Experienced FastAPI Development ServicesFastAPI
We build production-grade APIs with FastAPI. Ship your MVP in 8-12 weeks at a fixed price.
IRPR builds production FastAPI backends for web apps, mobile APIs, and microservices. We use FastAPI with Pydantic, SQLAlchemy, and async PostgreSQL for high-performance endpoints. Every project includes auto-generated OpenAPI documentation and async I/O for maximum throughput.
Each project ships in 8-12 weeks with code in your repo, CI/CD on GitHub Actions, and AWS or GCP deployment. Pricing is fixed at $80K-$250K depending on scope. All projects include automated testing, monitoring, and a handoff session. We have delivered FastAPI APIs for 50+ clients across 20 industries.
CTOs needing a scalable API platform hire us for async backends that handle thousands of concurrent users. Startup founders use us to launch a SaaS MVP with Stripe integration and user management. Enterprise teams migrate from Flask or Django REST to FastAPI for better performance. Data teams deploy ML inference APIs with FastAPI serving TensorFlow or ONNX models.
Types of software we ship.
REST API Backend
Custom CRUD APIs with FastAPI, Pydantic validation, and async PostgreSQL. Auto-generated Swagger docs included.
Microservices Platform
Distributed system built with multiple FastAPI services, message queues, and Docker orchestration.
Real-time API with WebSockets
Real-time features using FastAPI WebSockets, Redis pub/sub, and async event handling.
GraphQL Gateway
GraphQL API using Strawberry or Ariadne with FastAPI, integrating multiple data sources into one endpoint.
File Upload & Processing API
Async file upload with chunking, processing via Celery workers, and S3 storage.
Authentication & Authorization Service
JWT, OAuth2, or SSO integration with FastAPI. Includes role-based access control and refresh tokens.
Data Aggregation API
Unifies data from 3rd party APIs, databases, and webhooks into a single FastAPI endpoint.
AI/ML Model Serving API
Deploy machine learning models with FastAPI, ONNX, or TensorFlow Serving. Handles batch inference and request queuing.
We build for every business type.
SaaS Platforms
Fintech
Healthcare
Ecommerce
Real Estate
Why FastAPI for your backend
FastAPI delivers async performance and automatic docs out of the box.
FastAPI uses Python type hints to generate OpenAPI specs automatically. This eliminates manual API documentation and reduces integration time by 40%. IRPR has shipped 50+ FastAPI projects with average response times under 20ms.
Our clients see consistent uptime above 99.9%. FastAPI's async capabilities let your backend handle thousands of concurrent requests without blocking. Combined with Pydantic validation, you get automatic request validation and error messages.
What sets IRPR apart
Generic dev shops deliver slow, undocumented APIs. IRPR delivers production FastAPI with async, testing, and docs built-in.
Most agencies use synchronous frameworks like Flask or Django REST. They ship without proper async handling, leading to slow endpoints under load. Manual documentation means your integration team spends weeks debugging.
IRPR builds every API with async dependencies, Pydantic validation, and automated test coverage above 90%. Your API scales without rewrites. We provide auto-generated OpenAPI specs that your frontend and mobile teams can use immediately.
- Synchronous endpoints block under load
- No automatic API docs
- Manual error handling
- No test coverage
- Slow iteration cycles
- Vague hourly billing
- Async endpoints with asyncio
- Auto-generated OpenAPI docs via FastAPI
- Pydantic validation built-in
- 90%+ automated test coverage
- Agile 2-week sprints
- Fixed price from $80K
How we build your FastAPI API
Our process moves from specification to deployment in 8-12 weeks.
We follow a four-phase approach that ensures your API meets performance, security, and scalability goals. Each phase includes client review and sign-off. Our senior engineers handle everything from database design to production deployment.
What ships with your FastAPI project
Every project delivers production-ready code and infrastructure.
You get more than just an API. We provide complete tooling and documentation so your team can deploy, monitor, and extend the system immediately. All deliverables are in your Git repository from day one.
Our standard handoff includes a 2-hour training session for your developers. We explain the architecture, show how to run tests, and demonstrate the monitoring dashboards.
- Source code in your GitHub repo
- OpenAPI/Swagger docs auto-generated
- CI/CD pipeline with GitHub Actions
- Async SQLAlchemy models with migrations
- Pydantic schemas for request/response validation
- Unit and integration tests (90%+ coverage)
- Monitoring and error tracking (Sentry, Datadog)
- Docker compose for local development
- Production deployment guide
- Admin credentials and handoff session
What we ship in this practice.
SaaS Subscription Analytics API
Built a billing analytics API that processes 50M events per month. Reduced report generation from 12 seconds to 0.3 seconds. Tech: FastAPI, PostgreSQL, Redis, Stripe.
Real Estate Property Search API
Implemented MLS data ingestion with async crawling. Achieved 95% latency reduction compared to previous Flask API. Tech: FastAPI, Elasticsearch, AWS SQS.
Healthcare Patient Portal API
HIPAA-compliant FastAPI serving 200 clinics. Handles 10K concurrent users with sub-500ms response times. Tech: FastAPI, PostgreSQL, Auth0, AWS KMS.
Fintech Payment Gateway API
PCI-DSS compliant transaction processing API. Maintained 99.99% uptime over 18 months. Tech: FastAPI, PostgreSQL, Stripe Connect, Datadog.
EdTech Course Management API
Built API for 500K students enrolling in 1000+ courses. Async course enrollment reduced failures by 80%. Tech: FastAPI, MySQL, Redis, Google Cloud.
Ecommerce Recommendation API
Real-time product recommendation engine using collaborative filtering. Increased average order value by 15%. Tech: FastAPI, Redis, TensorFlow Serving.
Why teams hire us.
Fixed price, not hourly
Every FastAPI project gets a fixed quote from the Roadmap phase. No hourly billing or surprise invoices. Average project cost is $80K-$250K.
Senior engineers only
Our team averages 10+ years of Python experience. Every engineer has shipped production FastAPI at scale. No junior developers work on your project.
Async-first design
We use FastAPI's async capabilities for all I/O operations. Your API handles thousands of concurrent requests without thread pool limits. All endpoints are async by default.
Automated testing and CI/CD
Every endpoint gets unit and integration tests. We set up GitHub Actions to run tests on every push. Test coverage is consistently above 90%.
Production monitoring from day one
We integrate Sentry for error tracking and Datadog for performance metrics. You see exactly how your API behaves before launch. Alerts are configured for critical issues.
Full ownership and documentation
You own all source code, infrastructure as code, and API documentation. No lock-in. We provide a handoff session to your team, with recorded walkthroughs.
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.