I build the server side of your product: a clean REST API around your data, with secure login, roles and your business rules. It's tested, documented and ready to deploy, and your front-end developer can start using it from the first day.

This is for you if • You have a web or mobile front end and need the API behind it • Your current backend is slow, fragile or hard to change safely • You need a secure API for partners, customers or internal tools • You're moving logic out of spreadsheets and scripts into a proper service

What you receive • A REST API around your data: create, read, update and delete, plus the actions your app needs • Secure login with access and refresh tokens, and roles so every user sees only what they should • A PostgreSQL database with migrations and sensible indexes • Validation on every input and clear, consistent error responses • Interactive API docs (Swagger and ReDoc) generated from the code • Automated tests, a Docker setup and a setup guide, with the full source code

Options you can add • Performance: Redis caching, pagination and background tasks • Protection: rate limiting, API keys for partners, security headers and an audit log • Resilience: retries, timeouts and circuit breakers for the outside services you call • Integrations: payments, e-mail and third-party APIs • Operations: structured logs, health checks, metrics and a CI pipeline • Versioning: /api/v1 endpoints, so the API can grow without breaking your apps • Deployment: Docker on your server or a cloud platform, behind HTTPS

You tell me what your app does, what data it stores and who uses it.

I send a written plan: endpoints, data model, roles, and what's in and out. Nothing starts until you approve it.

I build it with tests and share the API docs early, so your front end can start in parallel.

We review it together and I fix anything you find.

You receive the code, the docs and the guide, and I help you deploy it.

Proof you can check Try a live API I built: Smart Travel Aggregator combines several travel providers behind one FastAPI service, with JWT login and roles, rate limiting, caching and circuit breakers, and 92% test coverage. It runs on a free server, so the first load can take about 40 seconds. Live API docs: https://smart-travel-aggregator.onrender.com/docs Code: https://github.com/mojtaba-py-code/smart-travel-aggregator

NexusFlow, my largest backend: FastAPI, PostgreSQL with row-level security, background workers, five roles and 38 permissions, with 2,561 automated tests at 90% coverage. https://github.com/mojtaba-py-code/fastapi-postgres-ai-automation-platform

Not included The front end or mobile app interface (see my Full-Stack Web App service), Django or Flask projects, machine-learning model training, and hosting fees (paid directly by you).

Ready to start? Send me a message describing your app and its data, and I'll reply with a plan before you order.