Affordable Custom API Development AgencyAPI Development
We build custom APIs for startups and enterprises. Get a working MVP in 8 to 12 weeks starting at $80,000.
IRPR builds custom APIs using Node.js, FastAPI, and Go. We design REST and GraphQL endpoints with PostgreSQL, Redis, and Docker for scalable backend systems.
Every project ships in 8 to 12 weeks with a fixed price from $80,000 to $250,000. We build for HIPAA, PCI DSS, and SOC 2 compliance from day one, including audit logs and encryption.
Startup CTOs hire us to build a public API product. VP of Engineering at a healthcare platform needs a HL7 FHIR API. Founder of a B2B SaaS wants a subscription billing API. Enterprise architects use us to integrate legacy systems with modern microservices.
Types of software we ship.
REST API Development
Build scalable RESTful APIs with clear endpoint design. Use Express.js or FastAPI with PostgreSQL for quick data operations.
GraphQL API Development
Create flexible GraphQL APIs for frontend teams. Use Apollo Server and Prisma to reduce over-fetching and speed up mobile apps.
Payment API Integration
Integrate Stripe, PayPal, or Braintree payment APIs. Handle subscriptions, refunds, and webhooks with idempotency and retry logic.
Third-Party API Integration
Connect your platform to Salesforce, HubSpot, or Slack. We handle OAuth flows, rate limits, and data sync both ways.
Real-Time API (WebSockets)
Build real-time APIs for chat, live updates, or IoT. Use Socket.io or WebSocket with Redis Pub/Sub for low-latency events.
Internal Microservices API
Design internal APIs for microservice architectures. Use gRPC or RabbitMQ with service discovery and circuit breakers.
Public API / Developer Portal
Launch a public API with authentication, rate limiting, and documentation. Include a developer portal with API keys and usage analytics.
Database CRUD API
Auto-generate REST endpoints from your database schema. Use Hasura or PostgREST to speed up backend development by 70%.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Internal Tools
Why Build Custom APIs with IRPR?
We have shipped over 200 APIs across 50 countries.
Every API project starts with a 2-week Roadmap phase where we define endpoints, data models, and security. You receive a fixed price and a clear timeline before any development begins.
We use automated CI/CD pipelines with GitHub Actions, Sentry error tracking, and Docker containers. Your API is production-ready from day one with monitoring and load testing built in.
The Difference Between Generic Dev Shops and IRPR
Most agencies overcharge and under-deliver on API projects.
Generic shops often quote hourly rates and push scope creep. They skip documentation, testing, and compliance until it is too late.
IRPR delivers fixed-price APIs with full documentation, CI/CD, and compliance from day one. You know exactly what you pay and when you ship.
- No fixed pricing, project goes over budget
- Unclear timeline, delays months
- No API documentation standards
- No testing or CI/CD pipeline
- No compliance knowledge (HIPAA, PCI)
- Code ownership unclear
- Fixed price from Roadmap phase
- 8-12 week delivery with milestones
- OpenAPI/Swagger documentation included
- CI/CD with automated testing
- Built for HIPAA/PCI/SOC2 from day one
- Full code ownership on day one
How We Build Your Custom API in 4 Phases
Our process from idea to release takes 10 to 14 weeks max.
We break each project into four phases, each with a clear deliverable and milestone. You see progress every week and can adjust priorities without changing the fixed price.
Every API Project Ships With
You get a complete, production-ready API package.
No hidden deliverables. Every item below is included in the fixed price and delivered before the final milestone.
- Source code in your GitHub or GitLab repo
- OpenAPI/Swagger documentation
- CI/CD pipeline (GitHub Actions)
- Sentry error tracking
- Docker container setup
- Postman collection for testing
- Load testing report (10,000 requests/min)
- API monitoring dashboard (Datadog or New Relic)
- Security audit report (OWASP top 10 scan)
- Deployment guide with runbooks
What we ship in this practice.
Patient Data Exchange API
We built a FHIR-compliant API for a telemedicine startup. It reduced patient data retrieval time from 5 minutes to 2 seconds using Node.js, PostgreSQL, and Azure FHIR service.
Payment Gateway Aggregation API
Built an API that aggregates Stripe, PayPal, and Square payments for a fintech. It saved the team 20 hours per week of manual reconciliation using NestJS, Redis, and AWS Lambda.
Ecommerce Product Catalog API
Created a headless API for an online retailer serving 50,000 SKUs. It improved page load times by 60% using GraphQL, MongoDB, and Vercel edge functions.
SaaS Billing API
Developed a subscription billing API with metered usage for a B2B SaaS. It reduced churn by 15% through real-time usage notifications using Django, Celery, and Stripe Billing.
Real Estate MLS Integration API
Built an API to sync MLS listings across 5 brokerages. It eliminated manual data entry for 200+ agents using PostgreSQL, Redis, and Retool.
Manufacturing IoT Data API
Created an API to collect and process sensor data from 500+ machines. It enabled real-time predictive maintenance alerts using Python, MQTT, and TimescaleDB.
Why teams hire us.
Fixed Price, No Surprises
Every API project gets a fixed quote after the Roadmap phase (week 2). You never pay more than agreed, even if we add features mid-way.
8-12 Week Delivery
We ship production-ready APIs in 8 to 12 weeks. Our record is a full REST API with authentication in 6 weeks for a healthcare startup.
Compliance Built In
We build HIPAA-compliant APIs with audit logs, encryption at rest and in transit, and BAA agreements. For fintech, we follow PCI DSS Level 1 standards automatically.
Full Documentation & Tests
Every API ships with OpenAPI/Swagger docs, Postman collections, and a test suite with 100% coverage on critical paths. Your team can onboard in hours.
Production-Grade Infrastructure
We deploy on AWS or Azure with auto-scaling, load balancers, and CloudFront CDN. APIs handle 10,000 requests per minute without degradation.
You Own Everything
Source code, documentation, Docker images, and CI/CD config are all yours. No lock-in, no license fees, no ongoing royalty payments.
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.