diff --git a/.eslintrc.json b/.eslintrc.json
new file mode 100644
index 000000000..fdf456442
--- /dev/null
+++ b/.eslintrc.json
@@ -0,0 +1,22 @@
+{
+  "env": {
+    "node": true,
+    "es2021": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended"
+  ],
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": "latest",
+    "sourceType": "module"
+  },
+  "plugins": ["@typescript-eslint"],
+  "rules": {
+    "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
+    "@typescript-eslint/no-explicit-any": "warn",
+    "no-console": "off"
+  },
+  "ignorePatterns": ["lib/", "node_modules/", "tabs/", "functions/"]
+}
diff --git a/.github/workflows/ci-quality-checks.yml b/.github/workflows/ci-quality-checks.yml
new file mode 100644
index 000000000..9a079e9a9
--- /dev/null
+++ b/.github/workflows/ci-quality-checks.yml
@@ -0,0 +1,102 @@
+# CI workflow for code quality checks
+# Runs linting, formatting validation, and type checking
+
+name: Code Quality Checks
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  lint-and-format-bot:
+    name: Lint & Format (Bot/Backend)
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run ESLint
+        run: npm run lint
+
+      - name: Check Prettier formatting
+        run: npm run format:check
+
+      - name: Run TypeScript type check
+        run: npm run typecheck
+
+  lint-and-format-tabs:
+    name: Lint & Format (Frontend/Tabs)
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+          cache-dependency-path: tabs/package-lock.json
+
+      - name: Install dependencies
+        working-directory: tabs
+        run: npm ci
+
+      - name: Run ESLint
+        working-directory: tabs
+        run: npm run lint
+
+      - name: Check Prettier formatting
+        working-directory: tabs
+        run: npm run format:check
+
+      - name: Run TypeScript type check
+        working-directory: tabs
+        run: npm run typecheck
+
+  build-check:
+    name: Build Verification
+    runs-on: ubuntu-latest
+    needs: [lint-and-format-bot, lint-and-format-tabs]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20.x'
+          cache: 'npm'
+
+      - name: Install Bot dependencies
+        run: npm ci
+
+      - name: Build Bot
+        run: npm run build
+
+      - name: Install Tabs dependencies
+        working-directory: tabs
+        run: npm ci
+
+      - name: Build Tabs
+        working-directory: tabs
+        env:
+          CI: false
+        run: npm run build
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 000000000..1a25b6d58
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,15 @@
+# Dependencies
+node_modules/
+
+# Build outputs
+lib/
+build/
+dist/
+
+# Tabs (has its own prettier config)
+tabs/
+
+# Other
+*.min.js
+*.min.css
+package-lock.json
diff --git a/README.md b/README.md
index ecbd9e2ec..82137667f 100644
--- a/README.md
+++ b/README.md
@@ -98,6 +98,38 @@ Zaplie integrates directly with Microsoft Teams to enhance collaboration and rec
 2. Install the packages using `npm install`
 3. Run the application using `npm start`
 
+## Code Quality
+
+This project uses ESLint and Prettier to maintain code quality and consistent formatting. Quality checks run automatically on all pull requests to the `main` branch.
+
+### Available Scripts
+
+**Bot/Backend (root directory):**
+```bash
+npm run lint          # Run ESLint
+npm run lint:fix      # Auto-fix lint issues
+npm run format        # Format code with Prettier
+npm run format:check  # Check formatting without changes
+npm run typecheck     # Run TypeScript type checking
+```
+
+**Frontend/Tabs (`tabs/` directory):**
+```bash
+npm run lint          # Run ESLint
+npm run lint:fix      # Auto-fix lint issues
+npm run format        # Format code with Prettier
+npm run format:check  # Check formatting without changes
+npm run typecheck     # Run TypeScript type checking
+```
+
+### CI Pipeline
+
+The CI workflow (`.github/workflows/ci-quality-checks.yml`) runs on every push and PR to `main`:
+1. **Linting** - ESLint checks for both bot and tabs
+2. **Formatting** - Prettier validation
+3. **Type Checking** - TypeScript compilation checks for both bot and tabs
+4. **Build Verification** - Ensures both projects build successfully
+
 # Get in touch
 
 Have fun, and tag us on Twitter / Nostr!
diff --git a/package.json b/package.json
index f8940c53a..1acf8466b 100644
--- a/package.json
+++ b/package.json
@@ -3,7 +3,7 @@
   "version": "1.0.0",
   "description": "Microsoft Teams Toolkit sso bot sample",
   "engines": {
-    "node": "16 || 18"
+    "node": "16 || 18 || 20"
   },
   "author": "Microsoft",
   "license": "MIT",
@@ -16,7 +16,12 @@
     "write-env": "cross-env TEAMSFX_ENV=$TEAMSFX_ENV node scripts/writeEnv.js",
     "start": "node ./lib/src/index.js",
     "watch": "nodemon --exec \"npm run start\"",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "lint": "eslint src/ --ext .ts,.tsx",
+    "lint:fix": "eslint src/ --ext .ts,.tsx --fix",
+    "format": "prettier --write \"src/**/*.{ts,tsx,json}\"",
+    "format:check": "prettier --check \"src/**/*.{ts,tsx,json}\"",
+    "typecheck": "tsc --noEmit"
   },
   "repository": {
     "type": "git",
@@ -41,9 +46,13 @@
     "@types/jest": "^29.5.12",
     "@types/node": "^14.0.0",
     "@types/restify": "8.5.5",
+    "@typescript-eslint/eslint-plugin": "^7.0.0",
+    "@typescript-eslint/parser": "^7.0.0",
     "cross-env": "^7.0.3",
     "env-cmd": "^10.1.0",
+    "eslint": "^8.57.0",
     "nodemon": "^2.0.7",
+    "prettier": "^3.2.0",
     "shx": "^0.3.3",
     "ts-jest": "^29.2.4",
     "ts-node": "^10.4.0",
diff --git a/tabs/.prettierignore b/tabs/.prettierignore
new file mode 100644
index 000000000..547a442cd
--- /dev/null
+++ b/tabs/.prettierignore
@@ -0,0 +1,10 @@
+# Dependencies
+node_modules/
+
+# Build outputs
+build/
+
+# Other
+*.min.js
+*.min.css
+package-lock.json
diff --git a/tabs/.prettierrc b/tabs/.prettierrc
new file mode 100644
index 000000000..6d55a7a77
--- /dev/null
+++ b/tabs/.prettierrc
@@ -0,0 +1,10 @@
+{
+  "tabWidth": 2,
+  "useTabs": false,
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "all",
+  "bracketSpacing": true,
+  "arrowParens": "avoid",
+  "printWidth": 80
+}
diff --git a/tabs/package.json b/tabs/package.json
index b6b6ce3ff..9551522f4 100644
--- a/tabs/package.json
+++ b/tabs/package.json
@@ -38,7 +38,12 @@
     "client": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "lint": "eslint src/ --ext .js,.jsx,.ts,.tsx",
+    "lint:fix": "eslint src/ --ext .js,.jsx,.ts,.tsx --fix",
+    "format": "prettier --write \"src/**/*.{js,jsx,ts,tsx,json,css}\"",
+    "format:check": "prettier --check \"src/**/*.{js,jsx,ts,tsx,json,css}\"",
+    "typecheck": "tsc --noEmit"
   },
   "eslintConfig": {
     "extends": [
@@ -66,6 +71,7 @@
     "@types/react-dom": "^18.3.0",
     "@types/react-qr-reader": "^2.1.7",
     "concurrently": "^9.1.2",
+    "prettier": "^3.2.0",
     "ts-loader": "^9.5.1",
     "typescript": "^4.9.5"
   }