Senior REST API Development CompanySenior REST API
We build production-grade REST APIs for SaaS, fintech, and healthcare. 8-12 week delivery, fixed price, senior engineers only.
IRPR is a senior REST API development company. We build RESTful APIs using Node.js, Python (FastAPI, Django), Go, and Postgres. Every API ships with OpenAPI 3.0 specs, automated tests, and CI/CD pipelines.
Our fixed-price model means you know the cost from day one. Most REST API projects run 8-12 weeks and cost $80K-$250K. We handle compliance for HIPAA, PCI-DSS, and SOC 2 out of the box.
CTOs scaling their platform hire us when they need production-grade APIs fast. Startup founders use us to build their MVP without hiring a team. Enterprise architects bring us in to modernize legacy systems with clean, versioned APIs.
Types of software we ship.
Public REST API
External-facing API for third-party developers. Includes rate limiting, API keys, and documentation via OpenAPI.
Internal Microservice API
Service-to-service APIs for microservices architecture. Uses gRPC or REST with message queues like RabbitMQ.
API Gateway
Single entry point for multiple backend services. Handles auth, routing, and throttling with Kong or Envoy.
Real-time Data API
REST + WebSocket hybrid for live updates. Used for dashboards, notifications, and IoT data streams.
Payment Gateway API
PCI-compliant API integrating with Stripe, Braintree, or Adyen. Supports recurring billing and fraud detection.
Healthcare FHIR API
HIPAA-compliant API using HL7 FHIR standard. Connects EHRs, lab systems, and patient portals.
Machine Learning Inference API
REST endpoint for model predictions. Built with FastAPI, TensorFlow Serving, and Docker for low-latency inference.
Ecommerce API
Product catalog, cart, order, and inventory APIs. Integrates with Shopify, Magento, and custom backends.
We build for every business type.
SaaS platforms
Fintech
Healthcare
Ecommerce
IoT & Logistics
Why hire a senior REST API development company?
A poorly designed API costs you months of rework. We get it right the first time.
IRPR has shipped over 200 REST APIs across 50+ countries. Our engineers average 10+ years of experience building APIs for fintech, healthcare, and SaaS. Every project includes automated testing, CI/CD, and monitoring from day one.
We use OpenAPI 3.0 to generate client SDKs and documentation automatically. This means your frontend and mobile teams can start integrating before the backend is fully complete. Average time from spec to production is 12 weeks.
The difference between a generic dev shop and a senior REST API team
Most agencies treat APIs as an afterthought. We treat them as the product.
Generic dev shops bill hourly, skip documentation, and hand you code with no tests. You end up with an API that breaks on the first production load. IRPR fixes that with a repeatable process.
We deliver a complete API package: OpenAPI spec, Postman collection, unit tests, integration tests, CI/CD pipeline, and monitoring dashboard. Your team can start using it immediately.
- Hourly billing with no cost cap
- No API documentation or spec
- No versioning strategy
- No automated tests
- No CI/CD pipeline
- No security review
- Fixed price from the Roadmap phase
- OpenAPI 3.0 spec generated automatically
- Semantic versioning with deprecation policy
- Unit + integration tests with 90%+ coverage
- CI/CD pipeline on GitHub Actions
- Security audit and penetration testing
Our REST API development process
From idea to production in 12 weeks. No surprises.
We follow a four-phase process: Discovery, Design, Build, and Deploy. Each phase has clear deliverables and a fixed cost. You know exactly what you're getting and when.
The Roadmap phase (week 1-2) defines the API contract, endpoints, and data model. After sign-off, we build in 2-week sprints with demos every Friday. Production deployment includes monitoring and alerting.
What ships with every REST API project
You get more than code. You get a production-ready system.
Every IRPR REST API project includes everything your team needs to operate independently. No hidden gaps, no missing pieces.
We deliver the full stack: source code, infrastructure as code, monitoring, and documentation. Your engineers can take over on day one.
- Source code in your private GitHub/GitLab repo
- OpenAPI 3.0 specification (YAML/JSON)
- Postman collection with example requests
- Unit tests with 90%+ coverage (Jest, pytest)
- Integration tests using Docker Compose
- CI/CD pipeline (GitHub Actions, GitLab CI)
- Infrastructure as code (Terraform, Pulumi)
- Monitoring dashboard (Datadog, Grafana)
- API documentation hosted on Swagger UI
- Deployment runbook and operational playbook
What we ship in this practice.
Payment Processing API for a Fintech Startup
Built a PCI-compliant REST API handling 10,000 transactions per day. Integrated with Stripe and Plaid. Reduced transaction failures by 30% and cut reconciliation time from 4 hours to 15 minutes. Tech stack: Node.js, Postgres, Redis, Docker.
Patient Data API for a Telehealth Platform
Developed a HIPAA-compliant FHIR API to sync patient records across 3 EHR systems. Eliminated manual data entry, saving nurses 8 hours per week. Tech stack: FastAPI, HL7, AWS HealthLake, Python.
Inventory Sync API for an Ecommerce Marketplace
Created a REST API that syncs 100,000 SKUs across 5 warehouses in real time. Reduced overselling by 95% and eliminated manual inventory updates. Tech stack: Go, Redis, Kafka, PostgreSQL.
Real-time Tracking API for a Logistics Company
Built a WebSocket + REST hybrid API to track 10,000 GPS devices with 50ms latency. Enabled live driver tracking for dispatchers. Tech stack: Node.js, MQTT, TimescaleDB, Grafana.
CRM Integration API for a SaaS Platform
Developed a bidirectional sync API between Salesforce and HubSpot. Reduced data entry errors by 90% and saved sales teams 5 hours per week. Tech stack: Python, Celery, Salesforce REST API, HubSpot API.
ML Inference API for a Media Company
Built a REST API serving 1,000 image classification requests per second with 200ms latency. Integrated with TensorFlow Serving and Kubernetes. Tech stack: FastAPI, TensorFlow, Docker, AWS EKS.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. You know the total cost before we write a line of code.
Senior engineers only
Our team averages 10+ years of experience. We don't outsource or use junior developers. Every engineer has built production APIs for companies handling millions of requests per day.
OpenAPI-first design
We generate your API contract as an OpenAPI 3.0 spec before coding starts. This lets your frontend and mobile teams work in parallel. Client SDKs are generated automatically.
Compliance built in
HIPAA, PCI-DSS, and SOC 2 controls are part of every project. We include encryption at rest and in transit, audit logging, and role-based access control by default.
12-week MVP delivery
From spec to production in 8-12 weeks. We ship a working API with monitoring, docs, and CI/CD. You can start integrating on day one.
Full code ownership
You own all source code, specs, and documentation. No licensing fees, no lock-in. We deploy to your cloud account and hand over the keys.
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.