High-performance API development with FastAPI
FastAPI is our go-to framework for building modern, fast and reliable APIs. Native async/await support, automatic data validation with Pydantic, OpenAPI documentation generated on its own: it's the ideal tool when API performance and quality matter.
We use it for microservices, real-time integrations, mobile app and React SPA backends, and to cleanly expose the data of an existing platform. Where a Django monolith hits its throughput limits, a dedicated FastAPI service takes over without rewriting the whole application.
Based in Brussels, we design documented, tested and secure FastAPI APIs (JWT authentication, permission management), connected to PostgreSQL and ready to scale. They integrate naturally with our Python platforms and your existing tools.
Why FastAPI
Async performance
Native async/await support to absorb a large number of concurrent requests. Ideal for APIs hit by mobile apps, SPAs or other services.
Pydantic validation
Incoming and outgoing data is validated and typed automatically. Fewer bugs, clear errors, a reliable API contract from day one.
Native OpenAPI docs
Interactive documentation generated automatically from the code. Your front-end teams and partners explore the API without waiting for hand-written docs.
Microservices & integrations
Lightweight, independently deployable services, perfect for splitting a monolith, exposing data or orchestrating real-time processing.
They trust us
Python & API projects we've delivered
Frequently asked questions
FastAPI when the API is a standalone, performance-oriented async service: microservice, mobile backend, real-time integration. Django REST Framework when the API lives inside an existing Django application and reuses its models and admin. We choose based on context — and both can coexist behind a single authentication layer.
Whenever throughput, latency or async matter: heavily-used APIs, concurrent processing, mobile app or SPA backends, gateways between systems. FastAPI is also excellent for cleanly exposing a machine learning model or an AI agent in production.
Yes. FastAPI is used in production by major platforms. We deliver tested, documented, monitored (Grafana), containerized (Docker) services deployed with async workers. Pydantic validation and typing significantly reduce runtime errors.
JWT or OAuth2 authentication, fine-grained permissions, rate limiting, strict input validation and controlled CORS. We apply the same security standards as on our Django applications.
Need a fast, reliable API?
Microservice, mobile backend or real-time integration — let's talk about your API. FastAPI is our tool of choice for high performance.