Premium FastAPI Development AgencyFastAPI Development
We build production-grade APIs and microservices with FastAPI. Ship your backend in 8-12 weeks with a fixed price.
IRPR is a premium FastAPI development agency. We build high-performance RESTful APIs, GraphQL endpoints, and microservices using FastAPI, Pydantic, SQLAlchemy, and async Python. Every project is designed for speed, type safety, and automatic OpenAPI documentation.
We ship production-ready backends in 8-12 weeks. Pricing ranges from $80K to $250K for a full API platform. All projects include load testing with Locust, CI/CD via GitHub Actions, and deployment on AWS ECS or Azure App Service. We follow HIPAA, PCI-DSS, and SOC 2 compliance where required.
Startups hire us to build their first API for a SaaS product. Mid-market companies hire us to migrate legacy Django or Flask apps to FastAPI. Enterprise teams hire us to build event-driven microservices for high-throughput systems. CTOs hire us when they need a senior-only team with no junior developers.
Types of software we ship.
RESTful API development
Build CRUD APIs with FastAPI, Pydantic validation, and automatic Swagger docs. Includes async database access with SQLAlchemy 2.0.
GraphQL API development
Implement GraphQL endpoints using Strawberry or Ariadne on top of FastAPI. Supports subscriptions, resolvers, and batched queries.
Microservices architecture
Design and deploy event-driven microservices with FastAPI, RabbitMQ, or Kafka. Each service runs in its own Docker container on Kubernetes.
Real-time API development
Add WebSocket support for real-time features like live chat, notifications, and data streaming using FastAPI's built-in WebSocket support.
Third-party API integration
Integrate FastAPI backends with Stripe, Twilio, SendGrid, Salesforce, and HubSpot. Handle webhooks and OAuth2 flows.
Data pipeline API
Build ETL APIs that ingest, transform, and serve data using FastAPI, Pandas, and Celery for background task processing.
Authentication and authorization
Implement JWT, OAuth2, and role-based access control (RBAC) in FastAPI. Supports SSO providers like Okta and Auth0.
API monitoring and observability
Add structured logging, metrics, and distributed tracing using OpenTelemetry, Prometheus, and Grafana. Includes Sentry error tracking.
We build for every business type.
SaaS platforms
Fintech and healthcare
Ecommerce and logistics
Media and publishing
Real estate and travel
Why choose a premium FastAPI development agency
FastAPI is 2x faster than Flask and 3x faster than Django REST Framework for async endpoints.
IRPR has shipped over 200 products using FastAPI since 2020. Our senior engineers have built APIs that handle 10,000 requests per second with sub-50ms latency. We use async SQLAlchemy, Redis caching, and connection pooling to maximize throughput. Every API is automatically documented with OpenAPI 3.1 and tested with pytest.
We do not hire junior developers. Every engineer on your project has at least 8 years of Python experience and has shipped multiple FastAPI projects in production. You get a dedicated team lead who writes code and reviews every pull request. Our average project timeline is 10 weeks from kickoff to deployment.
The difference between a generic dev shop and a premium FastAPI agency
Not all agencies build FastAPI backends the same way. Here is what sets IRPR apart.
Generic dev shops often assign junior developers to FastAPI projects. They skip async patterns, write synchronous endpoints, and ignore type hints. You get slow APIs with missing documentation and no load testing. Scope creep is common because the contract is hourly.
IRPR assigns senior engineers only. We write async endpoints with Pydantic models, add automatic OpenAPI docs, and run load tests with Locust before deployment. Every project has a fixed price from the Roadmap phase. No hourly billing. No scope creep.
- Junior developers building your API
- Synchronous endpoints with no async support
- No type hints or Pydantic models
- No OpenAPI documentation
- Hourly billing with scope creep
- No load testing before deployment
- Senior engineers with 8+ years Python experience
- Async endpoints with SQLAlchemy async sessions
- Full Pydantic validation and type safety
- Automatic OpenAPI 3.1 documentation
- Fixed price from Roadmap phase (week 2)
- Load testing with Locust and k6 before go-live
How IRPR builds your FastAPI backend in 4 phases
We follow a structured process from idea to deployment. Every phase has clear deliverables.
Phase 1 is the Idea phase. We map your API endpoints, data models, and integration points. You get a detailed specification with OpenAPI schema and ERD diagrams. This takes 1-2 weeks.
Phase 2 is the Roadmap. We create a fixed-price proposal with a timeline, milestone schedule, and risk assessment. You approve the plan before any code is written. This takes 1 week.
What ships with every FastAPI project from IRPR
Every project includes these deliverables by default. No hidden costs.
You own everything we build. Source code goes into your GitHub or GitLab repository from day one. We set up CI/CD with GitHub Actions, Sentry error tracking, and Datadog monitoring. All infrastructure is defined as code using Terraform or Pulumi.
Documentation is not an afterthought. We generate OpenAPI 3.1 specs for every endpoint. You also get a Postman collection, a deployment runbook, and a 30-minute walkthrough call with the engineering team.
- Source code in your GitHub or GitLab repo
- CI/CD pipeline with GitHub Actions
- Sentry error tracking and performance monitoring
- OpenAPI 3.1 specification for all endpoints
- Postman collection for manual testing
- Load test results from Locust or k6
- Deployment runbook with rollback steps
- Datadog or Grafana monitoring dashboards
- 30-minute walkthrough call with the team
- Full ownership of all code and IP
What we ship in this practice.
SaaS analytics API
Built a FastAPI backend for a real-time analytics platform. Handles 5,000 events per second using async SQLAlchemy and Redis streams. Reduced query latency from 2 seconds to 50ms. Tech stack: FastAPI, PostgreSQL, Redis, Docker.
Healthcare patient portal API
Developed HIPAA-compliant FastAPI APIs for a telemedicine startup. Supports appointment scheduling, video call initiation, and prescription management. Passed HIPAA audit with zero findings. Tech stack: FastAPI, PostgreSQL, Twilio, AWS ECS.
Fintech payment processing API
Built a PCI-DSS compliant payment orchestration API using FastAPI. Integrates with Stripe, Plaid, and Dwolla. Processes $2M in transactions monthly with 99.99% uptime. Tech stack: FastAPI, Stripe, PostgreSQL, Celery.
Ecommerce inventory management API
Created a real-time inventory API for a multi-warehouse retailer. Syncs stock levels across 12 warehouses using WebSocket push notifications. Reduced stockouts by 30%. Tech stack: FastAPI, PostgreSQL, Redis, Kafka.
Real estate MLS data API
Developed a FastAPI gateway that aggregates MLS listings from 8 different providers. Normalizes data into a single schema and serves it via GraphQL. Reduced data integration time from 3 weeks to 2 days. Tech stack: FastAPI, Strawberry, PostgreSQL, AWS Lambda.
Media content delivery API
Built a video streaming backend with FastAPI that serves 10,000 concurrent viewers. Uses chunked encoding and adaptive bitrate streaming. Achieved sub-1 second start time. Tech stack: FastAPI, S3, CloudFront, Redis.
Why teams hire us.
Senior engineers only
Every engineer on your project has 8+ years of Python experience and has shipped FastAPI in production. No junior developers. No offshore teams. You get a dedicated lead who writes code and reviews every PR.
Fixed price, not hourly
We give you a fixed price in the Roadmap phase (week 2). No hourly billing. No surprise invoices. If we find additional work, we tell you before we start and you approve the cost.
Ship in 8-12 weeks
Our average FastAPI project ships in 10 weeks. We use a sprint-based process with working endpoints every 2 weeks. You see progress continuously, not just at the end.
Production-ready from day one
We deploy to AWS or Azure with CI/CD, monitoring, and load testing. Every API is automatically documented with OpenAPI 3.1. You get a Postman collection and a deployment runbook.
Full code ownership
You own all source code, documentation, and infrastructure as code. There is no license fee, no recurring payment, no vendor lock-in. We transfer everything to your repo on day one.
Compliance built in
We build APIs that meet HIPAA, PCI-DSS, and SOC 2 requirements. Our engineers have shipped compliant systems for healthcare, fintech, and enterprise clients. We include encryption, audit logging, and access controls by default.
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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