Custom API Development ServicesDevelopment Services
Build custom APIs that connect your systems and automate workflows. Ship in 8-12 weeks with fixed pricing and full code ownership.
IRPR builds custom APIs using REST, GraphQL, and gRPC protocols. We design for high throughput, low latency, and security from day one with Node.js, Express, Apollo Server, and PostgreSQL.
We deliver your API with full documentation, CI/CD pipelines, and monitoring in 8-12 weeks. Projects start at $80,000 and go up to $250,000 depending on complexity. Our APIs meet PCI-DSS, HIPAA, and SOC 2 standards.
Fintech companies need PCI-compliant payment APIs. Healthcare platforms require HIPAA-secure data exchange. SaaS businesses build public APIs for third-party integrations. Ecommerce stores connect inventory, shipping, and payment systems. We serve all these buyers with senior engineers and fixed pricing.
Types of software we ship.
REST API
Stateless endpoints for CRUD operations. Built with Node.js, Express, and PostgreSQL.
GraphQL API
Flexible queries from the client side. Built with Apollo Server, Prisma, and Redis caching.
Microservice API
Decoupled services communicating via gRPC or message queues. Deployed on Docker and Kubernetes.
Webhook Service
Event-driven callbacks that notify external systems. Using Stripe, Slack, or custom endpoints.
API Gateway
Single entry point for multiple microservices. Handles authentication, rate limiting, and routing via Kong or AWS API Gateway.
Data Integration API
Connects CRM, ERP, and marketing tools. Uses MuleSoft, Zapier, or custom ETL pipelines.
Real-time API (WebSocket)
Live data streaming for chat, notifications, or financial tickers. Built with Socket.io, Redis Pub/Sub, and Nginx.
ML/AI API
Model inference endpoints for predictions, NLP, or image recognition. Using TensorFlow Serving or FastAPI with ONNX.
We build for every business type.
Fintech
Healthcare
Ecommerce
SaaS Product
Logistics & Real Estate
Why custom API development services pay off
Measurable outcomes from 200+ projects.
Every custom API we build reduces manual data entry and accelerates system integrations. Our clients report up to 80% fewer spreadsheets and email chains after launch.
With IRPR, you get a fixed price, a 12-week timeline, and APIs that handle millions of requests per day. We have shipped APIs for fintech, healthcare, and ecommerce companies across 50 countries.
How IRPR compares with generic API shops
Many agencies promise custom APIs but deliver generic solutions. IRPR is different.
Generic dev shops often start coding without a clear spec and bill hourly. You end up with incomplete documentation, no CI/CD, and unclear ownership.
IRPR starts with a 2-week Roadmap phase where we define every endpoint, data model, and auth flow. You get a fixed quote, senior engineers, and full code ownership.
- Hourly billing with no cap
- Junior developers learning on the job
- No documentation
- No CI/CD
- No monitoring
- Code ownership unclear
- Fixed price from day one
- Senior engineers only, 10+ years experience
- OpenAPI/Swagger docs included
- CI/CD pipeline on GitHub Actions
- Sentry and Datadog monitoring
- You own all code and IP
Our custom API development process
We build your API in four phases, each with a clear milestone.
Every phase includes a checkpoint with your team. No surprises, no scope creep.
You see working endpoints by week 3 and can start integration testing before the final release.
What ships with every custom API
Every project ships with a complete developer toolkit.
You get everything needed to maintain and extend your API in-house. No black boxes, no dependencies on IRPR.
- OpenAPI/Swagger documentation
- CI/CD pipeline on GitHub Actions
- Postman collection
- Rate limiting and throttling config
- Error tracking with Sentry
- Logging with Datadog or ELK
- Load testing report (k6/Artillery)
- Docker Compose for local dev
- Terraform scripts for cloud infra
- Source code in your private GitHub repo
What we ship in this practice.
Payment Gateway API
Built a PCI-compliant payment API for a fintech startup handling 10,000 transactions per day. Reduced failed payments by 30% using intelligent retry logic with Stripe and AWS Lambda.
Healthcare Data Exchange API
Designed a HIPAA-compliant API for a telehealth platform connecting 500+ clinics. Cut patient data access time from 4 minutes to 12 seconds using FHIR and GraphQL.
Ecommerce Inventory Sync API
Created a real-time inventory sync API for a multichannel retailer integrating Shopify, Amazon, and warehouse systems. Eliminated 8 hours/week of manual data entry using webhooks and RabbitMQ.
SaaS Public API
Built a public REST API for a subscription analytics platform used by 200+ customers. Onboarded third-party developers in 2 days with interactive docs and usage tracking via Postman and MongoDB.
Logistics Tracking API
Developed a real-time tracking API for a logistics company processing 50,000 shipments daily. Integrated with GPS devices and mapping APIs (Google Maps, Mapbox). Reduced customer support tickets by 40%.
Real Estate MLS API
Architected a high-volume API pulling listing data from 20+ MLS databases. Enabled a real estate platform to display 1.5 million listings with sub-second query times using Elasticsearch and Node.js.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote after the Roadmap phase (week 2). No hourly billing, no surprise invoices.
Senior engineers only
All engineers have 10+ years of experience building APIs at scale. No junior developers learning on your project.
Full code ownership
You own every line of code, every config file, and full IP. We transfer to your GitHub repo on completion.
Built for compliance
APIs are designed to meet HIPAA, PCI-DSS, and SOC 2 controls from day one. We document every compliance requirement.
Post-delivery support
We provide 30 days of free bug fixes and documentation updates after launch. Extended support plans available.
Proven track record
200+ APIs shipped across fintech, healthcare, ecommerce, and real estate. 98% of projects delivered on time.
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.