Expert FastAPI Development FirmDevelopment Firm
We build high-performance APIs with FastAPI. Get a production-ready MVP in 8-12 weeks, fixed price.
IRPR is an expert FastAPI development firm. We build backend systems using FastAPI, Python 3.12, Pydantic v2, SQLAlchemy 2.0, and async PostgreSQL. Every API is designed for high concurrency and automatic OpenAPI documentation.
We ship production-ready FastAPI applications in 8 to 12 weeks. Pricing is fixed from $80K to $250K depending on scope. Our APIs pass HIPAA, PCI-DSS, and SOC 2 compliance checks before release.
CTOs hire us to replace slow Django monoliths. SaaS founders need a FastAPI microservices foundation. Fintech companies require PCI-compliant payment APIs. Healthcare firms need HIPAA-safe data endpoints.
Types of software we ship.
REST API Backend
Full RESTful API built with FastAPI, Pydantic models, and async SQLAlchemy. Includes JWT auth, rate limiting, and Swagger docs.
Microservices Architecture
Decoupled FastAPI services communicating via RabbitMQ or Kafka. Each service is independently deployable and scalable.
Real-Time WebSocket API
WebSocket endpoints using FastAPI's native support. Used for live chat, notifications, and real-time data streaming.
GraphQL Gateway
GraphQL API powered by Strawberry or Ariadne, backed by FastAPI resolvers. Unifies multiple data sources into one endpoint.
Data Pipeline API
ETL pipelines with FastAPI as the orchestration layer. Integrates with AWS S3, Snowflake, and Apache Spark.
Third-Party Integration API
API wrappers for Stripe, Salesforce, HubSpot, Twilio, and 100+ other services. Built with retry logic and idempotency.
Admin Dashboard Backend
FastAPI backend for admin panels with role-based access control (RBAC), audit logs, and CSV/Excel export.
AI/ML Inference API
FastAPI endpoints serving machine learning models using ONNX Runtime or TensorFlow Serving. Sub-100ms latency.
We build for every business type.
SaaS Platforms
Fintech & Payments
Healthcare & Life Sciences
Ecommerce & Retail
Logistics & Supply Chain
Why Choose an Expert FastAPI Development Firm
FastAPI is fast, but building production-grade APIs requires deep experience with async patterns, database optimization, and deployment.
IRPR has shipped over 200 products using FastAPI since version 0.45. Our senior engineers wrote production code for Python 3.12 async features and Pydantic v2 validation. We know the edge cases: connection pooling under load, lazy loading with SQLAlchemy 2.0, and caching with Redis.
Every FastAPI project includes automatic OpenAPI docs (Swagger + ReDoc), request validation with Pydantic, and background task management with Celery or ARQ. We deploy on AWS ECS or Kubernetes with auto-scaling based on CPU and memory metrics.
The Difference Between a Generic Dev Shop and an Expert FastAPI Firm
Many agencies claim FastAPI expertise but cut corners on async correctness, testing, and deployment.
Generic shops treat FastAPI like Flask with decorators. They miss async context managers, dependency injection patterns, and proper lifespan management. The result: slow endpoints, memory leaks, and broken Swagger docs.
IRPR follows FastAPI best practices from the ground up. We use async generators for database sessions, structlog for structured logging, and pytest-asyncio for full test coverage. Every API is benchmarked with locust before release.
- sync code in async routes
- no background task management
- missing input validation
- no API versioning strategy
- manual deployment scripts
- no performance benchmarks
- fully async routes with proper await
- Celery or ARQ for background tasks
- Pydantic v2 validation on every endpoint
- API versioning via URL or headers
- CI/CD with GitHub Actions and Terraform
- locust load tests before production release
Our FastAPI Development Process
We deliver production-grade FastAPI applications in four phases, each with clear milestones and client sign-offs.
Phase 1 (Idea): We map your API requirements to FastAPI routes, models, and integrations. You get a detailed specification with endpoint signatures and data schemas.
Phase 2 (Roadmap): We design the async architecture, choose the database (PostgreSQL, MongoDB, or DynamoDB), and set up the CI/CD pipeline. Fixed price is locked in week 2.
What Ships with Every FastAPI Project
When you hire IRPR as your expert FastAPI development firm, you get a complete backend system, not just code.
Every delivery includes source code, infrastructure as code, and documentation. We never hand over a half-finished API.
- Full source code in your private GitHub repository
- CI/CD pipeline with GitHub Actions and automated tests
- Docker Compose and Dockerfile for local development
- Terraform scripts for AWS or GCP infrastructure
- Postman collection or OpenAPI spec for API testing
- Sentry error tracking and Datadog monitoring setup
- Database migration scripts (Alembic for PostgreSQL)
- Structured logging with structlog and log aggregation
- Load test results from locust with baseline metrics
- API documentation (Swagger UI and ReDoc) auto-generated
What we ship in this practice.
Subscription Billing API for SaaS
Built a FastAPI backend for a B2B SaaS platform handling 10,000+ subscribers. Integrated Stripe Billing, sent usage-based invoices, and reduced billing errors by 95%. Stack: FastAPI, PostgreSQL, Stripe, Celery.
HIPAA-Compliant Patient Data API
Developed a FastAPI API for a telemedicine startup to exchange EHR data with Epic. Achieved HIPAA compliance with audit logging and encryption. Reduced data sync time from 30 minutes to 45 seconds. Stack: FastAPI, FHIR, AWS KMS, PostgreSQL.
Real-Time Fraud Detection API
Created a FastAPI microservice for a fintech company to score transactions in under 100ms. Integrated with a machine learning model served via ONNX Runtime. Prevented $2M in fraudulent transactions in the first quarter. Stack: FastAPI, ONNX, Redis, Kafka.
Multi-Tenant Ecommerce Catalog API
Built a FastAPI backend for an ecommerce platform serving 500+ merchants. Each tenant has isolated data and custom pricing rules. API handles 5,000 requests/second during Black Friday. Stack: FastAPI, PostgreSQL (schema-per-tenant), Redis, AWS ECS.
Real-Time Tracking API for Logistics
Designed a WebSocket-based FastAPI service for a logistics company to track 10,000+ shipments in real time. Integrated with GPS devices and warehouse scanners. Reduced manual tracking by 80%. Stack: FastAPI WebSockets, MongoDB, Kafka, Mapbox.
Content Moderation API for Social Media
Built a FastAPI backend that processes 1 million posts per day through a moderation pipeline. Uses AWS Rekognition and custom NLP models. Automated 70% of moderation decisions. Stack: FastAPI, AWS Rekognition, Celery, PostgreSQL.
Why teams hire us.
Senior FastAPI Engineers Only
Every engineer on your project has 5+ years of Python experience and has shipped at least 3 production FastAPI applications. We do not outsource or use junior developers.
Fixed Price, Not Hourly
You get a fixed price quote after the Roadmap phase (week 2). No surprise invoices. Our average FastAPI project costs $80K to $250K depending on scope.
8-12 Week MVP Delivery
We ship a production-ready FastAPI API in 8 to 12 weeks. 98% of our projects finish on time. You can start generating revenue faster.
Full Code Ownership
You own every line of code. We put the source code in your GitHub repository from day one. No licensing fees or black boxes.
Compliance Built In
We build FastAPI APIs that pass HIPAA, PCI-DSS, and SOC 2 audits. Our infrastructure includes encryption at rest and in transit, audit logs, and access controls.
99.9% Uptime SLA
We deploy your FastAPI application on auto-scaling infrastructure with monitoring and alerting. Our SLA guarantees 99.9% uptime for production APIs.
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.