST_DIR}")
+# Version from scikit-build-core (wheels/sdists) or the latest git tag.
+include(nwx_set_version)
+nwx_set_version(utilities_version "${CMAKE_CURRENT_LIST_DIR}")
 project(utilities VERSION "${utilities_version}" LANGUAGES CXX)
-set(CMAKE_CXX_STANDARD 20)
 
-include(get_cmaize)
-include(nwx_cxx_api_docs)
-
-### Paths ###
-set(UTILITIES_INCLUDE_DIR "${CMAKE_CURRENT_LIST_DIR}/include")
-set(UTILITIES_SOURCE_DIR "${CMAKE_CURRENT_LIST_DIR}/src")
+include(disable_in_source_builds)
+include(set_default_nwx_options)
 
-nwx_cxx_api_docs("${UTILITIES_SOURCE_DIR}" "${UTILITIES_INCLUDE_DIR}")
+# Define the documentation target
+include(nwx_cxx_api_docs)
+nwx_cxx_api_docs("cxx/include" "cxx/src")
 
-### Options ###
-cmaize_option_list(
-    BUILD_TESTING OFF "Should we build the tests?"
-)
+# Build the library
+include(nwx_library)
+nwx_library(${PROJECT_NAME} "cxx/include" "cxx/src")
 
-cmaize_add_library(
+# Register the C++ tests
+include(catch2_tests_from_dir)
+catch2_tests_from_dir(
+    "unit_test_${PROJECT_NAME}"
+    "tests/cxx/unit_tests"
     ${PROJECT_NAME}
-    SOURCE_DIR "${UTILITIES_SOURCE_DIR}/${PROJECT_NAME}"
-    INCLUDE_DIRS "${UTILITIES_INCLUDE_DIR}/${PROJECT_NAME}"
+    PRIVATE_INCLUDES cxx/src
 )
-
-if("${BUILD_TESTING}")
-    set(UTILITIES_TEST_DIR "${CMAKE_CURRENT_LIST_DIR}/tests/unit_tests")
-
-    include(get_catch2)
-
-    cmaize_add_tests(
-        test_unit_${PROJECT_NAME}
-        SOURCE_DIR "${UTILITIES_TEST_DIR}"
-        INCLUDE_DIRS "${UTILITIES_SOURCE_DIR}/${PROJECT_NAME}"
-        DEPENDS Catch2 ${PROJECT_NAME}
-    )
-endif()
-
-cmaize_add_package(${PROJECT_NAME} NAMESPACE nwx::)
diff --git a/cmake/get_nwx_cmake.cmake b/cmake/get_nwx_cmake.cmake
index c99674d9..26b614ec 100644
--- a/cmake/get_nwx_cmake.cmake
+++ b/cmake/get_nwx_cmake.cmake
@@ -1,4 +1,4 @@
-# Copyright 2024 NWChemEx-Project
+# Copyright 2026 NWChemEx-Project
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,18 +14,66 @@
 
 include_guard()
 
+# Puts the shared NWXCMake modules on CMAKE_MODULE_PATH. This runs *before*
+# project() so factored helpers (e.g. nwx_set_version) are available to feed
+# project(VERSION ...).
+#
+# Resolution order:
+#   1. A pip-installed `nwxcmake` package (query it for its cmake/ dir). An
+#      editable install (`pip install -e /path/to/NWXCMake`) points at a local
+#      working copy, so NWXCMake edits are picked up with no git push.
+#   2. Fallback: FetchContent from github.com/NWChemEx/NWXCMake.
 macro(get_nwx_cmake)
-    include(FetchContent)
-    FetchContent_Declare(
-        nwx_cmake
-        GIT_REPOSITORY https://github.com/NWChemEx/NWXCMake
-    )
-    FetchContent_MakeAvailable(nwx_cmake)
-    set(
-        CMAKE_MODULE_PATH "${CMAKE_MODULE_PATH}" "${nwx_cmake_SOURCE_DIR}/cmake"
-        CACHE STRING ""
-        FORCE
-    )
+    if(NOT _NWX_CMAKE_MODULE_DIR)
+        # find_package(Python) needs no enabled language, so it is safe here,
+        # before project(). Request only the interpreter to avoid a dev/compiler
+        # probe this early.
+        find_package(Python QUIET COMPONENTS Interpreter)
+
+        set(_gnc_local_dir "")
+        if(Python_Interpreter_FOUND)
+            execute_process(
+                COMMAND "${Python_EXECUTABLE}" -c
+                    "import nwxcmake,sys;sys.stdout.write(nwxcmake.cmake_dir())"
+                OUTPUT_VARIABLE _gnc_local_dir
+                OUTPUT_STRIP_TRAILING_WHITESPACE
+                RESULT_VARIABLE _gnc_rc
+                ERROR_QUIET
+            )
+            if(NOT _gnc_rc EQUAL 0)
+                set(_gnc_local_dir "")
+            endif()
+        endif()
+
+        if(_gnc_local_dir AND IS_DIRECTORY "${_gnc_local_dir}")
+            message(STATUS
+                "NWXCMake: using local pip package at ${_gnc_local_dir}"
+            )
+            set(_gnc_resolved "${_gnc_local_dir}")
+        else()
+            message(STATUS
+                "NWXCMake: pip package not found; fetching from git"
+            )
+            include(FetchContent)
+            FetchContent_Declare(
+                nwx_cmake
+                GIT_REPOSITORY https://github.com/NWChemEx/NWXCMake
+            )
+            FetchContent_MakeAvailable(nwx_cmake)
+            set(_gnc_resolved "${nwx_cmake_SOURCE_DIR}/cmake")
+        endif()
+
+        # Cache the resolved directory (not CMAKE_MODULE_PATH itself) so
+        # reconfigures are stable. Clear this var (or the build dir) to
+        # re-resolve after switching between the pip and git sources.
+        set(_NWX_CMAKE_MODULE_DIR "${_gnc_resolved}"
+            CACHE INTERNAL "Resolved NWXCMake module directory"
+        )
+    endif()
+
+    # Prepend so NWXCMake modules win; set in the caller's scope (macro), do not
+    # FORCE-cache CMAKE_MODULE_PATH (avoids accumulating stale entries).
+    list(PREPEND CMAKE_MODULE_PATH "${_NWX_CMAKE_MODULE_DIR}")
 endmacro()
 
 get_nwx_cmake()
diff --git a/include/utilities/README.md b/cxx/include/utilities/README.md
similarity index 100%
rename from include/utilities/README.md
rename to cxx/include/utilities/README.md
diff --git a/include/utilities/containers/case_insensitive_map.hpp b/cxx/include/utilities/containers/case_insensitive_map.hpp
similarity index 100%
rename from include/utilities/containers/case_insensitive_map.hpp
rename to cxx/include/utilities/containers/case_insensitive_map.hpp
diff --git a/include/utilities/containers/indexable_container_base.hpp b/cxx/include/utilities/containers/indexable_container_base.hpp
similarity index 100%
rename from include/utilities/containers/indexable_container_base.hpp
rename to cxx/include/utilities/containers/indexable_container_base.hpp
diff --git a/include/utilities/containers/math_set.hpp b/cxx/include/utilities/containers/math_set.hpp
similarity index 100%
rename from include/utilities/containers/math_set.hpp
rename to cxx/include/utilities/containers/math_set.hpp
diff --git a/include/utilities/containers/own_or_borrow.hpp b/cxx/include/utilities/containers/own_or_borrow.hpp
similarity index 100%
rename from include/utilities/containers/own_or_borrow.hpp
rename to cxx/include/utilities/containers/own_or_borrow.hpp
diff --git a/include/utilities/dsl/add.hpp b/cxx/include/utilities/dsl/add.hpp
similarity index 100%
rename from include/utilities/dsl/add.hpp
rename to cxx/include/utilities/dsl/add.hpp
diff --git a/include/utilities/dsl/binary_op.hpp b/cxx/include/utilities/dsl/binary_op.hpp
similarity index 100%
rename from include/utilities/dsl/binary_op.hpp
rename to cxx/include/utilities/dsl/binary_op.hpp
diff --git a/include/utilities/dsl/detail_/leaf_holder.hpp b/cxx/include/utilities/dsl/detail_/leaf_holder.hpp
similarity index 100%
rename from include/utilities/dsl/detail_/leaf_holder.hpp
rename to cxx/include/utilities/dsl/detail_/leaf_holder.hpp
diff --git a/include/utilities/dsl/divide.hpp b/cxx/include/utilities/dsl/divide.hpp
similarity index 100%
rename from include/utilities/dsl/divide.hpp
rename to cxx/include/utilities/dsl/divide.hpp
diff --git a/include/utilities/dsl/dsl.hpp b/cxx/include/utilities/dsl/dsl.hpp
similarity index 100%
rename from include/utilities/dsl/dsl.hpp
rename to cxx/include/utilities/dsl/dsl.hpp
diff --git a/include/utilities/dsl/dsl_fwd.hpp b/cxx/include/utilities/dsl/dsl_fwd.hpp
similarity index 100%
rename from include/utilities/dsl/dsl_fwd.hpp
rename to cxx/include/utilities/dsl/dsl_fwd.hpp
diff --git a/include/utilities/dsl/dsl_traits.hpp b/cxx/include/utilities/dsl/dsl_traits.hpp
similarity index 100%
rename from include/utilities/dsl/dsl_traits.hpp
rename to cxx/include/utilities/dsl/dsl_traits.hpp
diff --git a/include/utilities/dsl/function_call.hpp b/cxx/include/utilities/dsl/function_call.hpp
similarity index 100%
rename from include/utilities/dsl/function_call.hpp
rename to cxx/include/utilities/dsl/function_call.hpp
diff --git a/include/utilities/dsl/leaf.hpp b/cxx/include/utilities/dsl/leaf.hpp
similarity index 100%
rename from include/utilities/dsl/leaf.hpp
rename to cxx/include/utilities/dsl/leaf.hpp
diff --git a/include/utilities/dsl/multiply.hpp b/cxx/include/utilities/dsl/multiply.hpp
similarity index 100%
rename from include/utilities/dsl/multiply.hpp
rename to cxx/include/utilities/dsl/multiply.hpp
diff --git a/include/utilities/dsl/n_ary_op.hpp b/cxx/include/utilities/dsl/n_ary_op.hpp
similarity index 100%
rename from include/utilities/dsl/n_ary_op.hpp
rename to cxx/include/utilities/dsl/n_ary_op.hpp
diff --git a/include/utilities/dsl/subtract.hpp b/cxx/include/utilities/dsl/subtract.hpp
similarity index 100%
rename from include/utilities/dsl/subtract.hpp
rename to cxx/include/utilities/dsl/subtract.hpp
diff --git a/include/utilities/dsl/term.hpp b/cxx/include/utilities/dsl/term.hpp
similarity index 100%
rename from include/utilities/dsl/term.hpp
rename to cxx/include/utilities/dsl/term.hpp
diff --git a/include/utilities/dsl/term_traits.hpp b/cxx/include/utilities/dsl/term_traits.hpp
similarity index 100%
rename from include/utilities/dsl/term_traits.hpp
rename to cxx/include/utilities/dsl/term_traits.hpp
diff --git a/include/utilities/iter_tools.hpp b/cxx/include/utilities/iter_tools.hpp
similarity index 100%
rename from include/utilities/iter_tools.hpp
rename to cxx/include/utilities/iter_tools.hpp
diff --git a/include/utilities/iter_tools/enumerate.hpp b/cxx/include/utilities/iter_tools/enumerate.hpp
similarity index 100%
rename from include/utilities/iter_tools/enumerate.hpp
rename to cxx/include/utilities/iter_tools/enumerate.hpp
diff --git a/include/utilities/iter_tools/range.hpp b/cxx/include/utilities/iter_tools/range.hpp
similarity index 100%
rename from include/utilities/iter_tools/range.hpp
rename to cxx/include/utilities/iter_tools/range.hpp
diff --git a/include/utilities/iter_tools/zip.hpp b/cxx/include/utilities/iter_tools/zip.hpp
similarity index 100%
rename from include/utilities/iter_tools/zip.hpp
rename to cxx/include/utilities/iter_tools/zip.hpp
diff --git a/include/utilities/iterators/README.md b/cxx/include/utilities/iterators/README.md
similarity index 100%
rename from include/utilities/iterators/README.md
rename to cxx/include/utilities/iterators/README.md
diff --git a/include/utilities/iterators/bidirectional_iterator_base.hpp b/cxx/include/utilities/iterators/bidirectional_iterator_base.hpp
similarity index 100%
rename from include/utilities/iterators/bidirectional_iterator_base.hpp
rename to cxx/include/utilities/iterators/bidirectional_iterator_base.hpp
diff --git a/include/utilities/iterators/input_iterator_base.hpp b/cxx/include/utilities/iterators/input_iterator_base.hpp
similarity index 100%
rename from include/utilities/iterators/input_iterator_base.hpp
rename to cxx/include/utilities/iterators/input_iterator_base.hpp
diff --git a/include/utilities/iterators/offset_iterator.hpp b/cxx/include/utilities/iterators/offset_iterator.hpp
similarity index 100%
rename from include/utilities/iterators/offset_iterator.hpp
rename to cxx/include/utilities/iterators/offset_iterator.hpp
diff --git a/include/utilities/iterators/random_access_iterator_base.hpp b/cxx/include/utilities/iterators/random_access_iterator_base.hpp
similarity index 100%
rename from include/utilities/iterators/random_access_iterator_base.hpp
rename to cxx/include/utilities/iterators/random_access_iterator_base.hpp
diff --git a/include/utilities/mathematician/integer_utils.hpp b/cxx/include/utilities/mathematician/integer_utils.hpp
similarity index 100%
rename from include/utilities/mathematician/integer_utils.hpp
rename to cxx/include/utilities/mathematician/integer_utils.hpp
diff --git a/include/utilities/printing/demangler.hpp b/cxx/include/utilities/printing/demangler.hpp
similarity index 100%
rename from include/utilities/printing/demangler.hpp
rename to cxx/include/utilities/printing/demangler.hpp
diff --git a/include/utilities/printing/print_stl.hpp b/cxx/include/utilities/printing/print_stl.hpp
similarity index 100%
rename from include/utilities/printing/print_stl.hpp
rename to cxx/include/utilities/printing/print_stl.hpp
diff --git a/include/utilities/printing/print_stl.ipp b/cxx/include/utilities/printing/print_stl.ipp
similarity index 100%
rename from include/utilities/printing/print_stl.ipp
rename to cxx/include/utilities/printing/print_stl.ipp
diff --git a/include/utilities/printing/word_wrap_stream.hpp b/cxx/include/utilities/printing/word_wrap_stream.hpp
similarity index 100%
rename from include/utilities/printing/word_wrap_stream.hpp
rename to cxx/include/utilities/printing/word_wrap_stream.hpp
diff --git a/include/utilities/strings/string_tools.hpp b/cxx/include/utilities/strings/string_tools.hpp
similarity index 100%
rename from include/utilities/strings/string_tools.hpp
rename to cxx/include/utilities/strings/string_tools.hpp
diff --git a/include/utilities/timer.hpp b/cxx/include/utilities/timer.hpp
similarity index 100%
rename from include/utilities/timer.hpp
rename to cxx/include/utilities/timer.hpp
diff --git a/include/utilities/type_traits/is_printable.hpp b/cxx/include/utilities/type_traits/is_printable.hpp
similarity index 100%
rename from include/utilities/type_traits/is_printable.hpp
rename to cxx/include/utilities/type_traits/is_printable.hpp
diff --git a/include/utilities/type_traits/parameter_pack_traits.hpp b/cxx/include/utilities/type_traits/parameter_pack_traits.hpp
similarity index 100%
rename from include/utilities/type_traits/parameter_pack_traits.hpp
rename to cxx/include/utilities/type_traits/parameter_pack_traits.hpp
diff --git a/include/utilities/type_traits/tuple/count_type.hpp b/cxx/include/utilities/type_traits/tuple/count_type.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/count_type.hpp
rename to cxx/include/utilities/type_traits/tuple/count_type.hpp
diff --git a/include/utilities/type_traits/tuple/has_type.hpp b/cxx/include/utilities/type_traits/tuple/has_type.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/has_type.hpp
rename to cxx/include/utilities/type_traits/tuple/has_type.hpp
diff --git a/include/utilities/type_traits/tuple/is_tuple.hpp b/cxx/include/utilities/type_traits/tuple/is_tuple.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/is_tuple.hpp
rename to cxx/include/utilities/type_traits/tuple/is_tuple.hpp
diff --git a/include/utilities/type_traits/tuple/tuple.hpp b/cxx/include/utilities/type_traits/tuple/tuple.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/tuple.hpp
rename to cxx/include/utilities/type_traits/tuple/tuple.hpp
diff --git a/include/utilities/type_traits/tuple/tuple_cat.hpp b/cxx/include/utilities/type_traits/tuple/tuple_cat.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/tuple_cat.hpp
rename to cxx/include/utilities/type_traits/tuple/tuple_cat.hpp
diff --git a/include/utilities/type_traits/tuple/tuple_product.hpp b/cxx/include/utilities/type_traits/tuple/tuple_product.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/tuple_product.hpp
rename to cxx/include/utilities/type_traits/tuple/tuple_product.hpp
diff --git a/include/utilities/type_traits/tuple/tuple_utilities.hpp b/cxx/include/utilities/type_traits/tuple/tuple_utilities.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/tuple_utilities.hpp
rename to cxx/include/utilities/type_traits/tuple/tuple_utilities.hpp
diff --git a/include/utilities/type_traits/tuple/variant.hpp b/cxx/include/utilities/type_traits/tuple/variant.hpp
similarity index 100%
rename from include/utilities/type_traits/tuple/variant.hpp
rename to cxx/include/utilities/type_traits/tuple/variant.hpp
diff --git a/include/utilities/type_traits/type_traits_extensions.hpp b/cxx/include/utilities/type_traits/type_traits_extensions.hpp
similarity index 100%
rename from include/utilities/type_traits/type_traits_extensions.hpp
rename to cxx/include/utilities/type_traits/type_traits_extensions.hpp
diff --git a/include/utilities/type_traits/variant/add_const.hpp b/cxx/include/utilities/type_traits/variant/add_const.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/add_const.hpp
rename to cxx/include/utilities/type_traits/variant/add_const.hpp
diff --git a/include/utilities/type_traits/variant/cat.hpp b/cxx/include/utilities/type_traits/variant/cat.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/cat.hpp
rename to cxx/include/utilities/type_traits/variant/cat.hpp
diff --git a/include/utilities/type_traits/variant/decay.hpp b/cxx/include/utilities/type_traits/variant/decay.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/decay.hpp
rename to cxx/include/utilities/type_traits/variant/decay.hpp
diff --git a/include/utilities/type_traits/variant/has_type.hpp b/cxx/include/utilities/type_traits/variant/has_type.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/has_type.hpp
rename to cxx/include/utilities/type_traits/variant/has_type.hpp
diff --git a/include/utilities/type_traits/variant/to_tuple.hpp b/cxx/include/utilities/type_traits/variant/to_tuple.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/to_tuple.hpp
rename to cxx/include/utilities/type_traits/variant/to_tuple.hpp
diff --git a/include/utilities/type_traits/variant/tuple.hpp b/cxx/include/utilities/type_traits/variant/tuple.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/tuple.hpp
rename to cxx/include/utilities/type_traits/variant/tuple.hpp
diff --git a/include/utilities/type_traits/variant/variant.hpp b/cxx/include/utilities/type_traits/variant/variant.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/variant.hpp
rename to cxx/include/utilities/type_traits/variant/variant.hpp
diff --git a/include/utilities/type_traits/variant/variant_product.hpp b/cxx/include/utilities/type_traits/variant/variant_product.hpp
similarity index 100%
rename from include/utilities/type_traits/variant/variant_product.hpp
rename to cxx/include/utilities/type_traits/variant/variant_product.hpp
diff --git a/src/utilities/printing/demangler.cpp b/cxx/src/utilities/printing/demangler.cpp
similarity index 100%
rename from src/utilities/printing/demangler.cpp
rename to cxx/src/utilities/printing/demangler.cpp
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 00000000..1802b514
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,49 @@
+# Copyright 2026 NWChemEx-Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+[build-system]
+requires = [
+    "scikit-build-core>=0.10",
+    "setuptools-scm>=8",
+]
+build-backend = "scikit_build_core.build"
+
+[project]
+name = "nwchemex-utilities"
+dynamic = ["version"]
+description = "General-purpose C++ utilities for the NWChemEx ecosystem"
+license = { text = "Apache-2.0" }
+requires-python = ">=3.8"
+dependencies = [
+    "nwchemex-nwxcmake>=0.1.0",
+]
+
+[project.optional-dependencies]
+dev = ["pre-commit"]
+
+[tool.scikit-build]
+metadata.version.provider = "scikit_build_core.metadata.setuptools_scm"
+cmake.build-type = "Release"
+cmake.args = ["-DBUILD_TESTING=OFF"]
+# All installed content comes from the CMake install; no pure-Python packages.
+wheel.packages = []
+build-dir = "build"
+
+[tool.setuptools_scm]
+fallback_version = "0.0.0"
+
+# For editable (developer) installs, also build the tests.
+[[tool.scikit-build.overrides]]
+if.state = "editable"
+cmake.args = ["-DDEVELOPER_SETUP=ON"]
diff --git a/tests/unit_tests/catch.hpp b/tests/cxx/unit_tests/catch.hpp
similarity index 100%
rename from tests/unit_tests/catch.hpp
rename to tests/cxx/unit_tests/catch.hpp
diff --git a/tests/unit_tests/containers/case_insensitive_map.cpp b/tests/cxx/unit_tests/containers/case_insensitive_map.cpp
similarity index 100%
rename from tests/unit_tests/containers/case_insensitive_map.cpp
rename to tests/cxx/unit_tests/containers/case_insensitive_map.cpp
diff --git a/tests/unit_tests/containers/indexable_container_base.cpp b/tests/cxx/unit_tests/containers/indexable_container_base.cpp
similarity index 100%
rename from tests/unit_tests/containers/indexable_container_base.cpp
rename to tests/cxx/unit_tests/containers/indexable_container_base.cpp
diff --git a/tests/unit_tests/containers/math_set.cpp b/tests/cxx/unit_tests/containers/math_set.cpp
similarity index 100%
rename from tests/unit_tests/containers/math_set.cpp
rename to tests/cxx/unit_tests/containers/math_set.cpp
diff --git a/tests/unit_tests/containers/own_or_borrow.cpp b/tests/cxx/unit_tests/containers/own_or_borrow.cpp
similarity index 100%
rename from tests/unit_tests/containers/own_or_borrow.cpp
rename to tests/cxx/unit_tests/containers/own_or_borrow.cpp
diff --git a/tests/unit_tests/dsl/add.cpp b/tests/cxx/unit_tests/dsl/add.cpp
similarity index 100%
rename from tests/unit_tests/dsl/add.cpp
rename to tests/cxx/unit_tests/dsl/add.cpp
diff --git a/tests/unit_tests/dsl/binary_op.cpp b/tests/cxx/unit_tests/dsl/binary_op.cpp
similarity index 100%
rename from tests/unit_tests/dsl/binary_op.cpp
rename to tests/cxx/unit_tests/dsl/binary_op.cpp
diff --git a/tests/unit_tests/dsl/detail_/leaf_holder.cpp b/tests/cxx/unit_tests/dsl/detail_/leaf_holder.cpp
similarity index 100%
rename from tests/unit_tests/dsl/detail_/leaf_holder.cpp
rename to tests/cxx/unit_tests/dsl/detail_/leaf_holder.cpp
diff --git a/tests/unit_tests/dsl/divide.cpp b/tests/cxx/unit_tests/dsl/divide.cpp
similarity index 100%
rename from tests/unit_tests/dsl/divide.cpp
rename to tests/cxx/unit_tests/dsl/divide.cpp
diff --git a/tests/unit_tests/dsl/function_call.cpp b/tests/cxx/unit_tests/dsl/function_call.cpp
similarity index 100%
rename from tests/unit_tests/dsl/function_call.cpp
rename to tests/cxx/unit_tests/dsl/function_call.cpp
diff --git a/tests/unit_tests/dsl/leaf.cpp b/tests/cxx/unit_tests/dsl/leaf.cpp
similarity index 100%
rename from tests/unit_tests/dsl/leaf.cpp
rename to tests/cxx/unit_tests/dsl/leaf.cpp
diff --git a/tests/unit_tests/dsl/multiply.cpp b/tests/cxx/unit_tests/dsl/multiply.cpp
similarity index 100%
rename from tests/unit_tests/dsl/multiply.cpp
rename to tests/cxx/unit_tests/dsl/multiply.cpp
diff --git a/tests/unit_tests/dsl/n_ary_op.cpp b/tests/cxx/unit_tests/dsl/n_ary_op.cpp
similarity index 100%
rename from tests/unit_tests/dsl/n_ary_op.cpp
rename to tests/cxx/unit_tests/dsl/n_ary_op.cpp
diff --git a/tests/unit_tests/dsl/subtract.cpp b/tests/cxx/unit_tests/dsl/subtract.cpp
similarity index 100%
rename from tests/unit_tests/dsl/subtract.cpp
rename to tests/cxx/unit_tests/dsl/subtract.cpp
diff --git a/tests/unit_tests/dsl/term.cpp b/tests/cxx/unit_tests/dsl/term.cpp
similarity index 100%
rename from tests/unit_tests/dsl/term.cpp
rename to tests/cxx/unit_tests/dsl/term.cpp
diff --git a/tests/unit_tests/dsl/term_traits.cpp b/tests/cxx/unit_tests/dsl/term_traits.cpp
similarity index 100%
rename from tests/unit_tests/dsl/term_traits.cpp
rename to tests/cxx/unit_tests/dsl/term_traits.cpp
diff --git a/tests/unit_tests/dsl/test_dsl.hpp b/tests/cxx/unit_tests/dsl/test_dsl.hpp
similarity index 100%
rename from tests/unit_tests/dsl/test_dsl.hpp
rename to tests/cxx/unit_tests/dsl/test_dsl.hpp
diff --git a/tests/unit_tests/iter_tools/enumerate.cpp b/tests/cxx/unit_tests/iter_tools/enumerate.cpp
similarity index 100%
rename from tests/unit_tests/iter_tools/enumerate.cpp
rename to tests/cxx/unit_tests/iter_tools/enumerate.cpp
diff --git a/tests/unit_tests/iter_tools/range.cpp b/tests/cxx/unit_tests/iter_tools/range.cpp
similarity index 100%
rename from tests/unit_tests/iter_tools/range.cpp
rename to tests/cxx/unit_tests/iter_tools/range.cpp
diff --git a/tests/unit_tests/iter_tools/zip.cpp b/tests/cxx/unit_tests/iter_tools/zip.cpp
similarity index 100%
rename from tests/unit_tests/iter_tools/zip.cpp
rename to tests/cxx/unit_tests/iter_tools/zip.cpp
diff --git a/tests/unit_tests/iterators/bidirectional_iterator_base.cpp b/tests/cxx/unit_tests/iterators/bidirectional_iterator_base.cpp
similarity index 100%
rename from tests/unit_tests/iterators/bidirectional_iterator_base.cpp
rename to tests/cxx/unit_tests/iterators/bidirectional_iterator_base.cpp
diff --git a/tests/unit_tests/iterators/input_iterator_base.cpp b/tests/cxx/unit_tests/iterators/input_iterator_base.cpp
similarity index 100%
rename from tests/unit_tests/iterators/input_iterator_base.cpp
rename to tests/cxx/unit_tests/iterators/input_iterator_base.cpp
diff --git a/tests/unit_tests/iterators/offset_iterator.cpp b/tests/cxx/unit_tests/iterators/offset_iterator.cpp
similarity index 100%
rename from tests/unit_tests/iterators/offset_iterator.cpp
rename to tests/cxx/unit_tests/iterators/offset_iterator.cpp
diff --git a/tests/unit_tests/iterators/random_access_iterator_base.cpp b/tests/cxx/unit_tests/iterators/random_access_iterator_base.cpp
similarity index 100%
rename from tests/unit_tests/iterators/random_access_iterator_base.cpp
rename to tests/cxx/unit_tests/iterators/random_access_iterator_base.cpp
diff --git a/tests/unit_tests/mathematician/integer_utils.cpp b/tests/cxx/unit_tests/mathematician/integer_utils.cpp
similarity index 100%
rename from tests/unit_tests/mathematician/integer_utils.cpp
rename to tests/cxx/unit_tests/mathematician/integer_utils.cpp
diff --git a/tests/unit_tests/printing/demangler.cpp b/tests/cxx/unit_tests/printing/demangler.cpp
similarity index 100%
rename from tests/unit_tests/printing/demangler.cpp
rename to tests/cxx/unit_tests/printing/demangler.cpp
diff --git a/tests/unit_tests/printing/print_stl.cpp b/tests/cxx/unit_tests/printing/print_stl.cpp
similarity index 100%
rename from tests/unit_tests/printing/print_stl.cpp
rename to tests/cxx/unit_tests/printing/print_stl.cpp
diff --git a/tests/unit_tests/printing/word_wrap_stream.cpp b/tests/cxx/unit_tests/printing/word_wrap_stream.cpp
similarity index 100%
rename from tests/unit_tests/printing/word_wrap_stream.cpp
rename to tests/cxx/unit_tests/printing/word_wrap_stream.cpp
diff --git a/tests/unit_tests/strings/string_tools.cpp b/tests/cxx/unit_tests/strings/string_tools.cpp
similarity index 100%
rename from tests/unit_tests/strings/string_tools.cpp
rename to tests/cxx/unit_tests/strings/string_tools.cpp
diff --git a/tests/unit_tests/test_helpers.hpp b/tests/cxx/unit_tests/test_helpers.hpp
similarity index 100%
rename from tests/unit_tests/test_helpers.hpp
rename to tests/cxx/unit_tests/test_helpers.hpp
diff --git a/tests/unit_tests/test_main.cpp b/tests/cxx/unit_tests/test_main.cpp
similarity index 100%
rename from tests/unit_tests/test_main.cpp
rename to tests/cxx/unit_tests/test_main.cpp
diff --git a/tests/unit_tests/timer.cpp b/tests/cxx/unit_tests/timer.cpp
similarity index 100%
rename from tests/unit_tests/timer.cpp
rename to tests/cxx/unit_tests/timer.cpp
diff --git a/tests/unit_tests/type_traits/parameter_pack_traits.cpp b/tests/cxx/unit_tests/type_traits/parameter_pack_traits.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/parameter_pack_traits.cpp
rename to tests/cxx/unit_tests/type_traits/parameter_pack_traits.cpp
diff --git a/tests/unit_tests/type_traits/tuple/count_type.cpp b/tests/cxx/unit_tests/type_traits/tuple/count_type.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/count_type.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/count_type.cpp
diff --git a/tests/unit_tests/type_traits/tuple/has_type.cpp b/tests/cxx/unit_tests/type_traits/tuple/has_type.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/has_type.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/has_type.cpp
diff --git a/tests/unit_tests/type_traits/tuple/is_tuple.cpp b/tests/cxx/unit_tests/type_traits/tuple/is_tuple.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/is_tuple.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/is_tuple.cpp
diff --git a/tests/unit_tests/type_traits/tuple/tuple_cat.cpp b/tests/cxx/unit_tests/type_traits/tuple/tuple_cat.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/tuple_cat.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/tuple_cat.cpp
diff --git a/tests/unit_tests/type_traits/tuple/tuple_product.cpp b/tests/cxx/unit_tests/type_traits/tuple/tuple_product.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/tuple_product.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/tuple_product.cpp
diff --git a/tests/unit_tests/type_traits/tuple/tuple_utilities.cpp b/tests/cxx/unit_tests/type_traits/tuple/tuple_utilities.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/tuple_utilities.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/tuple_utilities.cpp
diff --git a/tests/unit_tests/type_traits/tuple/variant.cpp b/tests/cxx/unit_tests/type_traits/tuple/variant.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/tuple/variant.cpp
rename to tests/cxx/unit_tests/type_traits/tuple/variant.cpp
diff --git a/tests/unit_tests/type_traits/type_traits_extensions.cpp b/tests/cxx/unit_tests/type_traits/type_traits_extensions.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/type_traits_extensions.cpp
rename to tests/cxx/unit_tests/type_traits/type_traits_extensions.cpp
diff --git a/tests/unit_tests/type_traits/variant/add_const.cpp b/tests/cxx/unit_tests/type_traits/variant/add_const.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/add_const.cpp
rename to tests/cxx/unit_tests/type_traits/variant/add_const.cpp
diff --git a/tests/unit_tests/type_traits/variant/cat.cpp b/tests/cxx/unit_tests/type_traits/variant/cat.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/cat.cpp
rename to tests/cxx/unit_tests/type_traits/variant/cat.cpp
diff --git a/tests/unit_tests/type_traits/variant/decay.cpp b/tests/cxx/unit_tests/type_traits/variant/decay.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/decay.cpp
rename to tests/cxx/unit_tests/type_traits/variant/decay.cpp
diff --git a/tests/unit_tests/type_traits/variant/has_type.cpp b/tests/cxx/unit_tests/type_traits/variant/has_type.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/has_type.cpp
rename to tests/cxx/unit_tests/type_traits/variant/has_type.cpp
diff --git a/tests/unit_tests/type_traits/variant/to_tuple.cpp b/tests/cxx/unit_tests/type_traits/variant/to_tuple.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/to_tuple.cpp
rename to tests/cxx/unit_tests/type_traits/variant/to_tuple.cpp
diff --git a/tests/unit_tests/type_traits/variant/tuple.cpp b/tests/cxx/unit_tests/type_traits/variant/tuple.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/tuple.cpp
rename to tests/cxx/unit_tests/type_traits/variant/tuple.cpp
diff --git a/tests/unit_tests/type_traits/variant/variant_product.cpp b/tests/cxx/unit_tests/type_traits/variant/variant_product.cpp
similarity index 100%
rename from tests/unit_tests/type_traits/variant/variant_product.cpp
rename to tests/cxx/unit_tests/type_traits/variant/variant_product.cpp