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      • Team App West
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      • Team Website and Docs
      • Team People and Ops
      • Team Customer Success
    • Compensation
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    • Spending money
    • Progression
    • Training
    • Feedback
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    • Offboarding
      • Product Manager ramp up
    • Merch store
      • Overview
      • Engineering hiring
      • Marketing hiring
      • Operations hiring
      • Design hiring
      • Exec hiring
      • Developing locally
      • Tech stack
      • Project structure
      • How we review PRs
      • Frontend coding
      • Backend coding
      • Support hero
      • Feature ownership
      • Releasing a new version
      • Bug prioritization
      • Event ingestion explained
      • Making schema changes safely
      • How to optimize queries
      • How to write an async migration
      • How to run migrations on PostHog Cloud
      • Working with ClickHouse materialized columns
      • Deployments support
      • Working with cloud providers
      • Breaking glass to debug PostHog Cloud
      • Developing the website
      • MDX setup
    • Shipping things, step by step
    • Feature flags specification
    • Setting up SSL locally
    • Tech talks
    • Overview
    • Product metrics
    • User feedback
    • Scale features prioritization
    • Paid features
    • Releasing as beta
    • Overview
    • Overview
    • Personas
    • Testimonials
    • Value propositions
      • Content & SEO
      • Sponsorship
      • Paid ads
      • Email
      • Press
    • Growth strategy
    • Customer support
    • Inbound sales model
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      • Managing our CRM
      • YC onboarding
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Tech stack

Last updated: Mar 15, 2022

On this page

  • Frontend
  • Backend
  • Testing
  • Additional tools

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
  • 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

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

Questions?

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Project structure

Note: This page refers to our main product repository , not our website. Directory tree .github Directory for our GitHub actions and templates for issues and pull requests. .platform Scripts for deploying to Platform.sh. bin Executable shell scripts for various purposes, most notably building, testing, and running PostHog. cypress Hosts our Cypress tests. When writing tests that use Cypress, you will mostly be working on the integration/ subdirectory. Remember that you should always be…

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