Senior Custom API Development ServicesAPI Development
We build production-grade APIs with senior engineers only. Get a fixed price for your API project in 2 weeks.
IRPR builds custom APIs using Node.js, Python FastAPI, Go, and GraphQL. Our senior engineers design RESTful and event-driven architectures that handle 10,000+ requests per second with sub-50ms latency.
Every API project ships with a fixed price defined during the Roadmap phase (week 2). Typical budgets range from $80,000 to $250,000 for a production-ready API with documentation, monitoring, and CI/CD pipelines. We comply with HIPAA, PCI-DSS, and SOC 2 standards.
CTOs who need a secure integration layer hire us. Product managers who want to launch a SaaS platform with a scalable backend hire us. Startup founders who require a custom API for their mobile app hire us. Enterprise architects who need to replace legacy SOAP APIs with modern REST/GraphQL hire us.
Types of software we ship.
REST API Development
Build stateless REST APIs with Node.js and PostgreSQL. Supports OAuth 2.0, rate limiting, and Swagger docs.
GraphQL API Development
Create flexible GraphQL APIs with Apollo Server and Prisma. Reduces over-fetching by up to 60%.
Microservices API Gateway
Deploy an API gateway using Kong or Envoy. Routes traffic to 10+ microservices with authentication.
Third-Party API Integration
Connect your app to Stripe, Salesforce, HubSpot, or Twilio. Handles webhooks, retries, and idempotency.
Real-Time API with WebSockets
Build WebSocket APIs for live dashboards and chat. Uses Socket.IO with Redis pub/sub for scalability.
Enterprise API Security Audit
Audit existing APIs for OWASP Top 10 vulnerabilities. Implements JWT, API keys, and IP whitelisting.
API Documentation Portal
Generate interactive API docs using Stoplight or Redoc. Includes code samples in Python, JavaScript, and cURL.
Serverless API Development
Build serverless APIs on AWS Lambda or Cloudflare Workers. Auto-scales from 0 to 100,000 requests with no cold starts.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics and Real Estate
Why Senior Custom API Development Services Matter
A poorly designed API costs you time, security, and revenue. Senior engineers build APIs that last.
Junior developers often create monolithic APIs with tight coupling and no error handling. IRPR assigns senior engineers with 10+ years of experience who design APIs using clean architecture patterns. Each API includes automated tests, rate limiting, and structured error responses.
We have shipped over 200 products across 50 countries. Our APIs handle 50 million requests per month for a fintech client in New York. For a healthcare client in Los Angeles, we built a HIPAA-compliant FHIR API that reduced data access latency by 70%.
Every API we build ships with a monitoring dashboard using Datadog or New Relic. You get real-time alerts on p99 latency, error rates, and throughput. No surprises in production.
Generic Dev Shop vs IRPR Senior API Team
Not all API development teams are equal. Here is the difference.
Generic dev shops often assign junior developers with no API design experience. They skip documentation, ignore security best practices, and deliver a monolithic endpoint that is hard to maintain.
IRPR assigns senior engineers who have built APIs for Fortune 500 companies. We write automated tests, enforce rate limiting, and produce OpenAPI 3.0 documentation by default. Our APIs are designed to scale from day one.
- Junior developers with 1-3 years experience
- No API documentation or outdated Swagger
- No rate limiting or security headers
- Monolithic endpoints with tight coupling
- No CI/CD pipeline for API deployment
- Hourly billing with unknown total cost
- Senior engineers with 10+ years experience
- OpenAPI 3.0 docs with interactive examples
- Rate limiting, JWT, OAuth 2.0, IP whitelisting
- Clean microservices or modular monolith design
- CI/CD pipeline with GitHub Actions and automated tests
- Fixed price defined in week 2 Roadmap
Our 4-Phase API Development Process
From idea to production API in 8-12 weeks. Fixed scope, fixed price.
We follow a structured process that eliminates guesswork. Each phase has clear deliverables and a go/no-go decision point.
You know exactly what you are paying for and when you will get it. No scope creep, no hidden fees.
What Ships With Every API Project
Every API project includes these deliverables by default. No add-ons, no hidden costs.
- Source code in your GitHub repository with full commit history
- OpenAPI 3.0 documentation with interactive Swagger UI
- CI/CD pipeline using GitHub Actions with automated tests
- Dockerized API with Docker Compose for local development
- Rate limiting (1000 req/min per user by default)
- JWT authentication with refresh tokens
- Sentry error tracking with alerting
- Datadog monitoring dashboard for p50, p95, p99 latency
- Postman collection with example requests
- 30-day post-launch support and bug fixes
What we ship in this practice.
Patient Data API for Telemedicine
Built a HIPAA-compliant FHIR API that connects a telemedicine app to Epic EHR. Reduced patient data retrieval time from 12 seconds to 1.2 seconds. Tech stack: Node.js, PostgreSQL, AWS Lambda, Twilio Video.
Payment Processing API for Fintech
Developed a PCI-DSS compliant payment API that processes 10,000 transactions per day. Integrated with Stripe and Plaid for ACH transfers. Tech stack: Python FastAPI, Redis, AWS ECS, Stripe API.
Order Management API for Ecommerce
Created a REST API that syncs orders between Shopify and a custom warehouse management system. Reduced manual data entry by 20 hours per week. Tech stack: Ruby on Rails, PostgreSQL, Shopify API, FedEx API.
Multi-Tenant API for SaaS Platform
Designed a GraphQL API that serves 500+ tenants with isolated data stores. Each tenant gets their own database schema. Tech stack: Apollo Server, Prisma, PostgreSQL, Redis, AWS RDS.
MLS Data API for Real Estate
Built a real-time API that aggregates MLS listings from 3 different providers into a single search endpoint. Reduced listing sync time from 4 hours to 15 minutes. Tech stack: Go, PostgreSQL, RabbitMQ, Elasticsearch.
Learning Management API for EdTech
Developed a FERPA-compliant API for a university LMS that serves 20,000 students. Integrates with Canvas and Blackboard for grade sync. Tech stack: Node.js, MongoDB, AWS S3, SendGrid API.
Why teams hire us.
Senior Engineers Only, No Juniors
Every engineer on your project has 10+ years of experience building APIs for companies like Stripe and Salesforce. We do not outsource or offshore. You talk directly to the engineer writing your code.
Fixed Price from Week 2
After the Roadmap phase (week 2), you get a fixed price for the entire API project. No hourly billing, no surprise invoices, no scope creep charges.
HIPAA, PCI-DSS, SOC 2 Ready
We build APIs that pass compliance audits. Our healthcare APIs include BAA agreements. Our fintech APIs are PCI-DSS Level 1 compliant. We handle SOC 2 Type II documentation.
Production Monitoring Included
Every API ships with Datadog dashboards, Sentry error tracking, and PagerDuty alerts. You get real-time visibility into p99 latency, error rates, and throughput.
8-12 Week MVP Delivery
Most API projects go from idea to production in 8-12 weeks. You get a working API with documentation, tests, and monitoring. No waiting 6 months for a single endpoint.
Full Code Ownership
You own every line of code we write. We push to your GitHub repository from day one. No licensing fees, no vendor lock-in, no hidden terms.
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.