Senior FastAPI Development VendorFastAPI Vendor
We build production-grade APIs with FastAPI. Six years of Python async experience, average 12-week delivery.
IRPR is a senior FastAPI development vendor. We build high-performance Python APIs using FastAPI, Pydantic V2, SQLAlchemy async, and Redis for caching. Every API is designed for concurrency, type safety, and automatic OpenAPI documentation.
We ship a complete API product in 8-12 weeks with a fixed price of $80K-$150K. Deliverables include source code in your repo, CI/CD pipeline, Sentry error tracking, and integration tests. Compliance is standard: HIPAA, PCI-DSS, SOC 2, or SOC 2 Type II if needed.
Who hires us: CTOs who need a scalable API backend to replace a legacy system. Engineering leads who want a senior team to build microservices for a SaaS platform. Startup founders who need a production-grade API before the next funding round. Product managers who have a strict compliance deadline.
Types of software we ship.
RESTful API with FastAPI
Full CRUD APIs with async endpoints, request validation via Pydantic, and automatic OpenAPI docs. Integrated with PostgreSQL, Redis, and JWT auth.
Microservices architecture
Decoupled services using FastAPI, RabbitMQ or Kafka for event-driven communication, and Docker/Kubernetes for deployment. Scales horizontally.
Data ingestion pipeline
High-throughput ETL pipelines using FastAPI async endpoints, Celery for background tasks, and S3 or Snowflake for storage. Handles millions of records/day.
Real-time API with WebSockets
WebSocket APIs built on FastAPI for real-time dashboards, live notifications, and chat. Uses Redis Pub/Sub and async database drivers.
AI/ML inference API
FastAPI endpoints serving ML models with ONNX, TensorFlow, or PyTorch. Includes model caching, batch processing, and input validation.
Third-party integration API
APIs that integrate with Stripe, Salesforce, HubSpot, or healthcare HL7 FHIR. Handles OAuth, webhooks, and rate limiting.
Admin dashboard backend
FastAPI backend with SQLAdmin or custom admin views, role-based access control, and audit logging. Ships with Swagger UI for internal testing.
GraphQL wrapper on FastAPI
GraphQL API using Strawberry or Ariadne, backed by FastAPI for REST fallback. Supports subscriptions and federated schemas.
We build for every business type.
Healthcare
Fintech
SaaS
Ecommerce
Real Estate
Why choose a senior FastAPI development vendor
Senior FastAPI development means your API is built with best practices from day one.
IRPR has engineers who contributed to FastAPI or maintain Python async libraries. We have built over 200 products using FastAPI since version 0.90. Every project uses Pydantic V2 for strict validation and serialization, SQLAlchemy 2.0 async for database access, and Alembic for migrations.
Our vendor team ships code that passes your CI checks, includes 80%+ test coverage, and is documented automatically via OpenAPI. We deploy on AWS ECS, Azure Kubernetes, or your own servers. Uptime is guaranteed at 99.9% when using our cloud setup.
Senior vendor vs generic agency
Not every agency can deliver senior-level FastAPI work. Here is the real difference.
A generic agency often assigns junior developers who learn FastAPI on the job. They ship slow synchronous code, missing async patterns and proper dependency injection. Testing is minimal, and documentation is an afterthought.
IRPR assigns senior Python engineers who have shipped FastAPI to production at scale. We write every endpoint with async def, use dependency injection via Depends, and build tests with pytest-asyncio. Each API is production-ready and includes Dockerfile, health check, and Prometheus metrics.
- Junior devs learning FastAPI
- Synchronous endpoints kill performance
- No schema validation or Pydantic
- Manual deployment scripts
- Zero error monitoring
- No async database access
- Senior engineers with 6+ years Python async
- All endpoints async with proper concurrency
- Pydantic V2 for request/response validation
- Automated CI/CD with GitHub Actions
- Sentry + Prometheus from day one
- SQLAlchemy async + Alembic migrations
Our process for senior FastAPI projects
We follow a structured 4-phase process to deliver high-quality APIs on time.
Every FastAPI project starts with a Roadmap phase (week 1-2). We define endpoints, data models, and integration points. You get a fixed price and timeline before any code is written.
We build the MVP in 8-12 weeks with weekly demos. After launch, we provide 30 days of support. Code ownership is fully transferred.
What ships with every FastAPI project
You get a complete, production-ready API, not just code.
Every project includes the full source code, infrastructure-as-code, and monitoring setup. No black boxes, no proprietary frameworks.
We deliver everything needed to run the API in production. You can deploy, maintain, and extend it without any vendor lock-in.
- Source code in your private GitHub repo
- CI/CD pipeline with GitHub Actions (lint, test, build, deploy)
- Dockerfile and docker-compose for local dev
- Alembic migration scripts for database schema
- Sentry error tracking and performance monitoring
- Prometheus metrics endpoint for custom monitoring
- OpenAPI 3.0 specification (auto-generated)
- Integration tests with pytest-asyncio (80%+ coverage)
- Health check endpoint (/health)
- Runbook and deployment documentation
What we ship in this practice.
HIPAA-compliant patient portal API
Built a FastAPI backend for a telehealth startup handling 50K patient records. Used async SQLAlchemy with PostgreSQL, JWT with B2C tenant isolation, and FHIR R4 for EHR integration. Reduced data retrieval latency by 60% compared to the previous Django REST setup.
Real-time fraud detection microservice
Developed a FastAPI microservice for a fintech company that processes 2000 transactions/second. Used Redis Streams for event queue and Celery for batch verification. Detected fraud in under 300ms, saving 15% in chargeback costs.
Multi-tenant subscription management API
Created a SaaS billing backend with FastAPI and Stripe integration. Handles 10K tenants with per-tenant rate limiting. Automates invoicing and proration. Cut billing ops overhead by 30 hours per week.
Ecommerce product search API with Elasticsearch
Built a FastAPI service using async Elasticsearch client for full-text product search. Indexed 500K products with faceted filters. Average search latency under 50ms. Increased conversion rate by 12%.
ML model inference API for manufacturing
Deployed a computer vision model via FastAPI for defect detection on a factory line. Used ONNX Runtime and batching. Achieved 100ms inference per image. Reduced manual inspection time by 80%.
Real-time dashboard backend for media monitoring
Designed a WebSocket API using FastAPI to push live social media sentiment scores to a React dashboard. Integrated with Twitter API and Kafka. Delivered updates every 2 seconds. Replaced a polling system that consumed 10x server resources.
Why teams hire us.
Senior FastAPI engineers, not juniors
Every engineer on your project has 6+ years of Python async experience and has contributed to open-source FastAPI libraries. We do not train new hires on your project.
Fixed price, no hourly billing
You get a fixed quote in the Roadmap phase. No surprise invoices. The price covers the entire build, including revisions during the sprint.
Async-first by default
Every endpoint uses async def with proper task scheduling. We use SQLAlchemy async, async Redis, and httpx for non-blocking I/O. Your API handles 10x more concurrent users with the same hardware.
Test coverage as a deliverable
We ship 80%+ test coverage with pytest-asyncio, mocking, and integration tests. Your CI will catch regressions before deployment.
Compliance built-in
Our FastAPI projects include audit logging, encrypted secrets management, and role-based access control. We have shipped HIPAA, PCI, and SOC 2 APIS for clients in regulated industries.
Full code ownership from day one
All code is written in your repository under your account. No proprietary frameworks. You can take the code and run it with any team after the project ends.
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.