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Technical Documentation Examples - API Docs and ADRs

Discover technical documentation examples: API documentation, ADRs, runbooks and developer guides. Documentation that keeps working.

Good technical documentation speeds up onboarding and reduces bus factor. API docs, ADRs (Architecture Decision Records) and runbooks are the backbone of a maintainable system.

OpenAPI-first API documentation

A fintech built API docs from OpenAPI spec. The spec was the source of truth; client SDKs and mock servers were generated. Docs stayed in sync.

  • OpenAPI as single source of truth
  • Automated SDK generation
  • Interactive docs via Swagger UI

ADR repository for architecture decisions

A scale-up documented architecture decisions in ADRs. Each major decision got context, options and consequences. New developers read ADRs for quick understanding.

  • One ADR per decision
  • Context, decision, consequences
  • Git history as evolution log

Key takeaways

  • Documentation close to the code stays most up-to-date.
  • ADRs preserve the ’why’ of architecture choices.
  • Runbooks with steps for incidents speed up response.

How MG Software can help

MG Software documents what we build. OpenAPI specs, ADRs and runbooks are part of our deliverables.

Further reading

ExamplesMulti-tenant Architecture Examples - Inspiration & Best PracticesMicroservices Architecture Examples - Inspiration & Best PracticesAPI Documentation Template - Write Professional API DocsMermaid vs D2: Which Should You Choose?

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Frequently asked questions

OpenAPI/Swagger, Redoc, Stoplight. Generate from code or code from spec — choose one direction.
Integrate in CI: docs-build fails on schema change. Code-first or spec-first, but automate.

Which tools for API documentation?

OpenAPI/Swagger, Redoc, Stoplight. Generate from code or code from spec — choose one direction.

How do I keep documentation up-to-date?

Integrate in CI: docs-build fails on schema change. Code-first or spec-first, but automate.

Want to build something like this?

We bring your idea from concept to launch.

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