Leading FastAPI Development FirmDevelopment Firm
We build high-performance APIs in 12 weeks. Fixed price, senior engineers, zero surprises.
IRPR is a leading FastAPI development firm. We build production-grade APIs using FastAPI, Python 3.12, SQLAlchemy 2.0, Pydantic v2, and async PostgreSQL. Every project ships with automated testing, CI/CD pipelines, and OpenAPI documentation.
An MVP with IRPR takes 12 weeks and costs $80K-$250K. We handle everything from architecting async endpoints to deploying on AWS ECS or Kubernetes. Our FastAPI backends are built for HIPAA compliance, PCI-DSS Level 1, and SOC 2 Type II.
Founders hire IRPR to ship a SaaS MVP on FastAPI in 12 weeks. CTOs hire us to replace a slow Django monolith with a FastAPI microservice architecture. Product managers hire us to build a real-time data API using FastAPI and WebSockets. Enterprise architects hire us to migrate legacy REST APIs to FastAPI.
Types of software we ship.
SaaS Backend API
Build a multi-tenant FastAPI backend with Stripe subscription management and PostgreSQL row-level security. Ships with admin dashboard and API keys.
Real-Time Data API
WebSocket-based FastAPI server for live dashboards, chat, or financial tickers. Uses Redis pub/sub and asyncpg for sub-10ms latency.
Ecommerce Checkout API
FastAPI checkout service with Stripe Connect, inventory validation, and idempotency keys. Handles 10,000 requests per minute.
AI/ML Inference API
FastAPI endpoint hosting a fine-tuned LLM or computer vision model. Uses Celery for async task queuing and MLflow for model versioning.
Healthcare FHIR API
HIPAA-compliant FastAPI server serving FHIR R4 resources. Includes audit logging, SMART on FHIR authentication, and encrypted patient data.
Microservices Gateway
FastAPI API gateway routing to 20+ microservices with JWT validation, rate limiting, and circuit breakers. Built with httpx and OAuth2.
File Upload & Processing API
FastAPI endpoint for multipart file uploads with virus scanning, image resizing (Pillow), and S3 storage. Processes 500 files per minute.
Third-Party Integration API
FastAPI service that syncs data between Salesforce, HubSpot, and Shopify via webhooks and background tasks. Uses Celery Beat for scheduled syncs.
We build for every business type.
SaaS Companies
Healthcare Organizations
Fintech Startups
Ecommerce Brands
Media & Content Platforms
Why IRPR is the leading FastAPI development firm
We have shipped 200+ production FastAPI backends across 10 industries since 2020.
IRPR started building FastAPI apps in 2020, right after the framework hit 1.0. We chose FastAPI for its automatic OpenAPI docs, async-first design, and Pydantic validation. Today, 80% of our new projects use FastAPI as the primary backend framework.
Every FastAPI project at IRPR follows a fixed playbook: you get async endpoints, type-validated request models, automated migration scripts with Alembic, and a Grafana dashboard monitoring request latency and error rates. We deploy to AWS ECS Fargate with auto-scaling and zero-downtime rolling updates.
How IRPR compares to generic FastAPI development shops
Hiring a generalist agency for your FastAPI backend often leads to scope creep, slow performance, and security gaps.
Many development shops write FastAPI code but treat it like Flask with decorators. They skip async endpoint optimization, neglect connection pooling, and deploy without proper monitoring. That works for a demo but fails under production load.
IRPR is a leading FastAPI development firm because we specialize in the framework's strengths: async I/O, dependency injection, and automatic validation. Every endpoint is load-tested with Locust. Every database query is profiled for N+1 issues. Every deployment includes a canary release.
- Uses synchronous code and calls it FastAPI
- No automated API documentation
- Skips async database session management
- Deploys without CI/CD or health checks
- No load testing before production
- Hourly billing with no fixed budget
- Async endpoints with uvicorn and Gunicorn workers
- Auto-generated OpenAPI spec with Swagger UI
- Connection pooling with asyncpg and Redis cache
- GitHub Actions CI/CD with Sentry error tracking
- Locust load tests at 10,000 concurrent users
- Fixed price from $80K, roadmap delivered week 2
Our FastAPI development process in 4 phases
From a 90-minute call to a running API in 12 weeks. Here is exactly what happens.
Phase 1 is the discovery call. You talk to a senior FastAPI engineer (not a salesperson). We review your data models, third-party API integrations, and performance requirements. You get a written project estimate within 48 hours.
Phase 2 is the Roadmap. We produce a detailed technical specification: endpoint list, database schema, authentication flow, deployment architecture, and a fixed price. You approve the Roadmap before any code is written.
What ships with every FastAPI backend from IRPR
Every FastAPI project includes these deliverables. No optional extras. No hidden costs.
Our standard delivery includes a fully containerized FastAPI application on AWS ECS Fargate with Terraform infrastructure as code. The API is documented via OpenAPI 3.1 and Swagger UI. You get a Postman collection for manual testing.
Monitoring is built in from day one. We configure Sentry for error tracking, Grafana for metrics, and CloudWatch for log aggregation. You get alerts on p95 latency exceeding 500ms.
- Source code in your private GitHub repo
- FastAPI application with async endpoints and Pydantic v2 models
- Alembic migration scripts for PostgreSQL
- CI/CD pipeline on GitHub Actions with automated tests
- Dockerfile and docker-compose for local development
- Staging environment on AWS ECS Fargate
- Sentry error tracking and performance monitoring
- Grafana dashboard with request count, latency, and error rate
- OpenAPI 3.1 specification served at /docs
- Postman collection with sample requests
What we ship in this practice.
SaaS Subscription Analytics Platform
Built a FastAPI backend for a New York based analytics startup. Handles 50,000 concurrent users with 200ms p99 latency. Used FastAPI async endpoints, Redis caching, and Stripe subscription management. Reduced server costs by 40% compared to the previous Django setup.
Telemedicine Video API for Healthcare
Designed a HIPAA-compliant FastAPI service for a telemedicine client in Los Angeles. Integrated with Twilio Video and Epic EHR. Achieved 99.9% uptime during peak hours. Completed audit in 3 weeks with automatic encryption of all PHI.
Real-Time Payment Processing Engine
Built a PCI-DSS Level 1 compliant FastAPI payment gateway for a fintech company. Processes 10,000 transactions per minute using idempotency keys and async database writes. Integrated with Stripe Connect and Plaid for bank verification.
Multi-Vendor Ecommerce API
Developed a FastAPI backend for a San Francisco based marketplace. Handles 500 vendors and 50,000 products with real-time inventory sync. Uses Celery for order processing and Elasticsearch for product search. Reduced order processing time from 30 seconds to 2 seconds.
EdTech Student Performance API
Built a FERPA-compliant FastAPI backend for a Chicago based education platform. Serves 200,000 students with personalized learning recommendations. Uses Neo4j for recommendation graph and PostgreSQL for student records. Handles 1,200 requests per second during peak testing.
Real Estate MLS Data Aggregator
Created a FastAPI microservice that ingests MLS data from 50 regional sources. Processes 2 million property listings daily with deduplication and geocoding. Uses PostGIS for spatial queries and RabbitMQ for message queuing. Reduced data freshness from 24 hours to 15 minutes.
Why teams hire us.
Senior engineers only
Every FastAPI project at IRPR is built by engineers with 10+ years of Python experience. No juniors, no outsourcing. You work directly with a senior developer who has shipped 20+ FastAPI backends.
Fixed price from the Roadmap
You approve a fixed price in week 2, before any code is written. The price covers every endpoint, every integration, and every deployment. No hourly billing. No surprise invoices.
12-week delivery guarantee
We build your FastAPI MVP in 12 weeks or less. 98% of our projects ship on time. If we miss the deadline, you get a 10% discount on the next phase.
HIPAA and PCI-DSS compliance built in
We build HIPAA compliant FastAPI backends with BAA agreements and audit logging. Our PCI-DSS setups pass Level 1 SAQ validation. SOC 2 Type II reports available on request.
Full source code ownership
You own every line of code from day one. We put the source in your GitHub repo and transfer all cloud accounts on launch. No licensing fees. No lock-in.
Post-launch support included
Every project includes 30 days of post-launch support for bug fixes and minor tweaks. We also offer a monthly retainer for ongoing maintenance starting at $5,000 per month.
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.