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API development and documentation

An API designed to be easy to consume: consistent routes, secure authentication, understandable errors, and documentation that answers the question before it is asked.

Technologies

  • Next.js
  • TypeScript
  • PostgreSQL
  • REST
  • Zod

The problem

An undocumented API costs everyone who uses it time, and vague error messages turn every new integration into hours of debugging.

The solution

I build the API to a clear contract: consistent routes, authentication and permissions, rate limits, and errors that explain what happened — with documentation you can try directly.

What's included

  • API route design
  • Authentication and permissions
  • Rate limiting
  • Interactive documentation
  • API versioning
  • Test environment

Features

  • Consistent REST conventions
  • Input validation
  • Clear error messages
  • Pagination and filtering
  • Webhooks
  • Request logging

Who it's for

  • Companies connecting several systems
  • Anyone exposing data to partners
  • Mobile apps needing a backend

Use cases

  • Backend for a mobile app
  • Integration between two systems
  • Partner API
  • Internal data service

How it's delivered

  1. 01

    Analysis

    Requirements and scope are pinned down before a line is written.

  2. 02

    Design

    System architecture, database design and user interfaces.

  3. 03

    Development

    Incremental delivery with regular updates you follow from your account.

  4. 04

    Testing & launch

    Testing, deployment, code handover and post-launch support.

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Is this the right fit for your project?