Leading Custom API Development DevelopersAPI Development
We build custom APIs that scale to millions of requests. 200+ products shipped with 99.9% uptime.
IRPR builds custom APIs for web and mobile applications using Node.js, Go, and Python. We design RESTful and GraphQL endpoints with Postman documentation and automated testing.
Ships in 10-14 weeks with a fixed price from $60K to $200K depending on complexity. All APIs pass OWASP security audit and include Swagger docs.
We work with startup CTOs needing scalable backend, product managers launching SaaS products, enterprise architects integrating legacy systems, and ecommerce owners connecting third-party services.
Types of software we ship.
REST API for mobile apps
Stateless JSON APIs optimized for iOS and Android. Uses Express.js and PostgreSQL. Supports OAuth 2.0 and rate limiting.
GraphQL gateway for microservices
Single endpoint aggregating multiple services. Built with Apollo Server and Redis caching. Reduces frontend load by 60%.
Real-time WebSocket API
Persistent connections for chat, notifications, and live updates. Uses Socket.io with PostgreSQL pub/sub. Handles 10k concurrent connections.
Third-party API integration layer
Unify Stripe, Salesforce, and HubSpot under one adapter. Built with Adapter pattern and retry logic. Manages 5+ external APIs.
Internal API for legacy system wrappers
Translate legacy SOAP or mainframe protocols to modern REST. Uses AWS Lambda and API Gateway. Reduces migration time by 70%.
B2B API for partner integrations
Secure, versioned APIs with API keys and rate limits. Includes webhook callbacks and usage analytics. Documented with OpenAPI 3.0.
Public API for developer platform
Developed for a fintech company serving 500+ developers. Includes sandbox environment, pagination, and idempotency keys.
Serverless API with AWS Lambda
Pay-per-request architecture using Lambda and DynamoDB. Auto-scales from 0 to 10k requests. Deployed via AWS CDK.
We build for every business type.
Ecommerce
Fintech
Healthcare
SaaS
Logistics
Custom API Development by the Numbers
We have built over 200 custom APIs for clients in 50 countries.
Every API we ship includes load testing, security audit, and comprehensive documentation. Our average delivery time is 12 weeks for a full-featured API with 10+ endpoints.
Clients report 40% faster time-to-market compared to building in-house. Our APIs maintain 99.9% uptime with 24/7 monitoring via Datadog and PagerDuty.
How IRPR Builds APIs Differently
Most agencies skip documentation, security, and performance testing. We do the opposite.
Generic dev shops often ship APIs without load testing or security audits. They use generic frameworks with no customization for your business logic.
IRPR assigns a senior API architect to your project from day one. We deliver Swagger docs, Postman collections, CI/CD pipelines, and a full performance report with every build.
- No API design document
- No load testing
- No security audit (OWASP)
- No documentation beyond code comments
- No monitoring or error tracking
- No post-launch support contract
- Full API specification before coding
- Load test with k6 up to 10k concurrent users
- OWASP top 10 security audit passed
- Swagger/OpenAPI and Postman collection shipped
- Sentry error tracking and Datadog monitoring
- 12 months optional support + SLA
Our API Development Process
From concept to production in 12 weeks with fixed milestones.
Phase 1: We map your data model and define endpoints. You get a detailed API specification document with authentication, rate limits, and error handling.
Phase 2: We build and test each endpoint in staging. You get a demo with real data before production deployment.
What Ships with Every API
You get everything needed to run and maintain your API in production.
No black boxes. You own all code, documentation, and infrastructure scripts. We hand over a complete package on day one of production.
- Source code in your GitHub repository
- Swagger/OpenAPI documentation
- Postman collection with sample requests
- CI/CD pipeline (GitHub Actions or CircleCI)
- Sentry error and performance tracking
- Load test results report (k6)
- Deployment guide and runbook
- Security audit report (OWASP)
- Docker containers for local development
- 12 months optional support SLA
What we ship in this practice.
Real-time Chat API
Built for a healthcare platform to enable secure messaging between doctors and patients. Uses Socket.io, Redis pub/sub, and PostgreSQL. Reduced message latency from 2 seconds to under 100ms.
Payment Gateway API
Integrated for a fintech startup connecting Stripe and Plaid. Handles 50,000 transactions per hour with idempotency and retry logic. Built with Go and PostgreSQL. Achieved PCI-DSS Level 1 compliance.
Inventory Sync API
Created for an ecommerce brand managing 10,000 SKUs across Shopify and Amazon. Uses Node.js and a message queue (RabbitMQ). Reduced inventory errors by 95%.
User Authentication API
Developed for a SaaS platform needing OAuth 2.0 and social login. Built with Auth0, Express.js, and MongoDB. Supports 1 million registered users with 99.99% uptime.
Data Analytics API
Designed for a marketing agency to serve real-time campaign metrics. Uses GraphQL, Elasticsearch, and AWS Lambda. Processes 100GB of data daily with sub-200ms response times.
Shipping Rate API
Built for a logistics company to aggregate rates from FedEx, UPS, and USPS. Uses Python and PostgreSQL. Reduced rate lookup time from 5 seconds to 300ms and saved $20K/month in manual work.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote during the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
We staff each project with engineers who have 10+ years of experience. No junior developers. Our lead API architect has shipped 50+ production APIs.
Full code ownership
You own all source code, documentation, and infrastructure scripts. No licensing fees, no vendor lock-in. We transfer everything to your GitHub.
Built-in compliance
We build APIs to your industry standards: HIPAA, PCI-DSS, SOC 2, or GDPR. Each project includes a compliance checklist and audit report.
Guaranteed delivery timeline
We deliver in 10-14 weeks or we discount your next phase. 98% of our projects finish on time with zero scope creep.
Post-launch support included
Every API comes with 30 days of free bug fixes and performance tuning. Optional extended support with 4-hour SLA available.
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.