Expert FastAPI Development AgencyDevelopment Agency
We build high-performance APIs with FastAPI and Python. 8-12 week MVPs with fixed pricing and full ownership.
IRPR is an expert FastAPI development agency. We build RESTful and async APIs with FastAPI, Python 3.12, Pydantic, SQLAlchemy, and PostgreSQL. Every API is documented with OpenAPI and tested with pytest.
We ship production-ready APIs in 8-12 weeks. Pricing is fixed from $80K to $250K per project. We handle compliance for HIPAA, PCI-DSS, and SOC 2. You get full source code ownership.
Startup CTOs hire us to build their backend from scratch. Enterprise engineering teams hire us to migrate legacy Django or Flask apps to FastAPI. SaaS founders hire us to build subscription APIs with Stripe integration.
Types of software we ship.
RESTful API development
Build CRUD APIs with FastAPI, Pydantic models, and PostgreSQL. Includes JWT auth and rate limiting.
Async microservices
Deploy event-driven services using FastAPI with Celery, Redis, and RabbitMQ for background tasks.
GraphQL API development
Combine FastAPI with Strawberry or Graphene for GraphQL endpoints with real-time subscriptions.
WebSocket API development
Build real-time features like chat, live notifications, and data streaming with FastAPI WebSockets.
API gateway and proxy
Create a unified API gateway with FastAPI that routes to multiple backend services with auth and logging.
Data pipeline API
Expose ETL pipelines as FastAPI endpoints. Integrate with Apache Airflow and Snowflake for analytics.
Machine learning API
Serve ML models using FastAPI with ONNX or TensorFlow Serving. Includes async inference and caching.
Third-party API integration
Wrap external APIs (Stripe, Salesforce, HubSpot) into a unified FastAPI interface with retry logic and caching.
We build for every business type.
SaaS and platform companies
Fintech and payments
Healthcare and life sciences
Ecommerce and retail
Media and content platforms
Why choose an expert FastAPI development agency
FastAPI is fast, but building production-grade APIs requires deep expertise in async patterns, database optimization, and deployment automation.
IRPR has shipped over 200 products using FastAPI. Our senior engineers have built APIs that handle 10,000+ requests per second. We use Pydantic for strict data validation and SQLAlchemy for async database access. Every API is deployed with Docker on AWS ECS or Kubernetes.
We write automated tests with pytest and achieve 95%+ code coverage. We set up CI/CD pipelines on GitHub Actions that run tests, linting, and security scans. Your API ships with Sentry error tracking and Datadog monitoring from day one.
IRPR vs generic dev shops
Most agencies treat FastAPI as just another Python framework. We treat it as a production platform with async, type safety, and auto-documentation.
Generic shops often deliver FastAPI code that ignores async patterns, uses blocking database calls, and lacks proper error handling. They skip OpenAPI documentation and leave you with untested endpoints. You end up paying for rewrites.
IRPR builds FastAPI APIs the right way. We use async SQLAlchemy sessions, Pydantic for request validation, and structured logging. Every endpoint has OpenAPI docs. We set up health checks, graceful shutdowns, and connection pooling. Your API is production-ready at launch.
- Blocking database calls in async endpoints
- No OpenAPI documentation
- Low test coverage (under 50%)
- No CI/CD pipeline
- No error monitoring
- Hourly billing with scope creep
- Full async SQLAlchemy with connection pooling
- Auto-generated OpenAPI docs with Swagger UI
- 95%+ code coverage with pytest
- CI/CD on GitHub Actions with security scans
- Sentry error tracking and Datadog monitoring
- Fixed price with no surprise invoices
Our FastAPI development process
We follow a 4-phase process to build your FastAPI API in 8-12 weeks with fixed pricing.
Phase 1 is the Roadmap. In week 2, we deliver a detailed project plan with API endpoints, data models, and deployment architecture. You get a fixed price quote. No surprises.
Phases 2-4 are Product, Release, and Growth. We build the API iteratively, deploy to staging after each sprint, and ship to production with monitoring and documentation.
What ships with your FastAPI project
Every FastAPI project from IRPR includes production-grade infrastructure and documentation.
We don't hand over a zip file and walk away. Your project includes a fully automated CI/CD pipeline, monitoring dashboards, and runbooks. Your team can deploy and maintain the API without IRPR.
You get 30 days of post-launch support. We fix any bugs and help your team ramp up. After that, we offer maintenance retainer if needed.
- Source code in your private GitHub repository
- CI/CD pipeline on GitHub Actions with test, lint, security scan
- Docker Compose and Dockerfile for local development
- Production Docker images and Helm charts for Kubernetes
- Sentry error tracking with alerting
- Datadog or Grafana dashboards for API metrics
- OpenAPI documentation with Swagger UI and ReDoc
- Runbook with deployment steps, rollback, and scaling
- Load testing results with k6 or Locust
What we ship in this practice.
Subscription billing API for a SaaS startup
Built a FastAPI billing API that handles 10,000+ subscription events per day. Integrated with Stripe and SendGrid. Reduced billing errors by 90%. Tech stack: FastAPI, PostgreSQL, Celery, Stripe API.
HIPAA-compliant patient data API
Developed a FastAPI backend for a telemedicine platform. Handles PHI with encryption at rest and in transit. Passed HIPAA audit in 3 weeks. Tech stack: FastAPI, PostgreSQL, AWS KMS, Auth0.
Real-time order tracking API for ecommerce
Created a WebSocket-based order tracking API that updates 5,000+ clients in real time. Reduced support tickets by 40%. Tech stack: FastAPI, Redis, WebSockets, Docker.
KYC verification API for a fintech platform
Built a FastAPI service that processes identity verification requests with OCR and fraud checks. Handles 500 requests per minute. Tech stack: FastAPI, MongoDB, AWS Textract, Onfido.
Content moderation API for a social media app
Developed a FastAPI API that moderates 1 million posts per day using ML models. Reduced manual moderation by 80%. Tech stack: FastAPI, TensorFlow Serving, Redis, PostgreSQL.
Inventory sync API for a retail chain
Built a FastAPI integration layer that syncs inventory across 200 stores in real time. Cut stock discrepancies by 95%. Tech stack: FastAPI, PostgreSQL, RabbitMQ, Shopify API.
Why teams hire us.
Fixed price, not hourly
Every FastAPI project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. The price you see is the price you pay.
Senior engineers only
All IRPR engineers have 10+ years of Python experience. We don't outsource or use junior developers. Your API is built by engineers who have shipped FastAPI to production dozens of times.
Full code ownership
You own every line of code. No licensing fees, no vendor lock-in. We deliver the complete source code, Docker files, and CI/CD scripts in your private repository.
Production-ready from day one
Your API ships with monitoring, logging, error tracking, and documentation. We set up Sentry, Datadog, and OpenAPI docs. You don't need to add observability later.
Compliance built in
We build FastAPI APIs that meet HIPAA, PCI-DSS, and SOC 2 requirements. We implement encryption, audit logging, and access controls. Your API is audit-ready from launch.
Async by default
We use FastAPI's async capabilities from the start. Async SQLAlchemy sessions, async HTTP clients (httpx), and async background tasks. Your API handles thousands of concurrent requests without blocking.
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.