diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..4c52920
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,100 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    name: Lint (Ruff)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Set up Python
+        run: uv python install 3.13
+
+      - name: Install dependencies
+        run: uv sync --extra dev
+
+      - name: Run Ruff linter
+        run: uv run ruff check .
+
+      - name: Run Ruff formatter check
+        run: uv run ruff format --check .
+
+  typecheck:
+    name: Type Check (ty)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Set up Python
+        run: uv python install 3.13
+
+      - name: Install dependencies
+        run: uv sync --extra dev
+
+      - name: Run ty
+        run: uv run ty check
+
+  test:
+    name: Test (Python ${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12", "3.13"]
+
+    services:
+      postgres:
+        image: postgres:18
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: test_db
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+
+      - name: Set up Python ${{ matrix.python-version }}
+        run: uv python install ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: uv sync --extra dev
+
+      - name: Run tests with coverage
+        env:
+          DATABASE_URL: postgresql+asyncpg://postgres:postgres@localhost:5432/test_db
+        run: |
+          uv run pytest --cov --cov-report=xml --cov-report=term-missing
+
+      - name: Upload coverage to Codecov
+        if: matrix.python-version == '3.13'
+        uses: codecov/codecov-action@v5
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
+          files: ./coverage.xml
+          fail_ci_if_error: false
diff --git a/README.md b/README.md
index bf90055..854fe4f 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 FastAPI Toolsets provides production-ready utilities for FastAPI applications built with async SQLAlchemy and PostgreSQL. It includes generic CRUD operations, a fixture system with dependency resolution, a Django-like CLI, standardized API responses, and structured exception handling with automatic OpenAPI documentation.
 
+[![CI](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml/badge.svg)](https://github.com/d3vyce/fastapi-toolsets/actions/workflows/ci.yml)
+[![codecov](https://codecov.io/gh/d3vyce/fastapi-toolsets/graph/badge.svg)](https://codecov.io/gh/d3vyce/fastapi-toolsets)
 [![ty](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ty/main/assets/badge/v0.json)](https://github.com/astral-sh/ty)
 [![uv](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/uv/main/assets/badge/v0.json)](https://github.com/astral-sh/uv)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
diff --git a/src/fastapi_toolsets/cli/app.py b/src/fastapi_toolsets/cli/app.py
index 03ea393..37ebd27 100644
--- a/src/fastapi_toolsets/cli/app.py
+++ b/src/fastapi_toolsets/cli/app.py
@@ -76,7 +76,9 @@ def _load_module_from_path(path: Path) -> object:
     path = path.resolve()
 
     # Add the parent directory to sys.path to support relative imports
-    parent_dir = str(path.parent.parent)  # Go up two levels (e.g., from app/cli_config.py to project root)
+    parent_dir = str(
+        path.parent.parent
+    )  # Go up two levels (e.g., from app/cli_config.py to project root)
     if parent_dir not in sys.path:
         sys.path.insert(0, parent_dir)
 
diff --git a/src/fastapi_toolsets/cli/commands/fixtures.py b/src/fastapi_toolsets/cli/commands/fixtures.py
index 7e2219a..a800e2f 100644
--- a/src/fastapi_toolsets/cli/commands/fixtures.py
+++ b/src/fastapi_toolsets/cli/commands/fixtures.py
@@ -44,9 +44,7 @@ def _get_db_context(ctx: typer.Context):
 
     get_db_context = getattr(config, "get_db_context", None)
     if get_db_context is None:
-        raise typer.BadParameter(
-            "Config module must have a 'get_db_context' function."
-        )
+        raise typer.BadParameter("Config module must have a 'get_db_context' function.")
 
     return get_db_context
 
@@ -56,7 +54,11 @@ def list_fixtures(
     ctx: typer.Context,
     context: Annotated[
         str | None,
-        typer.Option("--context", "-c", help="Filter by context (base, production, development, testing)."),
+        typer.Option(
+            "--context",
+            "-c",
+            help="Filter by context (base, production, development, testing).",
+        ),
     ] = None,
 ) -> None:
     """List all registered fixtures."""
@@ -110,7 +112,9 @@ def show_graph(
 
         typer.echo("\nFixture Dependency Graph:\n")
         for fixture in fixtures:
-            deps = f" -> [{', '.join(fixture.depends_on)}]" if fixture.depends_on else ""
+            deps = (
+                f" -> [{', '.join(fixture.depends_on)}]" if fixture.depends_on else ""
+            )
             typer.echo(f"  {fixture.name}{deps}")
 
 
@@ -119,15 +123,21 @@ def load(
     ctx: typer.Context,
     contexts: Annotated[
         list[str] | None,
-        typer.Argument(help="Contexts to load (base, production, development, testing)."),
+        typer.Argument(
+            help="Contexts to load (base, production, development, testing)."
+        ),
     ] = None,
     strategy: Annotated[
         str,
-        typer.Option("--strategy", "-s", help="Load strategy: merge, insert, skip_existing."),
+        typer.Option(
+            "--strategy", "-s", help="Load strategy: merge, insert, skip_existing."
+        ),
     ] = "merge",
     dry_run: Annotated[
         bool,
-        typer.Option("--dry-run", "-n", help="Show what would be loaded without loading."),
+        typer.Option(
+            "--dry-run", "-n", help="Show what would be loaded without loading."
+        ),
     ] = False,
 ) -> None:
     """Load fixtures into the database."""
@@ -144,7 +154,9 @@ def load(
     try:
         load_strategy = LoadStrategy(strategy)
     except ValueError:
-        typer.echo(f"Invalid strategy: {strategy}. Use: merge, insert, skip_existing", err=True)
+        typer.echo(
+            f"Invalid strategy: {strategy}. Use: merge, insert, skip_existing", err=True
+        )
         raise typer.Exit(1)
 
     # Resolve what will be loaded
@@ -196,7 +208,9 @@ def show_fixture(
 
     typer.echo(f"\nFixture: {fixture.name}")
     typer.echo(f"Contexts: {', '.join(fixture.contexts)}")
-    typer.echo(f"Dependencies: {', '.join(fixture.depends_on) if fixture.depends_on else 'None'}")
+    typer.echo(
+        f"Dependencies: {', '.join(fixture.depends_on) if fixture.depends_on else 'None'}"
+    )
 
     # Show instances
     instances = list(fixture.func())
diff --git a/src/fastapi_toolsets/fixtures/pytest_plugin.py b/src/fastapi_toolsets/fixtures/pytest_plugin.py
index d4f8dc9..29b3446 100644
--- a/src/fastapi_toolsets/fixtures/pytest_plugin.py
+++ b/src/fastapi_toolsets/fixtures/pytest_plugin.py
@@ -62,7 +62,6 @@ from ..db import get_transaction
 from .fixtures import FixtureRegistry, LoadStrategy
 
 
-
 def register_fixtures(
     registry: FixtureRegistry,
     namespace: dict[str, Any],
diff --git a/tests/conftest.py b/tests/conftest.py
index 6e97bf3..364bea9 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -5,13 +5,13 @@ import os
 import pytest
 from pydantic import BaseModel
 from sqlalchemy import ForeignKey, String
-from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
+from sqlalchemy.ext.asyncio import async_sessionmaker, create_async_engine
 from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
 
 from fastapi_toolsets.crud import CrudFactory
 
 # PostgreSQL connection URL from environment or default for local development
-DATABASE_URL = os.getenv(
+DATABASE_URL = os.getenv("DATABASE_URL") or os.getenv(
     "TEST_DATABASE_URL",
     "postgresql+asyncpg://postgres:postgres@localhost:5432/fastapi_toolsets_test",
 )
@@ -149,7 +149,7 @@ async def engine():
 
 
 @pytest.fixture(scope="function")
-async def db_session(engine) -> AsyncSession:
+async def db_session(engine):
     """Create a test database session with tables.
 
     Creates all tables before the test and drops them after.