Best FastAPI Development ServicesDevelopment Services
We build production-grade FastAPI backends in 12 weeks. Fixed price, senior engineers, full ownership of code.
IRPR delivers the best FastAPI development services for startups and enterprises. We use Python 3.12, Pydantic v2 for data validation, SQLAlchemy 2.0 for ORM, and Redis for caching. Every API is built with async endpoints, automatic OpenAPI documentation, and production error tracking via Sentry.
A new FastAPI backend ships in 12 weeks for most projects. Pricing starts at $80K and goes to $250K for complex systems with 50+ endpoints, Stripe integration, and multi-region deployments. We handle PCI-DSS for fintech and HIPAA for healthcare compliance from day one.
Startups hire us to replace slow Django monoliths with async FastAPI microservices. Series A companies need PCI-compliant payment APIs. Healthcare platforms require HIPAA-compliant FHIR backends. SaaS companies want multitenant APIs with rate limiting and usage-based billing.
Types of software we ship.
FastAPI REST API
Public REST endpoints with JWT auth, rate limiting, and Redis caching. Ships with Postman collection. Uses SQLAlchemy 2.0 for PostgreSQL.
FastAPI GraphQL API
GraphQL gateway using Strawberry or Ariadne. Single endpoint for complex queries. Batches database calls automatically with DataLoader.
FastAPI Microservices
Decoupled async services communicating via RabbitMQ or Kafka. Each service is a separate FastAPI app with its own database and cache.
FastAPI WebSocket Server
Real-time WebSocket connections for chat, live data feeds, and collaborative editing. Uses Redis Pub/Sub for horizontal scaling.
FastAPI Admin Panel
Custom admin dashboard with role-based access, audit logs, and inline editing. Built with FastAPI + React and served via CDN.
FastAPI Third-Party Integrations
Integration middleware connecting Stripe, Salesforce, HubSpot, or ClearCheck. Uses Celery for async webhook processing.
FastAPI File Upload Service
Secure file upload endpoints with S3 presigned URLs. Handles multipart forms, chunked uploads, and virus scanning via ClamAV.
FastAPI ETL Pipeline
Data extraction, transformation, and loading APIs using Pandas and Databricks. Scheduled via Celery Beat with Sentry monitoring.
We build for every business type.
SaaS Platforms
Fintech Apps
Healthcare Platforms
Ecommerce Applications
Real Estate Systems
Why IRPR delivers the best FastAPI development services
We have shipped 200+ production apps. Our FastAPI backends scale to millions of requests per day.
Every FastAPI project starts with a 2-week Roadmap phase where we define endpoints, data models, and integrations. You get a fixed price and a delivery date before any code is written. Our developers work in your GitHub repo from day one.
We enforce strict async patterns from the start. Routes are non-blocking, database queries use async SQLAlchemy sessions, and third-party calls use httpx. This keeps response times under 50ms at 99th percentile even under load.
The difference between IRPR and a generic dev shop
Not all FastAPI development services are the same. Here is what sets us apart.
Most agencies start coding from a vague proposal and bill hourly until the budget runs out. We do the opposite. The Roadmap phase locks scope, price, and timeline before a single endpoint is built.
Our senior engineers know FastAPI internals: they optimize Pydantic serialization, use dependency injection for auth flows, and cache aggressively with Redis. We never hand off work to juniors.
- Starts coding without a detailed specification
- Bills by the hour with no cap
- Assigns junior developers to your project
- Ignores async patterns, blocking the event loop
- No CI/CD pipeline; deploys manually
- Provides no documentation for your API
- Delivers a complete Roadmap with endpoints and data model before coding
- Quotes a fixed price in the Roadmap phase (week 2)
- Assigns only senior engineers with 8+ years experience
- Enforces async/await everywhere for sub-50ms responses
- Sets up GitHub Actions CI/CD with automatic deployment to AWS ECS
- Ships auto-generated OpenAPI docs and a Postman collection
Our process for building your FastAPI backend
We follow four phases to deliver production-ready APIs on time and on budget.
Every project is different, but the structure is the same. The Roadmap phase costs $5K and is refundable if you decide not to proceed. After that, the price is fixed and the timeline is guaranteed.
We use GitHub Issues for task tracking, Slack for daily updates, and weekly video calls for demos. You see progress in real time.
What ships with every FastAPI project
We deliver a complete production system, not just code.
You own everything. Source code, database migrations, CI/CD pipelines, monitoring dashboards. Nothing is locked behind a subscription or a license.
We include a 30-day support window after launch. During that time, we monitor errors, fix any issues, and help your team onboard.
- Source code in your private GitHub repo with full commit history
- Auto-generated OpenAPI (Swagger) documentation at /docs
- CI/CD pipeline via GitHub Actions deploying to AWS ECS
- Dockerfiles and docker-compose for local development
- Pytest test suite with 90%+ code coverage
- Sentry error tracking with alerts on Slack
- CloudWatch dashboards for latency, error rate, and traffic
- Postman collection for all endpoints
- Database migration scripts using Alembic
- Readme with setup instructions and architecture diagram
What we ship in this practice.
SaaS billing API for Fintech
Built a FastAPI billing engine for a Series A fintech handling $2M monthly revenue. 20 endpoints for subscription plans, invoicing, and payment methods. Used Stripe Connect, PostgreSQL, and Redis. Reduced failed payment retries by 40%. Stack: FastAPI, Celery, Stripe API, SendGrid.
HIPAA-compliant patient data API
Developed a FHIR-compliant patient records API for a telemedicine startup. 15 endpoints with CCPA and HIPAA audit logs. Handles 500,000 records with sub-100ms response times. Used FastAPI, SQLAlchemy, and AWS KMS for encryption. Stack: FastAPI, Alembic, Redis, AWS ECS, Datadog.
Ecommerce order processing API
Replaced a slow monolithic checkout with a FastAPI microservice for a direct-to-consumer brand. 50 endpoints managing inventory, orders, and returns. Cut page load time from 4 seconds to under 200ms. Stack: FastAPI, RabbitMQ, PostgreSQL, Stripe, Shopify Admin API.
Real-time WebSocket chat for SaaS
Built a WebSocket-based messaging layer for a B2B collaboration platform. Supports 10,000 concurrent connections with Redis Pub/Sub. Latency under 20ms. Stack: FastAPI WebSockets, Redis Pub/Sub, AWS ECS Fargate, CloudFront.
MLS listing sync API for Real Estate
Created a FastAPI ETL pipeline that syncs 1 million+ MLS listings daily. Handles 20+ XML feeds with automatic deduplication. Reduced daily sync time from 8 hours to 45 minutes. Stack: FastAPI, Pandas, Celery, PostgreSQL, S3, Databricks.
Data ingestion API for Logistics
Developed a high-throughput ingestion API for a logistics company processing 50,000 tracking events per hour. Uses Kafka for event streaming and Druid for analytics. Achieved 99.99% uptime in first year. Stack: FastAPI, Kafka, Druid, InfluxDB, Grafana.
Why teams hire us.
Senior engineers only, no juniors
Every FastAPI project is built by a developer with 8+ years of Python experience. No code is written by interns or junior devs. We guarantee it in writing.
Fixed price after a 2-week Roadmap
You pay $5K for the Roadmap phase. At the end, you get a spec and a fixed price. If you don't like it, you keep the spec and pay nothing more. 100% refundable.
Production-grade async from day one
We use async SQLAlchemy sessions, httpx for HTTP calls, and asyncio for background tasks. No blocking I/O. Our APIs handle 10,000 concurrent requests on 2 vCPUs.
Full code ownership and no lock-in
You own all source code, Dockerfiles, CI/CD pipelines, and documentation. No licenses, no subscriptions, no hidden fees. Deploy on your AWS account from day one.
Compliance-ready (HIPAA, PCI, SOC 2)
We build with compliance from the start. Encryption at rest (AES-256), encryption in transit (TLS 1.3), audit logs, and role-based access control. We help you pass audits.
30-day post-launch support included
After deployment, we stay for 30 days. We monitor Sentry errors, fix bugs within 24 hours, and help your team onboard. No extra charge.
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.