Top Custom API Development ConsultantsAPI Development
We build custom APIs for your product. 200+ shipped in 50 countries.
IRPR is a team of senior engineers who design and build custom APIs for your product. We use REST, GraphQL, gRPC, and WebSockets to handle real-time data, third-party integrations, and complex business logic.
Every API project ships in 8-12 weeks with a fixed price from $80K to $250K. We handle compliance for HIPAA, PCI-DSS, SOC 2, and FERPA. You get full source code, CI/CD pipelines, and API documentation.
We work with CTOs who need a scalable backend, product owners integrating with Salesforce or Stripe, and startups launching a SaaS MVP that requires a custom API layer. We also help enterprises modernize legacy APIs.
Types of software we ship.
REST API Development
Stateless HTTP APIs for CRUD operations. Built with Express.js, FastAPI, or Spring Boot. Includes OpenAPI 3.0 specs.
GraphQL API Development
Flexible query-based APIs for frontend teams. Uses Apollo Server, Yoga, or Hasura. Reduces over-fetching by 60%.
WebSocket API Development
Real-time bidirectional APIs for chat, live updates, and notifications. Uses Socket.io, WebSocket API, or AWS API Gateway WebSockets.
gRPC API Development
High-performance RPC APIs for microservices. Uses Protocol Buffers, Envoy, and gRPC-Web. Latency under 10ms.
Third-Party API Integration
Connect your product to Stripe, Salesforce, HubSpot, Twilio, or 200+ other APIs. Handles rate limits, webhooks, and OAuth 2.0.
API Gateway & Management
Centralized gateway for routing, auth, and rate limiting. Uses Kong, AWS API Gateway, or NGINX. Supports 10K+ requests per second.
API Security & Compliance
Secure APIs with OAuth 2.0, JWT, API keys, and mTLS. Compliant with HIPAA, PCI-DSS, SOC 2, and GDPR. Includes penetration testing.
API Documentation & Testing
Auto-generated docs with Swagger/OpenAPI, Postman collections, and integration tests. Includes load testing with k6 or Artillery.
We build for every business type.
SaaS & Enterprise
Ecommerce & Payments
Healthcare & Life Sciences
Fintech & Banking
Media & Content
Why You Need Top Custom API Development Consultants
A well-designed API is the backbone of your product. It connects your frontend to your database, third-party services, and mobile apps.
IRPR has shipped 200+ custom APIs for clients in 50 countries. Our APIs handle 10,000+ requests per second with 99.9% uptime. We use REST, GraphQL, and gRPC to match your use case.
Every API includes OpenAPI documentation, Postman collections, and integration tests. You get full ownership of the code and a CI/CD pipeline on GitHub Actions. No lock-in, no hidden fees.
How IRPR Delivers Custom APIs Differently
Most agencies bill hourly and deliver incomplete work. IRPR uses a fixed-price, roadmap-driven process.
Generic dev shops often start coding without a clear plan. They skip documentation and testing. You end up with a fragile API that breaks in production.
IRPR starts with a 2-week Roadmap phase where we define endpoints, data models, and integration points. We then build in 2-week sprints with automated tests. Every API ships with a full test suite and deployment scripts.
- Hourly billing with no cap
- No API documentation
- Manual testing only
- No CI/CD pipeline
- Ownership unclear
- No compliance support
- Fixed price from $80K
- OpenAPI 3.0 docs included
- Automated integration tests
- CI/CD on GitHub Actions
- Full code ownership
- HIPAA, PCI-DSS, SOC 2 ready
Our API Development Process
We follow a 4-phase process to deliver your custom API in 8-12 weeks.
Phase 1: Roadmap (week 1-2). We define API endpoints, data models, auth flows, and integration points. You get a fixed price and timeline.
Phase 2: Build (week 3-8). We code the API in 2-week sprints with automated tests. You see progress daily on a shared board.
What Ships With Every Custom API
Every API project includes these deliverables by default.
You get full source code in your repository. No black boxes, no proprietary tools. You own everything.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification
- Postman collection with sample requests
- CI/CD pipeline on GitHub Actions
- Sentry error tracking
- Load test results (k6 or Artillery)
- Penetration test report
- Deployment runbook for AWS/GCP/Azure
- API monitoring dashboard (Datadog or Grafana)
- 1 month post-launch support
What we ship in this practice.
Real-Time Chat API for a SaaS Platform
Built a WebSocket API with Socket.io and Redis for a team collaboration tool. Handles 50,000 concurrent connections with 200ms latency. Reduced server costs by 40%.
Payment Gateway API for a Fintech Startup
Designed a REST API with Stripe Connect and Plaid for a lending platform. Processes 10,000 transactions per day. PCI-DSS Level 1 compliant. Shipped in 10 weeks.
Healthcare API for a Telemedicine App
Built a GraphQL API with Apollo Server and FHIR standards for a telehealth provider. Integrates with Epic EHR. HIPAA compliant. Reduced patient data retrieval time by 60%.
Ecommerce API for a Multi-Store Platform
Created a REST API with Shopify integration and custom product catalog. Handles 500,000 SKUs and 2,000 orders per hour. 99.99% uptime over 12 months.
Inventory API for a Logistics Company
Developed a gRPC API with Protocol Buffers and Envoy for real-time inventory tracking. Integrates with 5 warehouse systems. Reduced stock discrepancies by 90%.
Content API for a Media Platform
Built a GraphQL API with Hasura and Cloudflare CDN for a news aggregator. Serves 1 million requests per day. Caching reduced origin load by 70%.
Why teams hire us.
Fixed Price, Not Hourly
Every API project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges.
Senior Engineers Only
Every IRPR engineer has 10+ years of experience. We do not outsource or use junior developers. Your API is built by a senior architect.
Full Code Ownership
You own every line of code. No proprietary frameworks, no lock-in. You can deploy anywhere, anytime.
Compliance Built In
We handle HIPAA, PCI-DSS, SOC 2, and FERPA from day one. No retrofitting. Our APIs pass audits on first review.
200+ APIs Shipped
We have built custom APIs for 200+ products across 50 countries. From startups to Fortune 500 companies.
99.9% Uptime SLA
Every API we ship includes monitoring, alerting, and auto-scaling. We guarantee 99.9% uptime with 4-hour response SLAs.
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.