APIs & Backend Systems
REST and GraphQL APIs designed to be integrated against — versioned contracts, clean architecture, and reliability that holds under real traffic.
What I build
The part of the product your customers never see and cannot tolerate being down: REST and GraphQL APIs, authentication and permissions, background jobs, webhooks, payment integrations, and the data layer underneath all of it.
I design APIs to be integrated against by someone who is not me. Versioned endpoints, predictable error shapes, and contracts agreed and documented before either side is built, so the client and server teams can proceed in parallel instead of blocking each other.
How I work
Clean architecture applied with judgement rather than as decoration. Business rules stay independent of the framework and the database, which is what makes a system testable and what turns swapping a payment provider into a contained change instead of a rewrite.
Every endpoint ships with validation at the boundary, authorisation enforced server-side, and logging you can genuinely debug from at three in the morning. Sensitive fields are encrypted at rest with AES-256-GCM where the data warrants it.
What you get
- A documented API surface your web, mobile and partner teams can build against without asking me questions.
- Automated tests over the paths that carry money, permissions and personal data.
- Database schemas with real constraints and indexes, tuned against the queries you will actually run.
- Queues, caching and rate limiting sized to your traffic using Redis, rather than sized by guesswork.
- Integrations handled end to end: payment gateways, third-party APIs, and webhooks with retries and idempotency.
The stack
Node.js with NestJS or Express, PHP with Laravel, and TypeScript throughout. PostgreSQL, MySQL, MongoDB and SQL Server, with Prisma where it earns its place, and Redis for cache, queues and sessions.
A good fit if
Your frontend is blocked on a backend nobody owns, your API grew organically and can no longer be changed safely, or you are starting a product and want the contract right before three teams build on top of it.