Leading FastAPI Development AgencyFastAPI Development
Build production-grade APIs with Python 3.12 and Pydantic v2. Ship in 8-12 weeks with a fixed price.
IRPR is a leading FastAPI development agency. We build high-performance APIs using Python 3.12, Pydantic v2, and async SQLAlchemy. Our team writes async endpoints that handle 10,000+ requests per second with automatic OpenAPI documentation.
We ship your FastAPI backend in 8-12 weeks. Our fixed price ranges from $80K to $250K depending on scope. Every project includes JWT authentication, rate limiting, Redis caching, and full test coverage with pytest. We comply with HIPAA, PCI-DSS, SOC 2, and FERPA standards.
CTOs hire us to replace slow Django monoliths with async FastAPI services. Startup founders hire us to build their SaaS MVP with Stripe integration and PostgreSQL. Enterprise architects hire us to create microservice gateways that reduce latency by 40%.
Types of software we ship.
REST API Development
Build stateless RESTful APIs with FastAPI, Pydantic schemas, and async endpoints. Integrate with PostgreSQL and Redis for sub-10ms response times.
GraphQL API Development
Create GraphQL APIs using Strawberry or Ariadne on top of FastAPI. Support real-time subscriptions and efficient data fetching.
Microservice Architecture
Design event-driven microservices with FastAPI, RabbitMQ, and Docker. Deploy on AWS ECS with auto-scaling and health checks.
Real-Time WebSocket API
Build WebSocket-based APIs for live chat, notifications, and data streaming. Use FastAPI's WebSocket support with Redis pub/sub.
Data Processing Pipeline
Develop async data pipelines with FastAPI, Celery, and Apache Kafka. Process millions of records per hour for analytics and ETL.
Machine Learning API
Deploy ML models as FastAPI endpoints with ONNX Runtime or TensorFlow Serving. Achieve inference times under 50ms.
Third-Party Integration API
Create unified APIs that connect to Stripe, Salesforce, HubSpot, and Slack. Handle webhooks and OAuth2 flows automatically.
Admin Dashboard Backend
Build FastAPI backends for admin dashboards with SQLAlchemy ORM, Alembic migrations, and role-based access control (RBAC).
We build for every business type.
SaaS companies
Healthcare
Fintech
Ecommerce
Enterprise
Why IRPR is a Leading FastAPI Development Agency
We have shipped over 200 FastAPI projects since 2019.
Our engineers wrote their first FastAPI endpoints in 2019 when version 0.30 was released. Since then we have built APIs for healthcare, fintech, and SaaS companies across 50 countries. Every API is tested with pytest, covered by CI/CD, and deployed on AWS ECS with auto-scaling.
We use Python 3.12, Pydantic v2, and async SQLAlchemy 2.0 as our standard stack. Our APIs handle 10,000 requests per second with 99.9% uptime. We ship complete OpenAPI documentation and Postman collections with every project.
How IRPR Differs from Generic Dev Shops
Most agencies reuse the same Django template and call it custom.
Generic dev shops write synchronous Django views and call it a day. They do not use async endpoints, Pydantic validation, or proper dependency injection. Their APIs fail under load and require constant rewrites.
IRPR builds every FastAPI project from scratch with async endpoints, typed schemas, and automated testing. We use Pydantic v2 for request validation and async SQLAlchemy for database access. Our APIs scale without rewrites.
- Uses synchronous Django with no async support
- No Pydantic validation, uses manual parsing
- No automated API documentation
- No rate limiting or caching
- No CI/CD pipeline for the API
- No load testing before deployment
- Builds async FastAPI endpoints with Python 3.12
- Uses Pydantic v2 for strict request validation
- Generates OpenAPI docs and Postman collections
- Implements Redis caching and rate limiting
- Sets up GitHub Actions CI/CD with pytest
- Runs load tests with locust before deployment
Our FastAPI Development Process
We move from idea to production API in 8-12 weeks.
Every project starts with a 2-week Roadmap phase where we define endpoints, data models, and integrations. We deliver a detailed API specification and a fixed price quote. No surprises.
Then we build your API in 6-10 weekly sprints. You see working endpoints every week. We deploy to staging on week 3 and production by week 8. Full test coverage and documentation ship with the code.
What Ships with Every FastAPI Project
You get more than just code. You get a production-ready system.
Every FastAPI project includes source code in your GitHub repo, CI/CD pipeline, automated tests, and deployment scripts. We do not hand over a zip file and disappear.
We also provide monitoring dashboards, error tracking, and performance benchmarks. Your team can take over immediately or we can continue with maintenance.
- Source code in your private GitHub repo
- CI/CD pipeline with GitHub Actions and pytest
- Deployment scripts for AWS ECS or Docker Compose
- OpenAPI documentation (Swagger UI + ReDoc)
- Postman collection with all endpoints
- Sentry error tracking and Grafana dashboards
- Load test results with locust
- Rate limiting and Redis caching configured
- JWT authentication with refresh tokens
- Database migrations with Alembic
What we ship in this practice.
SaaS Subscription API
Built a FastAPI backend for a subscription analytics platform. Handles 5,000 requests/second with Stripe webhook integration. Reduced failed payments by 30% using async retry logic. Stack: FastAPI, PostgreSQL, Redis, Stripe.
HIPAA-Compliant Patient API
Developed a FastAPI API for a telemedicine startup. Handles PHI data with end-to-end encryption and audit logging. Passed HIPAA audit in week 6. Stack: FastAPI, PostgreSQL, AWS KMS, Twilio.
Fintech Payment Gateway API
Created a PCI-DSS compliant payment API for a card processing company. Processes 10,000 transactions per minute with tokenization. Reduced chargeback rate by 25%. Stack: FastAPI, PostgreSQL, Redis, Stripe Connect.
Ecommerce Product Catalog API
Built a FastAPI catalog API for a multi-vendor marketplace. Supports 1 million products with full-text search and image uploads. Cut page load time from 3 seconds to 200ms. Stack: FastAPI, PostgreSQL, Elasticsearch, S3.
Real-Time Chat API
Developed a WebSocket-based chat API for a customer support platform. Handles 50,000 concurrent connections with Redis pub/sub. Reduced message delivery latency to under 50ms. Stack: FastAPI, Redis, WebSockets, MongoDB.
ML Model Inference API
Built a FastAPI endpoint for a computer vision startup. Deploys PyTorch models with ONNX Runtime for sub-30ms inference. Handles 1,000 requests/second on a single GPU. Stack: FastAPI, ONNX Runtime, PyTorch, AWS SageMaker.
Why teams hire us.
Senior FastAPI engineers only
Every engineer on your project has 5+ years of Python experience and has shipped at least 10 FastAPI projects. We do not outsource or use juniors.
Fixed price, not hourly
You get a fixed quote after the 2-week Roadmap phase. No hourly billing, no surprise invoices, no scope creep charges.
8-12 week MVP delivery
We ship production-ready APIs in 8-12 weeks. Our average MVP timeline is 10 weeks across 200+ projects.
Full code ownership
You own every line of code. We transfer the entire GitHub repo, CI/CD pipeline, and deployment scripts at the end of the project.
Compliance-ready from day one
We build HIPAA, PCI-DSS, SOC 2, and FERPA compliant APIs. Our standard stack includes encryption, audit logging, and access controls.
Post-launch support included
We provide 30 days of post-launch support for bug fixes and minor changes. Extended maintenance is available at $5K/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.