Top FastAPI Development PartnerDevelopment Partner
We build production-grade FastAPI backends with async performance. Senior engineers ship your MVP in 8-12 weeks.
IRPR builds async-first FastAPI backends for production applications. We use Pydantic for data validation, SQLAlchemy for ORM, and Celery for background tasks to create high-performance APIs.
Typical projects ship in 8 to 12 weeks with a fixed price between $80,000 and $250,000. We deliver HIPAA, PCI-DSS, and SOC 2 compliant systems with full test coverage and CI/CD pipelines.
CTOs scaling microservices, startup founders needing an API-first platform, and enterprise teams migrating from legacy Python frameworks hire us. Each buyer gets a dedicated senior engineer who codes the entire backend.
Types of software we ship.
REST API Backend
Async REST API with FastAPI and Pydantic. Includes OpenAPI docs, rate limiting, and JWT auth out of the box.
Microservices Orchestration
Distributed microservices connected via RabbitMQ or Kafka. Each service runs in its own Docker container with health checks.
Real-Time Data Pipeline
Stream processing with FastAPI WebSockets and Redis Pub/Sub. Handles 10k+ events per second with low latency.
AI Model Serving API
GPU-accelerated inference endpoints using FastAPI with ONNX or TensorRT. Includes batching and request queuing via Celery.
SaaS Backend
Multi-tenant FastAPI backend with PostgreSQL schemas and Stripe subscription integration. Built for 99.9% uptime.
WebSocket Server
Persistent WebSocket connections for real-time dashboards and live notifications. Scales horizontally using Redis backplane.
API Gateway
Centralized gateway with rate limiting, authentication, and routing to multiple FastAPI services. Built with Traefik or nginx.
Data Ingestion Service
High-throughput ingestion from IoT devices or webhooks. Validates and stores data in TimescaleDB with automatic partitioning.
We build for every business type.
e-commerce, fintech, healthcare, SaaS, logistics, media
real estate, edtech, manufacturing, travel, IoT, adtech
analytics, AI startups, scientific computing, insurance, government, retail
CRM, ERP, payment gateways, cloud migration, devops, legacy modernization
on-demand, marketplace, social, gaming, blockchain, cybersecurity
Why Choose a Top FastAPI Development Partner
FastAPI delivers async performance out of the box, but building production-grade backends requires expertise beyond the documentation.
IRPR has shipped 200+ API projects using FastAPI, Python, and Postgres. We handle async concurrency, database connection pooling, and horizontal scaling so your API can handle 10,000 concurrent requests without breaking.
Every project includes automatic OpenAPI documentation, load testing at 5000 requests per second, and a CI/CD pipeline that deploys on every merge. We build for production from day one, not for prototypes.
Generic Python Shop vs IRPR
Not every agency has the async expertise to make FastAPI sing. Here is the difference.
Many agencies advertise FastAPI but deliver synchronous Flask-style code that wastes the framework's potential. They skip automated docs, load testing, and database optimization.
IRPR builds async-fast APIs from the first endpoint. We use connection pools, async database drivers, and Structured Logging (structlog) so your API is fast and debuggable in production.
- No async expertise
- Uses Flask for everything
- No automatic docs generation
- No load testing
- No CI/CD pipelines
- No post-launch monitoring
- Async-fast API design from day one
- FastAPI with Pydantic validation
- Auto-generated OpenAPI docs
- k6 load testing at 5000 RPS
- GitHub Actions CI/CD
- Sentry + Datadog monitoring
How We Build Your FastAPI Project
We follow a structured 4-phase process that de-risks your investment and delivers a production-ready backend.
Every FastAPI project starts with a 2-week Roadmap phase where we define the data model, API endpoints, and deployment architecture. You get a fixed price and timeline before any code is written.
The Development phase runs in 2-week sprints. We push code to your repo daily, deploy to staging weekly, and run automated tests on every pull request.
What Ships With Every FastAPI Backend
Our deliverables are complete, not just a code dump. You get everything needed to run and maintain the system.
We never hand over a half-baked repository. Every FastAPI project includes automated tests, documentation, and infrastructure-as-code so your team can deploy without us.
All code is written to production standards with linting (Ruff), type checking (mypy), and security scanning (Bandit) enforced in CI.
- Source code in your private GitHub repo
- OpenAPI / Swagger documentation
- Docker containers with docker-compose
- CI/CD pipeline using GitHub Actions
- Sentry error tracking
- Datadog dashboards for latency and errors
- Load test reports (k6 scenarios)
- Database migration scripts (Alembic)
- API test suite (pytest with HTTPX)
- 30 days of post-launch support
What we ship in this practice.
Real-time analytics dashboard API
Built an async FastAPI backend that ingests 50 million events per day and powers a live dashboard. Reduced query latency by 40% using TimescaleDB continuous aggregates. Tech stack: FastAPI, TimescaleDB, Redis, WebSockets.
HIPAA-compliant patient data API
Delivered a HIPAA-compliant FastAPI backend for a telehealth startup. All PHI encrypted at rest and in transit; passed security audit in 2 weeks. Tech stack: FastAPI, PostgreSQL, AWS HealthLake, Celery.
AI image moderation microservice
Built an inference API that classifies images in real-time using a PyTorch model served via FastAPI. Handles 10,000 images per minute with batching. Tech stack: FastAPI, PyTorch, ONNX, Redis.
SaaS subscription billing API
Created a multi-tenant FastAPI backend with Stripe subscription management and usage-based billing. Reduced churn by 15% through automated dunning emails. Tech stack: FastAPI, Stripe, PostgreSQL, Celery.
IoT device data ingestion service
Developed a high-throughput ingestion API that validates and stores 1 million IoT events per day. Data partitioned by time in TimescaleDB for fast queries. Tech stack: FastAPI, Kafka, TimescaleDB, Docker.
Payment gateway integration API
Built a unified FastAPI gateway that integrates Stripe, PayPal, and Square. Reduces transaction failures by 90% via automatic retries and idempotency keys. Tech stack: FastAPI, Redis, PostgreSQL, Docker.
Why teams hire us.
Fixed price, not hourly
Every FastAPI project gets a fixed quote after the 2-week Roadmap phase. No hourly billing, no surprise invoices, no scope creep charges. Our average project costs $80K-$250K.
Senior engineers only
We assign a single senior engineer with 10+ years of Python experience to your project. You never get a junior or a rotating team. The same person codes, deploys, and supports your API.
Production-ready from day one
We write automated tests, configure Sentry error tracking, and set up Datadog monitoring before the first deployment. Your API is production-ready at launch, not after months of fixes.
Post-launch support included
Every project includes 30 days of post-launch support for bug fixes and hotfixes. We monitor logs and respond within 4 hours during business days.
OpenAPI docs auto-generated
Every FastAPI endpoint comes with auto-generated OpenAPI documentation and a Swagger UI. Your frontend team can start integrating without waiting for manual docs.
Asynchronous by default
We use async SQLAlchemy sessions, async Redis clients, and async HTTP clients (httpx). Your API handles thousands of concurrent connections 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.