Backend API & System Architecture

## APIs That Last The difference between a backend that works and one that scales is architecture. I design and build backend systems with the long term in mind — clean separation of concerns, proper error handling, and security built in from the start. ### What I Deliver - **REST API design** — clear contracts, proper status codes, versioning - **Authentication & authorisation** — JWT, refresh tokens, RBAC - **CQRS architecture** — for complex domains and high-throughput systems - **Data validation & sanitisation** — at every layer - **Database design** — normalised schemas, migrations, performance indexing ### Technology - **NestJS** — enterprise-grade Node.js framework with dependency injection - **.NET** — for high-performance, strongly-typed enterprise backends - **Prisma ORM** + **PostgreSQL** — type-safe queries, clean migrations - **Azure DevOps** — CI/CD pipelines for automated testing and deployment ### Security Input validation, parameterised queries, rate limiting, CORS configuration, and secure credential management — your API won't become a liability. ## Ideal For - Startups that need a solid API backbone - Teams replacing a fragile legacy backend - Businesses adding a backend to an existing frontend