posthog.com/contents/handbook/engineering/stack.md

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Tech stack	Docs	true

Note: This page refers to our main product repository, not our website.

Frontend

• Web framework/library: React
• State management: Redux + Kea
• Layout/components: Ant Design

Backend

• Framework: Django
• High scale services: Rust
• Databases: PostgreSQL and ClickHouse
• Task queue/event streaming: Redis and Apache Kafka
• Task Worker: Celery

Testing

• Frontend E2E tests: Cypress
• Backend tests: Pytest and Django's built-in test suite

Additional tools

• CI/CD: GitHub Actions
• Containerization: Docker and Docker Compose
• Linter (frontend): ESLint
• Formatter (backend): Black