Top FastAPI Development ConsultantsFastAPI Consultants
We build FastAPI backends that ship in 8-12 weeks. Fixed pricing, senior engineers, no overhead.
IRPR builds FastAPI backends for data-intensive applications. We use PostgreSQL, Redis, and Docker for containerized deployments. Async endpoints handle 10,000+ concurrent requests with full OpenAPI documentation.
Projects ship in 12-14 weeks for full-stack MVPs. Pricing starts at $80K and goes to $250K for complex systems with multiple integrations. Every project includes load testing, security audit, and CI/CD pipelines.
Buyer personas include startup CTOs needing a scalable API, enterprise platform teams migrating from monolithic APIs, fintech founders requiring PCI-DSS compliance, and SaaS companies adding API-first features.
Types of software we ship.
REST API backend
Replaces legacy REST APIs with FastAPI. Async handlers reduce latency by 40% compared to Flask.
Async microservice
Independent microservice with background workers. Uses Celery and Redis for task queues.
Real-time data pipeline
Streams data via WebSockets and Server-Sent Events. Handles 50M events/day with Kafka.
GraphQL gateway
GraphQL layer over FastAPI using Strawberry. Unifies multiple data sources into one endpoint.
OAuth2 authentication service
Stateless OAuth2 server with JWT tokens. Supports OIDC and social logins via Auth0 integration.
WebSocket server
Real-time WebSocket server for chat and live updates. Maintains 100K concurrent connections.
Background task scheduler
Cron-like job scheduler using APScheduler. Manages 500+ scheduled tasks with retry logic.
Machine learning inference API
Serves ML models with FastAPI endpoints. Uses PyTorch and ONNX Runtime for sub-50ms inference.
We build for every business type.
SaaS
Fintech
Healthcare
Ecommerce
Data Analytics
What sets top FastAPI development consultants apart
IRPR combines deep Python expertise with a proven delivery process that eliminates risk.
FastAPI projects at IRPR start with a two-week Roadmap phase where we define every endpoint, error code, and performance requirement. You get a fixed quote before any code is written. No surprises.
Our senior engineers have built over 200 products using FastAPI, Pydantic, and async SQLAlchemy. We optimize for 99.9% uptime and sub-200ms response times even under load.
Generic consultants vs. IRPR: the real difference
Most agencies pile on hours and deliver late. IRPR builds fixed-price FastAPI backends on schedule.
We have seen too many FastAPI projects fail because of vague requirements, junior developers, and endless billing loops. Generic dev shops often skip testing and monitoring.
IRPR ships every project with automated tests, CI/CD pipelines, and monitoring dashboards. You own the code from day one and can deploy independently after launch.
- hourly billing with no cap
- junior developers learning FastAPI on your project
- no performance testing until production
- unclear API documentation
- no DevOps handover
- code owned by the agency
- fixed price from day one
- senior engineers with 10+ years Python experience
- load testing from week 3
- auto-generated OpenAPI docs
- full CI/CD playbook provided
- source code in your GitHub from sprint 1
How IRPR builds your FastAPI backend in 8-12 weeks
Our four-phase process turns your idea into a production-ready API with no wasted cycles.
Phase 1: Roadmap. We define every API endpoint, data model, and integration point. You get an exact price and timeline. 2 weeks.
Phases 2-4: Build, test, deploy. We ship working software in 2-week sprints. After each sprint you see a live staging environment.
What ships with every FastAPI project
Every IRPR FastAPI backend comes with these deliverables included in the fixed price.
You get everything needed to operate the API without depending on IRPR. We document every deployment step.
All tools are industry-standard and transferable to your own team.
- Source code in your private GitHub repository
- CI/CD pipeline with GitHub Actions and Docker Hub
- Auto-generated OpenAPI 3.0 documentation
- Database migrations with Alembic
- Load test script using Locust (1000+ concurrent users)
- Sentry error tracking and performance monitoring
- Grafana dashboards for API metrics (latency, error rates, throughput)
- Deployment playbook for AWS ECS or GCP Cloud Run
- Postman collection for all endpoints
What we ship in this practice.
Subscription billing API
Built a FastAPI billing engine for a SaaS startup that reduced invoice errors by 95%. Handles 10,000 subscriptions with Stripe integration, proration, and dunning emails. Tech stack: FastAPI, Stripe API, Celery, PostgreSQL.
Real-time fraud detection service
Developed an async FastAPI service that screens transactions in under 30ms. Uses ML models deployed via ONNX Runtime. Reduced false positive alerts by 60%. Tech stack: FastAPI, PyTorch, Redis, Kafka.
HIPAA-compliant patient intake API
Delivered a FHIR-compliant FastAPI backend for a telehealth platform. Handles 5,000 patient records per day with end-to-end encryption and audit logging. Tech stack: FastAPI, FHIR, PostgreSQL, AWS KMS.
Ecommerce product catalog API
Created a FastAPI catalog service that serves 2 million product variants with faceted search. Response times average 45ms under load. Tech stack: FastAPI, Elasticsearch, Redis, Docker.
Multi-tenant analytics dashboard API
Built a FastAPI backend that aggregates data from 20+ sources into real-time dashboards. Each tenant sees only their own data via row-level security. Tech stack: FastAPI, ClickHouse, WebSockets, Kubernetes.
API gateway for microservices
Replaced a monolith with a FastAPI gateway that routes requests to 12 microservices. Added OAuth2 authentication and rate limiting. Reduced overall latency by 35%. Tech stack: FastAPI, Redis, Traefik, Auth0.
Why teams hire us.
Fixed price, not hourly
Every FastAPI project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
All IRPR engineers have 10+ years building Python backends. They have shipped FastAPI to production for 200+ clients across 50 countries.
Async-first architecture
We design every endpoint with async/await and Pydantic validation. Our FastAPI backends handle 10,000 concurrent connections without blocking.
Security and compliance built in
We implement OAuth2, JWT, and HTTPS by default. For regulated projects we enforce HIPAA or PCI-DSS controls and provide audit logs.
Open source tools, no lock-in
We use standard open source libraries: SQLAlchemy, Alembic, Celery, Docker. Your team can maintain the code without paying IRPR a retainer.
Post-launch support included
Every project includes 30 days of production support. We monitor uptime and respond to incidents within 4 hours during business days.
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.