Engineering Handbooks & Tech Stacks (12)

Companies that publish detailed engineering handbooks or dedicated documentation of their tech stack, architecture decisions, and tooling choices.
Company
URL
Stack Highlights
PostHog
posthog.com/handbook/engineering/stack
Frontend: React, Redux, Kea, Ant Design. Backend: Django, Rust. Data: PostgreSQL, ClickHouse, Redis, Kafka. Orchestration: Celery, Temporal, Dagster. CI: GitHub Actions, Playwright, Pytest.
Infobip
GitBook handbook
Full engineering handbook: tech stack & architecture, code & deploy practices, observability, self-managed teams, career dev. 40+ datacenters worldwide.
Wise
2025 Stack Update
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.
Artsy
GitHub README
React, Relay, TypeScript, GraphQL, Palette design system. Open Source by Default.
Figma
Engineering blog · Values
Frontend: React, TypeScript, C++. Backend: Ruby, Go, TypeScript. LiveGraph (custom real-time DB).
Microsoft ISE
Engineering Playbook · GitHub
Open-source playbook. React, TypeScript recommended. Covers design reviews, CI/CD, observability, testing.
Raycast
Public docs
Vue.js, Gridsome, Vercel. Node.js, Express, Heroku. Linear, GitHub, Slack, Notion.
dwyl
GitHub
PETAL stack: Phoenix, Elixir, Tailwind, Alpine.js, LiveView. PostgreSQL. Detailed rationale with diagrams.
Spotify
Engineering blog · Backstage
Created Backstage (CNCF internal developer portal). Tech Radar plugin. Core principle: "The fewer technologies we are world class on, the faster we get."
Canva
canva.dev/engineering
Backend: Java, Kotlin, Python, Scala. Frontend: React, TypeScript. Data: Snowflake (25+ PB, 90M queries/month).
Uber
Tech Stack Part I · Part II
Python, Go, Java, Node.js. Schemaless (custom on MySQL), Riak, Cassandra. Docker, Mesos, Aurora.
Mercury Works
GitHub Pages
Dev handbook: culture, code style, UX design, front-end, back-end.
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).