diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0c7184e
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  test:
+    name: pytest
+    runs-on: ubuntu-latest
+
+    env:
+      PYTHONUNBUFFERED: "1"
+      SESSION_SECRET_KEY: "ci-only-session-secret-key-with-enough-length"
+      OPENROUTER_API_KEY: "ci-dummy-openrouter-key"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install pytest requests python-dotenv ollama psycopg SQLAlchemy
+
+      - name: Compile Python files
+        run: python -m compileall backend model_gateway evaluation tests
+
+      - name: Run smoke tests
+        run: |
+          pytest -q \
+            tests/test_network_safety.py \
+            tests/api/test_config.py \
+            tests/model_gateway/test_openrouter_provider.py \
+            tests/generation/test_orchestrator.py \
+            tests/grounding/test_citations.py \
+            tests/evaluation/test_wilson_intervals.py