Senior Custom API Development StudioAPI Development
We build production-grade custom APIs with senior engineers only. Get your API live in 12 weeks at a fixed price.
IRPR builds custom APIs for platforms that need senior-level engineering. We use Node.js, Python, Go, Postgres, Redis, and AWS to build REST, GraphQL, and gRPC APIs that scale to millions of requests.
Every project ships in 12 weeks at a fixed price between $80K and $250K. We handle compliance for healthcare (HIPAA), payments (PCI-DSS), and SaaS (SOC 2). You get production-ready code with CI/CD, monitoring, and documentation.
Our buyers are CTOs who need a reliable API backend, product managers integrating third-party data, startup founders building a SaaS MVP, and enterprise architects migrating monolithic systems to microservices.
Types of software we ship.
RESTful API
Stateless CRUD endpoints with JSON responses. Built with Express.js or Django REST Framework. Includes OpenAPI specs.
GraphQL API
Flexible query language for frontend-driven apps. Built with Apollo Server or Hasura. Supports real-time subscriptions.
gRPC API
High-performance binary protocol for microservices. Uses Protocol Buffers and gRPC-Web for browser clients.
Webhook System
Event-driven callbacks that notify your partners in real time. Built with Redis Pub/Sub and batch processing.
API Gateway
Single entry point for routing, rate limiting, and auth. Built with Kong, NGINX, or AWS API Gateway.
Microservices API
Decoupled services with message brokers like RabbitMQ or Kafka. Each service independently deployable.
Third-party Integration API
Connects your platform to Stripe, Salesforce, HubSpot, and 100+ others. Handles OAuth and rate limits.
Real-time API
WebSocket or SSE endpoints for live data like chat, notifications, or stock prices. Built with Socket.IO or FastAPI.
We build for every business type.
SaaS Companies
E-commerce Platforms
Healthcare Tech
Fintech Startups
Logistics Providers
Why a Senior Custom API Development Studio Matters
Not all API shops deliver senior-level code. Here is how we measure impact.
A senior custom API development studio like IRPR assigns engineers with 10+ years of experience to every project. We write code that handles 99.9% uptime and passes strict security audits.
Over 200 products shipped across 50+ countries. Our APIs are used by companies in healthcare, finance, and logistics where downtime costs thousands per minute.
Generic Dev Shop vs. Senior Custom API Studio
The difference is experience. Here is what you get with IRPR vs. a generic shop.
A generic dev shop assigns junior developers who learn on your dime. They build an API that works but breaks under load and fails security audits.
IRPR assigns senior engineers who have built 50+ APIs each. We deliver a production-ready API with CI/CD, monitoring, and compliance documentation.
- Junior or mid-level developers
- Hourly billing up to $200/hr
- No fixed timeline or price
- API fails load tests above 1,000 requests
- No security audit
- You own unmaintainable code
- Senior engineers with 10+ years each
- Fixed price from $80K to $250K
- 12-week delivery guarantee
- APIs handle 10,000+ requests per second
- HIPAA/PCI-DSS/SOC 2 compliant
- You own the full source code
How We Build Your Custom API in 4 Phases
Our process eliminates surprises. Each phase has a clear deliverable and a fixed price.
Phase 1: Idea. We map your endpoints, data model, and third-party integrations in a 1-week workshop. You get a technical spec.
Phase 2: Roadmap. Week 2 we produce a timeline with milestones and a fixed quote. No changes after sign-off.
What Ships with Your Custom API
Every API comes with these deliverables. No hidden extras.
We do not hand you code and walk away. You get a fully operable API with all the tools needed to run it.
- Source code in your GitHub repo (private or public)
- CI/CD pipeline on GitHub Actions with automated tests
- Sentry error tracking and Datadog monitoring dashboards
- OpenAPI 3.0 spec (or GraphQL schema) auto-generated from code
- Postman collection for manual testing
- Rate limiting, retry logic, and idempotency keys
- Security: OWASP top 10 protections, secrets vault (AWS Secrets Manager)
- Load test report (k6 or Locust) showing 10,000+ rps
- Deployment scripts for AWS ECS or Lambda (your account)
- Runbook with on-call procedures and rollback steps
What we ship in this practice.
Payment Gateway API for a Fintech Startup
Built a PCI-DSS compliant REST API that processes 5,000 transactions per minute. Integrated with Stripe Connect and Plaid for bank verification. Reduced integration time for new partners from 4 weeks to 3 days.
Patient Data Exchange API for a Telemedicine Platform
Created a HIPAA-compliant FHIR API connecting 12 EHR systems. Handles 2 million patient records with end-to-end encryption. Cut lab result delivery from 24 hours to 90 seconds.
Inventory Sync API for a Multi-warehouse Retailer
Developed a real-time GraphQL API using Hasura and PostgreSQL that syncs stock across 15 warehouses. Reduced overselling by 94% and cut inventory reconciliation from 8 hours to 10 minutes.
Real-time Fleet Tracking API for a Logistics Company
Built a WebSocket API with Node.js and Redis that ingests GPS data from 10,000 trucks. Provides live ETA updates with sub-second latency. Improved on-time delivery from 82% to 97%.
Subscription Billing API for a SaaS Platform
Architected a RESTful API using FastAPI and Celery that handles 50,000 recurring billing events daily. Integrated with Stripe, TaxJar, and QuickBooks. Reduced billing errors by 99%.
Market Data Feed API for a Media Analytics Firm
Delivered a gRPC API in Go that streams 1 million data points per second from financial exchanges. Uses Kafka for buffering and RocksDB for persistence. Latency under 2 milliseconds.
Why teams hire us.
Senior engineers only
Every project gets a lead engineer with 10+ years of experience. We do not hire juniors or outsource. Our team averages 15 years in production API design.
Fixed price, not hourly
We quote a fixed price after the Roadmap phase (week 2). No hourly billing. No surprise invoices. The price includes all changes within scope.
12-week delivery guarantee
We ship your API in 12 weeks from kickoff. If we miss the date, you get 2 weeks of free work. Over 200 projects delivered on time.
HIPAA, PCI-DSS, and SOC 2 compliant
We build APIs that pass audits for healthcare, payments, and SaaS. Our code includes encryption at rest and in transit, logging, and access controls.
Full code ownership
You own everything we write. No license fees. No hidden IP. We put the code directly in your GitHub repository from day one.
2-week kickoff
We start within 2 business days of signing. Your senior lead engineer is assigned immediately. No long onboarding.
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.