Senior REST API Development FirmREST API
We build production-grade REST APIs in 8-12 weeks. Fixed pricing, senior engineers only.
IRPR is a senior REST API development firm that builds custom APIs for web and mobile backends using Node.js (Express), Python (FastAPI), and Go (Gin). Every API is designed for scale, with async workers, caching, and database optimization.
We ship fully documented REST APIs with CI/CD pipelines, load testing (k6), and monitoring (Datadog). Typical timeline is 8-12 weeks. Pricing ranges from $80K to $250K. All APIs meet SOC 2 and HIPAA compliance standards.
Our clients include CTOs replacing legacy SOAP APIs, product managers launching SaaS platforms, and engineering leads scaling microservices. We also work with fintech startups needing PCI-DSS compliant payment APIs and healthcare firms requiring FHIR integration.
Types of software we ship.
SaaS Platform REST API
Multi-tenant API with user auth, billing webhooks, and rate limiting. Built with Node.js, PostgreSQL, and Redis.
Payment Gateway API
PCI-DSS compliant API processing 10K+ transactions per minute. Integrates with Stripe and Plaid.
Third-Party Data Aggregation API
Aggregates data from 50+ sources via REST and webhooks. Uses Python, Celery, and MongoDB.
Internal Microservices API Gateway
Central gateway for 20+ microservices with OAuth2 and rate limiting. Deployed on Kubernetes with Envoy.
Real-Time Streaming API
Combines REST endpoints with WebSocket for live updates. Handles 1M events/day using Go and Redis Pub/Sub.
Healthcare FHIR API
HIPAA-compliant FHIR R4 API for EHR integration. Built with FastAPI, PostgreSQL, and SMART on FHIR.
E-Commerce Product Catalog API
REST API managing 100K+ SKUs with faceted search and inventory sync. Uses Elasticsearch and RabbitMQ.
IoT Device Management API
REST API for device registration, telemetry ingestion, and OTA updates. Built with Go, MQTT, and TimescaleDB.
We build for every business type.
Fintech
Healthcare
Ecommerce
SaaS
Logistics
Why hire a senior REST API development firm
Our APIs handle millions of requests daily with 99.9% uptime.
IRPR has built over 200 APIs for clients in fintech, healthcare, and ecommerce. Each API is designed by senior engineers with 10+ years of experience. We use proven patterns like repository, service layer, and middleware chains.
Every API ships with OpenAPI 3.0 documentation, Postman collections, and a CI/CD pipeline. We load test with k6 to ensure your API handles 10K requests per second. No performance surprises at launch.
Generic dev shop vs IRPR
Not all API development is equal. Here is what you get with a senior REST API development firm.
Many agencies assign junior developers to API projects. They skip documentation, avoid load testing, and bill by the hour. The result is an API that breaks in production and costs more than expected.
IRPR assigns senior engineers only. We deliver OpenAPI docs, load test reports, and a fixed price. Your API goes to production on time and on budget.
- No documentation
- No load testing
- Hourly billing
- Junior developers
- No CI/CD
- No monitoring
- OpenAPI 3.0 docs
- Load tested to 10K req/s
- Fixed price
- Senior engineers only (10+ years)
- GitHub Actions CI/CD
- Datadog monitoring
Our API development process
From idea to production in 12 weeks with a senior REST API development firm.
We follow a structured 4-phase process. Each phase ends with a deliverable you review. No black boxes, no surprises.
The Roadmap phase (week 2) locks the scope and price. After that, we build, test, and deploy. You own the code from day one.
What ships with your API
Every project includes these deliverables from IRPR.
You get everything needed to run, maintain, and scale your REST API. No hidden costs, no missing pieces.
- Source code in your GitHub repo
- OpenAPI 3.0 specification
- Postman collection
- CI/CD pipeline (GitHub Actions)
- Docker containers
- Kubernetes manifests
- Sentry error tracking
- Datadog dashboards
- Load test results (k6)
- API documentation site (Stoplight)
What we ship in this practice.
Payment processing API for fintech startup
IRPR built a PCI-DSS compliant REST API that processes 10K transactions per minute. The client reduced transaction failures by 40% and launched 3 weeks ahead of schedule. Tech stack: Node.js, Express, Stripe, PostgreSQL.
Patient data API for telehealth platform
We developed a HIPAA-compliant FHIR API that integrates with 5 EHR systems. The platform now handles 50K patient records daily with sub-100ms response times. Tech stack: FastAPI, FHIR, Redis, PostgreSQL.
Inventory API for ecommerce brand
IRPR created a REST API that syncs 50K SKUs across 3 warehouses in real time. The client cut inventory errors by 90% and improved order fulfillment speed by 60%. Tech stack: Go, MongoDB, RabbitMQ.
User management API for SaaS
We built a multi-tenant REST API with Auth0 integration and role-based access. Onboarding time dropped from 3 days to 2 hours. Tech stack: Django REST, PostgreSQL, Auth0, Celery.
Fleet tracking API for logistics
IRPR delivered a REST API that ingests 1M GPS pings per day from 5K vehicles. The client now provides real-time ETAs to customers with 99.9% uptime. Tech stack: Python, Flask, TimescaleDB, MQTT.
Analytics API for media company
We built a high-performance REST API serving aggregated analytics dashboards. 99th percentile latency is under 50ms for 10M daily events. Tech stack: Node.js, ClickHouse, GraphQL, Redis.
Why teams hire us.
Senior engineers only
Every developer on your project has 10+ years of experience building REST APIs. No juniors, no offshore teams. You talk directly to the engineers writing your code.
Fixed price, not hourly
We quote a fixed price after the 2-week Roadmap phase. No hourly billing, no surprise invoices. If scope changes, we adjust the price before writing a single line of code.
OpenAPI docs by default
Every API ships with auto-generated OpenAPI 3.0 documentation. Your frontend team can start integrating the same day we deploy. No waiting for manual docs.
Load tested to production scale
We test every API with k6 to handle 10K requests per second. You get a load test report showing latency, throughput, and error rates. No performance surprises at launch.
99.9% uptime SLA
We deploy your API on Kubernetes with auto-scaling and health checks. Datadog monitors every endpoint. We guarantee 99.9% uptime in our SLA.
Full code ownership
You own all source code, Docker images, documentation, and CI/CD pipelines. IRPR retains no intellectual property. You can take the code to any team after launch.
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.