# Engineering Handbooks & Tech Stacks (12)

Companies that publish detailed engineering handbooks or dedicated documentation of their tech stack, architecture decisions, and tooling choices.

<table id="bkmrk-companyurlstack-high"><thead><tr><th>Company</th><th>URL</th><th>Stack Highlights</th></tr></thead><tbody><tr><td>**PostHog**</td><td>[posthog.com/handbook/engineering/stack](https://posthog.com/handbook/engineering/stack)</td><td>**Frontend:** React, Redux, Kea, Ant Design. **Backend:** Django, Rust. **Data:** PostgreSQL, ClickHouse, Redis, Kafka. **Orchestration:** Celery, Temporal, Dagster. **CI:** GitHub Actions, Playwright, Pytest.</td></tr><tr><td>**Infobip**</td><td>[GitBook handbook](https://infobipengineering.gitbook.io/handbook)</td><td>Full engineering handbook: tech stack &amp; architecture, code &amp; deploy practices, observability, self-managed teams, career dev. 40+ datacenters worldwide.</td></tr><tr><td>**Wise**</td><td>[2025 Stack Update](https://medium.com/wise-engineering/wise-tech-stack-2025-update-d0e63fe718c7)</td><td>**Backend:** Java, Kotlin. **Frontend:** Next.js (CRAB), React. **Mobile:** Kotlin/Compose, Swift, KMP. **Data:** MariaDB, PostgreSQL, MongoDB, Redis, Snowflake, Iceberg. **Infra:** K8s (RKE2), Terraform, ArgoCD, Envoy. **ML:** SageMaker, MLflow, Ray Serve. **LLMs:** Claude, Bedrock, Gemini. **Observability:** LGTM stack.</td></tr><tr><td>**Artsy**</td><td>[GitHub README](https://github.com/artsy/README)</td><td>React, Relay, TypeScript, GraphQL, Palette design system. Open Source by Default.</td></tr><tr><td>**Figma**</td><td>[Engineering blog](https://www.figma.com/blog/engineering/) · [Values](https://www.figma.com/blog/figmas-engineering-values/)</td><td>**Frontend:** React, TypeScript, C++. **Backend:** Ruby, Go, TypeScript. LiveGraph (custom real-time DB).</td></tr><tr><td>**Microsoft ISE**</td><td>[Engineering Playbook](https://microsoft.github.io/code-with-engineering-playbook/) · [GitHub](https://github.com/microsoft/code-with-engineering-playbook)</td><td>Open-source playbook. React, TypeScript recommended. Covers design reviews, CI/CD, observability, testing.</td></tr><tr><td>**Raycast**</td><td>[Public docs](https://raycast.com/jobs)</td><td>Vue.js, Gridsome, Vercel. Node.js, Express, Heroku. Linear, GitHub, Slack, Notion.</td></tr><tr><td>**dwyl**</td><td>[GitHub](https://github.com/dwyl/technology-stack)</td><td>PETAL stack: Phoenix, Elixir, Tailwind, Alpine.js, LiveView. PostgreSQL. Detailed rationale with diagrams.</td></tr><tr><td>**Spotify**</td><td>[Engineering blog](https://engineering.atspotify.com/) · [Backstage](https://backstage.io/)</td><td>Created Backstage (CNCF internal developer portal). Tech Radar plugin. Core principle: "The fewer technologies we are world class on, the faster we get."</td></tr><tr><td>**Canva**</td><td>[canva.dev/engineering](https://www.canva.dev/blog/engineering/)</td><td>**Backend:** Java, Kotlin, Python, Scala. **Frontend:** React, TypeScript. **Data:** Snowflake (25+ PB, 90M queries/month).</td></tr><tr><td>**Uber**</td><td>[Tech Stack Part I](https://www.uber.com/us/en/blog/tech-stack-part-one-foundation/) · [Part II](https://www.uber.com/blog/uber-tech-stack-part-two/)</td><td>Python, Go, Java, Node.js. Schemaless (custom on MySQL), Riak, Cassandra. Docker, Mesos, Aurora.</td></tr><tr><td>**Mercury Works**</td><td>[GitHub Pages](https://mercuryworks.github.io/developers-handbook/)</td><td>Dev handbook: culture, code style, UX design, front-end, back-end.</td></tr></tbody></table>

**Best for stack documentation:** PostHog (dedicated /engineering/stack page), Wise (periodic Tech Stack Update posts with 60+ technologies), Infobip (full GitBook engineering handbook), Uber (two-part blog series).