FastAPI Development FirmDevelopment Firm
We build async APIs with FastAPI. Senior Python engineers ship your backend in 12 weeks.
IRPR is a FastAPI development firm that builds high-performance async APIs. Our senior engineers use FastAPI with Pydantic v2, SQLAlchemy 2.0, and async PostgreSQL to deliver endpoints that handle 10,000+ requests per second.
Every FastAPI project ships with a fixed price, a clear roadmap, and a timeline of 12-14 weeks. Pricing ranges from $80K to $250K depending on complexity. We build to meet PCI-DSS, HIPAA, and SOC 2 compliance standards.
Startups needing a scalable MVP hire us because we deliver production-ready code in 12 weeks. Enterprise teams hire us to migrate legacy REST APIs to async FastAPI. SaaS companies hire us to build real-time microservices with WebSocket support.
Types of software we ship.
REST API Backend
Async endpoints with FastAPI, Pydantic validation, and PostgreSQL. Auto-generated OpenAPI docs.
Microservices Platform
Distributed services using FastAPI, RabbitMQ, and Docker Compose. Each service deploys independently.
Real-time WebSocket API
WebSocket endpoints in FastAPI for live notifications, chat, and streaming data with Redis pub/sub.
GraphQL Gateway
GraphQL layer built with Strawberry on top of FastAPI, aggregating data from multiple backends.
Payment Integration API
Stripe and Braintree integration with FastAPI. Handles webhooks, idempotency, and PCI-DSS compliance.
Data Processing Pipeline
Async data ingestion and transformation using FastAPI, Celery, and S3. Processes 1M+ records per run.
Authentication Service
OAuth2, JWT, and social login microservice with FastAPI. Supports Okta, Auth0, and custom providers.
Admin Dashboard API
FastAPI backend for admin panels with role-based access control, audit logs, and export to CSV/Excel.
We build for every business type.
SaaS platforms
Fintech startups
Healthcare applications
Ecommerce backends
Logistics and supply chain
FastAPI Development Services by a Firm That Ships
We deliver production FastAPI backends with async performance and clear documentation.
FastAPI is built on Python 3.10+ async features, using Starlette under the hood for high concurrency. Our team customizes endpoints with Pydantic v2 models, SQLAlchemy 2.0 async sessions, and Alembic migrations. Every API includes auto-generated OpenAPI (Swagger) docs and automatic request validation.
We integrate FastAPI with Redis for caching, Celery for background tasks, and Docker for containerization. Our CI/CD pipelines run tests with pytest-asyncio and deploy via GitHub Actions. Clients get 99.9% uptime SLAs and full monitoring with Sentry and Datadog.
How a FastAPI Development Firm Differs from a General Dev Shop
Not every team understands async Python. We specialize in FastAPI from the first commit.
General agencies often write synchronous Flask or Django code and bolt on async later. That leads to slow endpoints and race conditions. At IRPR, every FastAPI project starts with async from day one. We design async routes, async database sessions, and async background tasks.
We also enforce strict type hints with Pydantic and MyPy catching 90% of errors before runtime. Our code reviews check for proper dependency injection, lifespan management, and connection pooling. This means your API scales under load without crashing.
- Uses Flask or Django sync views, converts later
- No type validation, runtime errors common
- Manual migration scripts, no Alembic
- Monolithic deployment, no Docker Compose
- No async testing, flaky CI
- Hourly billing, scope creep
- Async FastAPI with SQLAlchemy 2.0, built async
- Pydantic v2 models, validated at the edge
- Alembic migrations, versioned and tested
- Docker Compose with multi-stage builds
- pytest-asyncio, 90%+ code coverage
- Fixed price, roadmap phase, no surprise invoices
Our Process for FastAPI Development Projects
From idea to production API in 12 weeks with clear milestones.
We break every FastAPI project into four phases: discovery, design, build, and release. In the discovery call we audit your existing stack and define your endpoints. Then we produce a detailed roadmap with wireframes for each API resource.
During build we develop in two-week sprints, deploying to a staging environment after each sprint. You see working endpoints every 14 days. We run load tests with Locust to confirm 10,000+ req/s before release.
What Ships with Every FastAPI Project
Everything you need to run and maintain your API in production.
We don't hand over a ZIP file and vanish. Every FastAPI project includes the full development pipeline, monitoring, and documentation. You and your team can maintain and extend the API immediately.
- Source code in your private GitHub repo
- CI/CD pipeline with GitHub Actions
- Docker Compose files for local development
- Alembic migration scripts for all schema changes
- pytest-asyncio test suite with 90%+ coverage
- OpenAPI (Swagger) documentation auto-generated
- Sentry error tracking configured
- Datadog or Prometheus monitoring dashboards
- Deployment scripts for AWS ECS or GCP Cloud Run
- Postman collection for manual testing
What we ship in this practice.
SaaS Subscription Backend
Built a multi-tenant FastAPI backend for a B2B SaaS startup. Handles 50,000 daily API calls, Stripe subscription management with webhooks, and role-based access. Reduced infrastructure costs by 40% compared to previous REST setup. Stack: FastAPI, SQLAlchemy, Redis, Docker.
Fintech Payment Gateway
Developed a PCI-DSS compliant payment processing API with FastAPI. Processed $2M in transactions per month with 99.99% uptime. Integrated with Plaid for bank verification and Stripe for card processing. Stack: FastAPI, Pydantic, Celery, PostgreSQL.
Healthcare Patient Portal
HIPAA-compliant FastAPI backend for a telemedicine platform. Manages 10,000 patient records, real-time video scheduling, and encrypted storage. Achieved sub-200ms response times under load. Stack: FastAPI, SQLAlchemy, Redis, AWS S3.
Ecommerce Inventory Microservice
Async FastAPI microservice for real-time inventory sync across 5 warehouses. Handles 1,000+ updates per second with no data loss. Integrated with Shopify and Magento via webhooks. Stack: FastAPI, RabbitMQ, Redis, PostgreSQL.
Real Estate MLS API
FastAPI backend consolidating MLS data from 3 separate providers into a single REST/GraphQL API. Reduced data refresh time from 4 hours to 12 minutes. Serves 500+ real estate agents daily. Stack: FastAPI, Strawberry GraphQL, PostgreSQL, Elasticsearch.
Logistics Tracking Platform
Built real-time shipment tracking API using FastAPI WebSockets. Handles 200,000 location pings per hour for a logistics SaaS. Reduced latency from 2 seconds to under 50ms. Stack: FastAPI, WebSockets, Redis Pub/Sub, MongoDB.
Why teams hire us.
Senior Python engineers only
Every engineer on your FastAPI project has 8+ years of Python experience and has shipped at least 5 production APIs. No junior developers, no code monkeys.
Fixed price from day one
You get a fixed quote after the Roadmap phase (week 2). No hourly billing, no scope creep charges. Price is locked for the entire 12-14 week build.
Async by default, not retrofit
We write async FastAPI from the first commit. No synchronous wrappers or blocking calls. Your API scales to 10,000+ req/s out of the box.
Full CI/CD and monitoring included
Every project ships with GitHub Actions, Docker Compose, Sentry, and Datadog. You can deploy with one click or automate via your own pipeline.
HIPAA, PCI-DSS, SOC 2 ready
We build compliance into every FastAPI project from the start. Encryption at rest, audit logs, role-based access, and data isolation are standard.
You own every line of code
After the final payment, the entire codebase is yours. No licensing, no royalties, no lock-in. You can extend, sell, or repurpose the API however you want.
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.