Best FastAPI Development AgencyFastAPI Development
We build production FastAPI APIs for startups and enterprises. Get a fixed-price quote in week 2 and ship in 8-12 weeks.
IRPR builds production-grade APIs using FastAPI, Python's fastest web framework. We use Pydantic for data validation, asyncio for concurrency, and SQLAlchemy for database access to ship secure, high-performance APIs that handle 10,000+ requests per second.
Every FastAPI project ships in 8-12 weeks with a fixed price between $80K and $250K. We include automated API documentation (Swagger/ReDoc), CI/CD pipelines, Docker containerization, and a full security audit. Compliance standards like SOC 2 and PCI-DSS are baked in from day one.
CTOs needing to scale their API layer hire us. Product teams requiring a fast MVP for a new SaaS idea hire us. Fintech and healthcare companies that need asynchronous, low-latency APIs with strict compliance hire us.
Types of software we ship.
REST API Development
Build CRUD REST APIs with FastAPI, Pydantic schemas, and PostgreSQL. Includes auto-generated OpenAPI docs.
GraphQL API
Implement a GraphQL gateway with Strawberry or Ariadne on top of FastAPI for flexible data queries.
Real-time WebSocket API
Add real-time features using FastAPI WebSocket support with Redis Pub/Sub for chat, notifications, or live updates.
Async Microservices
Break monolithic apps into async microservices using FastAPI, RabbitMQ, and Docker Swarm for independent scaling.
API Gateway
Create a central API gateway with FastAPI that routes, rate-limits, and authenticates requests to multiple backend services.
Background Task API
Offload heavy processing with Celery workers triggered by FastAPI endpoints. Handles 1000+ concurrent tasks.
Data Processing Pipeline
Build ETL pipelines with FastAPI, Pandas, and PostgreSQL for real-time data ingestion and transformation.
Mobile Backend API
Power mobile apps with a FastAPI backend optimized for battery life and low bandwidth using gzip compression and pagination.
We build for every business type.
Financial Services
Healthcare
E-commerce
SaaS Platforms
Logistics & Supply Chain
Why choose FastAPI for your API needs?
FastAPI is 60% faster than Flask for async endpoints and scales to thousands of concurrent connections.
FastAPI leverages Python 3.10+ type hints and Pydantic for automatic request validation and serialization. This means your API docs are always in sync with code, and errors are caught at compile time not runtime.
IRPR has shipped over 200 FastAPI projects across 50 countries. Our clients see 40% less code compared to Flask and 2x faster development cycles due to built-in dependency injection and async support.
IRPR vs. Generic Dev Shops
Most agencies treat FastAPI like any other framework. We treat it as the core of our async architecture.
Generic shops write synchronous code and call it FastAPI. They skip Pydantic best practices, ignore async patterns, and deliver APIs that block under load.
IRPR assigns senior Python engineers who have built production FastAPI apps for fintech, healthcare, and SaaS. We write pure asynchronous handlers, optimize query performance with SQLAlchemy 2.0, and include load testing in every contract.
- Uses sync I/O blocking the event loop
- No Pydantic v2 optimization
- Delivers in 16-24 weeks
- Hourly billing with scope creep
- No CI/CD or containerization included
- Code ownership unclear
- Pure async with asyncio and Uvicorn workers
- Pydantic v2 with custom validators for performance
- Delivers in 8-12 weeks fixed price
- Fixed price from week 2, no surprises
- CI/CD (GitHub Actions), Docker, and Sentry included
- Full code ownership from day one
Our FastAPI Development Process
We follow a four-phase process that guarantees on-time delivery and production-grade quality.
Every project starts with a two-week Roadmap phase where we define endpoints, data models, and infrastructure. You get a fixed price and a detailed timeline before any coding begins.
During the Build phase we work in two-week sprints with continuous demos. The final two weeks are dedicated to performance testing, security scanning, and deployment automation.
What ships with your FastAPI project
Every deliverable is production-ready with no loose ends.
When we finish a FastAPI project, you get a complete, deployable system. Nothing is left for you to figure out.
- Source code in your private GitHub or GitLab repo
- Automated OpenAPI documentation (Swagger UI + ReDoc)
- CI/CD pipeline with GitHub Actions or GitLab CI
- Docker Compose and Dockerfile for local and production
- Sentry error tracking and logging configuration
- Load testing results (Locust report with 10k+ simulated users)
- Deployment scripts for AWS ECS, Google Cloud Run, or Azure App Service
- Postman collection with all endpoint examples
- API security audit report (OWASP top 10 coverage)
- Database migrations with Alembic and seed scripts
What we ship in this practice.
Payment Gateway API for Fintech
Built a PCI-DSS compliant payment gateway using FastAPI, Stripe Connect, and PostgreSQL. The API processes 10,000 transactions per second with sub-50ms latency. Reduced manual reconciliation from 4 hours to 10 minutes daily.
Real-time Chat Backend for EdTech
Developed a WebSocket-based chat API with FastAPI, Redis Pub/Sub, and PostgreSQL. Handles 50,000 concurrent connections with message delivery in under 100ms. Enabled real-time tutoring sessions for 2 million users.
Product Catalog API for E-commerce
Created a high-performance catalog API with FastAPI, Elasticsearch, and PostgreSQL. Supports 500,000 products with full-text search returning results in under 200ms. Increased product discovery by 35%.
FHIR API for Healthcare Platform
Built a HIPAA-compliant FHIR R4 API with FastAPI, HAPI FHIR, and PostgreSQL. Processes 5 million patient records with full audit logging. Reduced integration time for partner hospitals from 6 months to 6 weeks.
Logistics Tracking API
Developed a real-time tracking API using FastAPI, WebSockets, and Redis. Handles 1 million GPS updates per day from delivery vehicles. Reduced delivery ETAs error from 15 minutes to under 2 minutes.
Multi-tenant SaaS API Backend
Built a multi-tenant API with FastAPI, SQLAlchemy row-level security, and Stripe subscription management. Supports 500+ tenants with data isolation. Enabled the client to launch their SaaS product in 10 weeks instead of 8 months.
Why teams hire us.
Fixed Price, No Hourly Billing
Every FastAPI project gets a fixed quote after the Roadmap phase (week 2). You never see a surprise invoice. The price you see is the price you pay.
Senior Python Developers Only
Our engineers have 8+ years of Python experience and have shipped FastAPI apps in production since version 0.1. We don't train juniors on your dime.
Asynchronous by Default
We write pure async handlers with asyncio and Uvicorn. Your API handles thousands of concurrent requests without blocking. No sync-to-async hacks.
Built-in API Documentation
Every endpoint gets automatic Swagger and ReDoc docs thanks to FastAPI and Pydantic. Your frontend team or external partners can start integrating immediately.
99.9% Uptime Guarantee
We design for failure with health checks, auto-scaling, and database replication. Our deployed FastAPI apps achieve 99.9% uptime as measured by third-party monitoring.
Full Code Ownership
You own every line of code from day one. There is no licensing, no hidden subscriptions, no lock-in. The repository is yours to deploy, modify, or sell.
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.
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