02service
REST & GraphQL APIs
Well-structured backends with NestJS or Express: documented, tested and ready to scale.
A good API is a contract your team can rely on. I design and build backends that are predictable, documented and tested — the kind frontend developers enjoy working with.
Why it matters
A contract, not a guess
OpenAPI or GraphQL schemas are written first and become the single source of truth — frontend and mobile teams build against them in parallel.
Tested where it hurts
Auth flows, permissions and money-touching endpoints get integration tests, so refactoring later doesn't feel like defusing a bomb.
Ready for load
Pagination, caching hooks and rate limiting are designed in from the start — the API that works in a demo keeps working with real traffic.
What you get
- 01REST or GraphQL API design and implementation
- 02Database schema with MongoDB or PostgreSQL
- 03JWT auth, roles and rate limiting
- 04OpenAPI / GraphQL docs and integration tests
Technologies I use
NestJSExpressGraphQLMongoDBPostgreSQLJWTOpenAPI
How we'll work together
- 01
Understand
We talk through the goal, the users and the constraints — before any code.
- 02
Plan
A clear scope with honest estimates: what ships first, what can wait.
- 03
Build
Short iterations with visible progress. You see the product grow week by week.
- 04
Ship & support
Production deploy, monitoring and a codebase your next developer will thank you for.
Frequently asked questions
REST or GraphQL — which should we pick?
REST for public or simple resource-based APIs; GraphQL when many clients need flexible views of the same data. I'll recommend one for your case and explain the trade-off in plain terms.
How do you document the API?
Machine-readable first: an OpenAPI spec or GraphQL SDL, generated docs, and a Postman collection your team can run immediately.
Can you add an API on top of an existing database?
Yes — I map the existing schema, wrap it in a clean typed layer and isolate legacy quirks behind the contract so clients never see them.