FastAPI Development CompanyDevelopment Company
Build modern, async APIs with Python FastAPI. We ship production-grade backends in 12 weeks with fixed pricing.
IRPR is a FastAPI development company that builds high-performance APIs and backend systems for startups and enterprises. We use Python FastAPI with asyncio, Pydantic for validation, and SQLAlchemy for database access. Every API is designed for speed: async endpoints, automatic OpenAPI docs, and type safety.
We ship production-ready backends in 12 weeks on average. Fixed pricing starts at $80K for a full API with authentication, database, and deployment. We handle compliance for HIPAA, PCI-DSS, and SOC 2. Our code includes unit tests with pytest and integration tests for every endpoint.
Founders hire us to build their MVP API and get to market fast. Engineering leads hire us to rebuild legacy REST APIs into FastAPI microservices. CTOs hire us to add real-time data processing with WebSocket endpoints. Product owners hire us to integrate third-party APIs like Stripe, HubSpot, or Salesforce.
Types of software we ship.
REST API Backend
Build a complete RESTful API with FastAPI, including authentication, rate limiting, and automatic Swagger docs. Integrates with PostgreSQL or MongoDB.
Microservices Architecture
Decompose a monolith into async FastAPI microservices with message queues like RabbitMQ or Redis Streams. Each service scales independently.
Real-Time WebSocket API
Implement bi-directional real-time communication using FastAPI WebSockets. Use for chat, live dashboards, or collaborative tools. Handles 10K+ concurrent connections.
GraphQL API with FastAPI
Combine FastAPI with Strawberry GraphQL to build a flexible data layer. Supports queries, mutations, and subscriptions with async resolvers.
Machine Learning API
Serve ML models with FastAPI. Use ONNX or TensorFlow Serving for inference. Includes async data preprocessing and batch prediction.
File Upload and Processing API
Accept large file uploads (video, images, CSV) with streaming. Process async with Celery or AWS Lambda triggers. Store in S3 or GCS.
Third-Party Integration API
Wrap external APIs (Stripe, Salesforce, HubSpot) into a unified FastAPI layer. Add caching, retry logic, and webhook handling.
Admin Dashboard Backend
Build a FastAPI backend for an admin panel with role-based access, audit logs, and search endpoints. Connects to React or Vue frontend.
We build for every business type.
SaaS Platforms
Data-Heavy Applications
Ecommerce Backends
Fintech Services
Healthcare Platforms
Why a FastAPI development company delivers faster APIs
FastAPI's async nature and automatic validation cut development time by 40% compared to Flask or Django REST Framework.
IRPR has built 200+ backend projects, and our FastAPI specialists use the framework's full potential. With async endpoints, your API handles thousands of concurrent requests without blocking. We add Pydantic schemas for automatic request validation and OpenAPI docs that stay in sync with the code.
A typical FastAPI backend from IRPR includes CORS headers, JWT authentication, database migrations with Alembic, and deployment to AWS ECS or Kubernetes. We set up CI/CD with GitHub Actions so every PR runs tests and linters. You get a production-ready API in 8-12 weeks.
The difference between generic dev shops and a FastAPI specialist
Most agencies use Flask or Django and ignore async patterns. IRPR lives in FastAPI.
Generic shops treat FastAPI like another Flask project. They skip async endpoints, write blocking code in routes, and ignore Pydantic validation. The result is a slow API that needs rewrites when traffic grows.
IRPR builds with async from day one. We use starlette middleware, dependency injection, and background tasks with Celery. Every API gets concurrency benchmarks and load testing with locust. You get a backend that scales without surprise costs.
- Sync endpoints that block I/O
- No OpenAPI docs or outdated
- Django ORM without async support
- Manual deployment scripts
- No load testing
- Hourly billing, scope creep
- Async endpoints with asyncio
- Auto-generated OpenAPI docs via Pydantic
- SQLAlchemy 2.0 with async sessions
- CI/CD with GitHub Actions, Docker, ECS
- Load testing with locust in every project
- Fixed price, no surprises, 12 weeks
How we build your FastAPI backend in 4 phases
Our process turns your idea into a production API with tests, docs, and deployment.
Every project follows our Idea-Product-Release framework adapted for FastAPI. Phase 1 (Idea) takes 1 week: we define endpoints, data models, and API contracts. Phase 2 (Roadmap) takes 1 week: we create a detailed plan with mockups and pricing.
Phase 3 (Product) takes 8-10 weeks: we code the API, write tests, set up CI/CD, and deploy to staging. Phase 4 (Release) takes 1 week: we perform security audits, load testing, and production deployment. You own all code and can take over at any time.
What ships with every FastAPI backend
You get a complete, production-ready backend. No missing pieces.
Our FastAPI projects include everything needed to run in production. We don't hand over unfinished code. Every deliverable is tested, documented, and live on a staging server before final sign-off.
- Source code in your GitHub repo
- CI/CD pipeline with GitHub Actions
- Dockerized application and docker-compose
- Test suite with pytest (unit + integration)
- OpenAPI/Swagger UI docs (auto-generated)
- Postman collection for manual testing
- Load test results with locust
- Deployment scripts for AWS ECS or Heroku
- Monitoring setup with Sentry error tracking
- Runbook with environment variables and commands
What we ship in this practice.
Real-time notification microservice for a SaaS
Built a WebSocket-based notification service with FastAPI and Redis Pub/Sub. Handles 50K concurrent connections. Reduced notification delivery latency from 2 seconds to 200ms. Tech stack: FastAPI, Redis, AWS ECS, Sentry.
Payment processing API for a fintech startup
Created a PCI-DSS compliant payment API with FastAPI and Braintree. Supports one-time charges, subscriptions, and refunds. Processed $2M in transactions in the first month. Tech stack: FastAPI, Braintree, PostgreSQL, Docker.
ML inference API for a healthcare analytics platform
Built a FastAPI endpoint that runs a diabetes risk prediction model using ONNX runtime. Processes 1000 inferences per second. HIPAA compliant with encrypted payloads. Tech stack: FastAPI, ONNX, AWS Lambda, S3.
Product catalog API for an ecommerce marketplace
Developed a search and filter API with FastAPI and Elasticsearch. Supports faceted search, autocomplete, and personalized recommendations. Reduced page load time by 60%. Tech stack: FastAPI, Elasticsearch, Redis, Stripe Connect.
Real estate MLS data ingestion API
Designed an async data pipeline that pulls MLS listings from 5 providers via FastAPI and Celery. Handles 10K updates per minute. Integrated with a React dashboard. Tech stack: FastAPI, Celery, PostgreSQL, GraphQL (Strawberry).
Student enrollment API for an edtech platform
Built a FastAPI backend for course enrollment, grade tracking, and communication. Handles 5000 concurrent users during peak hours. FERPA compliant with audit logs. Tech stack: FastAPI, PostgreSQL, Firebase Auth, S3.
Why teams hire us.
FastAPI specialists, not generalists
Every engineer at IRPR has built at least 5 FastAPI projects in production. We know async patterns, dependency injection, and performance optimization. No learning curve on your dime.
Fixed price, not hourly
We quote a fixed price after the Roadmap phase. No hourly billing, no surprise invoices. You know the cost before we write a single line of code. Typical FastAPI projects start at $80K.
Production-ready in 12 weeks
From API design to live deployment in 8-12 weeks. We ship with tests, CI/CD, monitoring, and docs. Your API goes live fast with real code, not proof-of-concept spaghetti.
Full code ownership
You own every line of code. We put it in your repository from day one. No licensing fees, no ongoing royalties, no lock-in. You can hire any developer to maintain it later.
Compliance built in (HIPAA, PCI-DSS, SOC 2)
We build APIs that meet regulatory standards from the start. Healthcare APIs use encrypted payloads and audit logging. Fintech APIs pass PCI scans. Edtech APIs follow FERPA rules.
Async-first performance
We use asyncio and async database drivers (asyncpg, databases) to avoid blocking I/O. Your FastAPI backend can handle 10K+ requests per second on a single instance. We load test every endpoint with locust.
Idea → Roadmap → Product → Release.
Every engagement runs through the same four-stage pipeline. Predictable by design.
Questions clients ask first.
Related services and industries.
Ready to build? Let's talk.
30-minute discovery call. No deck. We'll tell you honestly what it takes, how long, and how much.