diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..61c4564
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,42 @@
+name: CI
+
+on:
+  push:
+    branches: [ "dev", "master", "main" ]
+  pull_request:
+    branches: [ "dev", "master", "main" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [16.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Prettier check (if present)
+        run: |
+          if npx --no-install prettier --version >/dev/null 2>&1; then
+            npx prettier --check "**/*.{ts,js,json,md,css}" || (echo "Prettier check failed" && exit 1)
+          else
+            echo "Prettier not installed - skipping check"
+          fi
+
+      - name: TypeScript typecheck and build
+        run: npm run build
+
+      - name: Run tests
+        run: npm test