Expert FastAPI Development ConsultantsDevelopment Consultants
We build production-grade FastAPI backends in 8-12 weeks. Fixed price, senior engineers, zero fluff.
IRPR builds high-performance APIs with FastAPI, Python 3.12, SQLAlchemy 2.0, and Pydantic v2. We use async endpoints, dependency injection, and automatic OpenAPI docs to ship APIs that handle 10,000+ requests per second on a single instance.
Every project ships in 8-12 weeks with a fixed price ranging from $80K to $250K depending on scope. We handle compliance for HIPAA, PCI-DSS, and SOC 2 out of the box. Source code is yours from day one.
We work with CTOs who need a scalable backend fast, product owners launching MVPs with Python, and engineering leads migrating from Flask or Django to async FastAPI for better throughput.
Types of software we ship.
REST API Development
Build stateless REST APIs with FastAPI, Pydantic schemas, and SQLAlchemy async sessions for CRUD operations.
GraphQL API Development
Implement GraphQL endpoints with Strawberry or Ariadne on top of FastAPI for flexible data queries.
Microservices Architecture
Design and deploy FastAPI microservices with RabbitMQ, Redis, and Docker Compose for event-driven systems.
Async Data Pipelines
Build real-time data ingestion pipelines using FastAPI background tasks, Celery, and WebSockets.
API Gateway Development
Create API gateways with FastAPI, rate limiting via SlowApi, and JWT authentication for multi-service backends.
WebSocket Server Development
Build real-time WebSocket servers with FastAPI for chat apps, live dashboards, and streaming data.
Third-Party API Integration
Integrate Stripe, Twilio, OpenAI, or Salesforce APIs using FastAPI with async HTTPX clients and retry logic.
API Migration & Refactoring
Migrate monolithic Flask or Django REST APIs to FastAPI with async support, improved performance, and auto-generated docs.
We build for every business type.
Fintech
Healthcare
SaaS
Ecommerce
Logistics & Media
Why Hire Expert FastAPI Development Consultants
IRPR has shipped 200+ production APIs using FastAPI since version 0.45.
FastAPI is the fastest growing Python web framework on GitHub with over 75,000 stars. It uses asynchronous programming to handle thousands of concurrent connections without blocking. IRPR's senior engineers have built APIs for fintech platforms processing $50M+ monthly and healthcare systems serving 500,000+ patients.
We write every endpoint with Pydantic v2 for automatic request validation, SQLAlchemy 2.0 for async database access, and Alembic for zero-downtime migrations. Every API ships with OpenAPI docs, Sentry error tracking, and Prometheus metrics from day one.
Generic Dev Shop vs Expert FastAPI Development Consultants
Not all agencies understand async Python. Here is what sets IRPR apart.
Many dev shops write FastAPI like Flask, using synchronous code that blocks the event loop. This kills performance and defeats the purpose of using FastAPI. IRPR builds every endpoint with proper async/await patterns, connection pooling, and database session management.
We also ship production-ready observability, CI/CD pipelines, and compliance documentation. Your team gets a complete backend, not just code that works on a laptop.
- Sync endpoints that block the event loop
- No automated API docs
- Manual deployment with SSH
- No error tracking
- Vague hourly billing
- No compliance knowledge
- Async endpoints with proper await
- Auto-generated OpenAPI docs
- CI/CD on GitHub Actions with Docker
- Sentry and Prometheus built in
- Fixed price from the Roadmap phase
- HIPAA, PCI-DSS, SOC 2 ready
Our FastAPI Development Process
We move from idea to production API in 4 phases over 8-12 weeks.
Every project starts with a 2-week Roadmap phase where we define endpoints, data models, and integration points. You get a fixed price quote and a detailed technical specification before any code is written.
After approval, we build in 2-week sprints with daily standups, weekly demos, and continuous deployment to a staging environment. You see working endpoints every Friday.
What Ships With Every FastAPI Project
You get more than code. Every project includes the full production stack.
IRPR treats every API as a production system from day one. We do not build prototypes and then figure out deployment later. Every endpoint is designed to run under load, handle errors gracefully, and scale horizontally.
Your team receives a complete package: source code, infrastructure as code, monitoring dashboards, and a runbook for on-call engineers.
- Source code in your GitHub repo with full commit history
- CI/CD pipeline on GitHub Actions with automated tests and Docker builds
- Sentry error tracking with alerting on Slack or PagerDuty
- Prometheus metrics and Grafana dashboards for request latency and error rates
- OpenAPI 3.1 documentation hosted on Swagger UI and Redoc
- Database migration scripts using Alembic with rollback support
- Load test scripts using Locust with 10,000 concurrent user simulation
- Deployment playbook for AWS ECS, Google Cloud Run, or Kubernetes
- Postman collection with all endpoints and example payloads
- Security audit report covering SQL injection, XSS, and rate limiting
What we ship in this practice.
Payment Processing API for Fintech Startup
Built a FastAPI backend that processes 50,000 transactions per day with Stripe integration, idempotency keys, and idempotent retries. Reduced payment failure rate by 40% and cut API response time from 800ms to 120ms. Stack: FastAPI, PostgreSQL, Stripe, Redis, Docker.
HIPAA-Compliant Patient Data API
Developed a FastAPI service for a telehealth platform handling PHI for 200,000+ patients. Implemented BAA-compliant logging, encrypted payloads, and audit trails. Passed HIPAA audit on first submission. Stack: FastAPI, PostgreSQL with pgcrypto, AWS KMS, Sentry.
Real-Time Analytics API for SaaS Platform
Created a WebSocket-based API using FastAPI that streams live user analytics to 5,000 concurrent dashboard clients. Replaced a polling-based system, reducing database load by 80%. Stack: FastAPI, Redis Pub/Sub, WebSockets, ClickHouse.
Inventory Sync API for Ecommerce Brand
Built a FastAPI service that syncs inventory across Shopify, Amazon, and 3PL warehouses in real-time. Handles 10,000 SKU updates per minute with conflict resolution. Reduced overselling incidents by 95%. Stack: FastAPI, MySQL, RabbitMQ, Shopify API.
Route Optimization API for Logistics Company
Developed a FastAPI microservice that computes optimal delivery routes for 500+ drivers using Google OR-Tools and async HTTPX. Cut average delivery time by 18 minutes per route. Stack: FastAPI, PostgreSQL, Google Maps API, Redis, Celery.
Content Delivery API for Media Platform
Built a FastAPI backend that serves 1 million video metadata requests per day with CDN integration and adaptive bitrate streaming. Reduced origin server load by 70% using Redis caching. Stack: FastAPI, MongoDB, CloudFront, Redis, FFmpeg.
Why teams hire us.
Senior engineers only, no juniors
Every IRPR engineer has 8+ years of Python experience and has shipped at least 5 production FastAPI projects. We do not outsource to junior developers or offshore teams. You work directly with the person writing your code.
Fixed price from week 2
After the Roadmap phase (week 2), you get a fixed price quote for the entire project. No hourly billing, no time tracking, no surprise invoices. If we find additional work, we quote it separately before starting.
Async-first architecture
We do not write synchronous code in FastAPI. Every endpoint, database query, and external API call uses async/await with proper connection pooling. Your API handles 10,000+ requests per second without blocking.
Compliance built in, not bolted on
IRPR has built APIs for HIPAA, PCI-DSS, and SOC 2 environments. We implement encryption at rest and in transit, audit logging, and role-based access control from the start. No retrofitting compliance after the fact.
Full ownership, no lock-in
You own all source code, Docker images, CI/CD pipelines, and documentation. We do not use proprietary frameworks or require ongoing licensing. Your team can take over maintenance on day one.
Start in 1-2 weeks
We can begin your Roadmap phase within 2 weeks of signing. Our team is US-based with overlap hours for real-time collaboration. No waiting months for availability.
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.