Top Custom API Development AgencyAPI Development
We build production-grade APIs that power your product. 200+ API integrations shipped for startups and enterprises.
IRPR is a top custom API development agency. We build production-grade APIs using Node.js, Python, Go, and TypeScript. Every API is designed with OpenAPI 3.0 specification and integrates with services like Stripe, Salesforce, Twilio, and AWS Lambda.
We ship your custom API in 8-12 weeks with full documentation, automated tests, and production monitoring. Pricing is fixed from $80K to $250K depending on endpoint count and integrations. We build HIPAA, PCI-DSS, and SOC 2 compliant APIs.
Who hires us: CTOs who need to scale their backend infrastructure. Founders launching a SaaS MVP with a custom API. Healthcare companies requiring HIPAA-compliant data exchange. Fintech firms needing PCI-compliant payment APIs.
Types of software we ship.
REST API Development
Standard RESTful APIs with OpenAPI documentation. We use Express, Fastify, or Django REST framework for clean endpoint design.
GraphQL API Development
Flexible GraphQL APIs with Apollo Server or Hasura. Enable clients to query exactly what they need from a single endpoint.
Webhook & Event-Driven API
Real-time webhook systems using Kafka, RabbitMQ, or AWS EventBridge. Deliver data to subscribers instantly on events.
Payment Gateway API Integration
PCI-compliant integrations with Stripe, Braintree, PayPal, and Adyen. Handle subscriptions, refunds, and fraud detection.
Third-Party API Aggregation
Unify data from multiple external APIs into one consistent interface. Use Redis caching and rate limiting for reliability.
Internal Microservice API
Design gRPC or REST microservices for internal communication. We use Docker, Kubernetes, and service mesh for scalability.
Real-Time API (WebSockets)
Low-latency WebSocket APIs using Socket.io or AWS API Gateway WebSockets. Ideal for chat, notifications, and live dashboards.
Data API / ETL API
Data pipelines with Apache Airflow or AWS Glue. Expose clean, aggregated data via REST endpoints for analytics and BI tools.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Enterprise & Media
Why we are the top custom API development agency
Our track record speaks for itself: 200+ API projects delivered on time and on budget.
We have built custom APIs for startups that scaled to millions of users and for enterprises requiring strict compliance. Our team averages 10+ years of backend engineering experience.
Every API we ship is documented in OpenAPI, tested for load, and monitored in production. We guarantee 99.9% uptime and include post-launch support.
The difference between generic dev shops and IRPR
Most agencies deliver amateur APIs. IRPR delivers production-ready systems with full documentation and monitoring.
Generic shops often skip API design standards and ship endpoints with no documentation or tests. You end up with technical debt and hidden costs.
With IRPR, you get an API designed for scale from day one. We use OpenAPI, automated CI/CD, and security audits as standard practice.
- No API design standards
- Poor or missing documentation
- No load testing
- Scope creep without fixed price
- Unclear code ownership
- Deliveries often 6+ months
- OpenAPI Specification from day one
- Auto-generated API docs (Swagger)
- Load tested for 1000+ concurrent users
- Fixed price in Roadmap phase
- Full source code ownership
- 8-12 week delivery guaranteed
How we build custom APIs for your business
Our process produces a production-ready API in 8-12 weeks with zero surprises.
We start with a discovery sprint to map out every endpoint, data flow, and security requirement. You receive a detailed API specification and fixed price quote.
Development happens in weekly sprints with live API demos. We deploy to production only after passing load tests, security audits, and integration tests.
What ships with your custom API
You get a complete, production-ready system — not just code.
Every API project delivers full source code, infrastructure as code, and operational tooling. No hand-waving, no missing pieces.
- Source code in your GitHub repository
- CI/CD pipeline (GitHub Actions or GitLab CI)
- API documentation (Swagger/OpenAPI UI)
- Postman collection for testing
- Unit and integration tests (Jest, Mocha)
- Load test results (k6 or Artillery)
- Deployment scripts (Terraform or Pulumi)
- Monitoring dashboards (Datadog, Grafana)
- Sentry error tracking setup
- Production infrastructure (AWS ECS / GCP Cloud Run)
What we ship in this practice.
Payment Processing API
Built a PCI-compliant payment API for a fintech startup. Reduced transaction failure rate from 2.5% to 0.3%. Stack: Node.js, Stripe Connect, PostgreSQL, Redis.
Healthcare FHIR API
Developed a HIPAA-compliant FHIR API for a telemedicine platform. Connected 500+ clinics with EHR integration. Stack: Express, MongoDB, AWS HealthLake.
Real-Time Chat API
Created a WebSocket-based chat API for a SaaS collaboration tool. Handled 50k concurrent users with <50ms latency. Stack: Node.js, Socket.io, Redis, AWS ECS.
Inventory Management API
Built RESTful inventory API for an ecommerce company serving 10k SKUs. Reduced stock discrepancy to 0.1%. Stack: Go, MySQL, RabbitMQ, Docker.
Analytics Data API
Designed a GraphQL analytics API for a marketing platform. Enabled real-time dashboard with <2s query time over 10M records. Stack: GraphQL, ClickHouse, Node.js, AWS Lambda.
CRM Integration API
Built a bidirectional sync API between Salesforce and a trade association's database. Automated data entry saving 20 hrs/week. Stack: Python, Salesforce REST API, PostgreSQL, Celery.
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.
Production-grade APIs
We use OpenAPI specification, thorough testing, and CI/CD. Our APIs maintain 99.9% uptime with monitoring and alerting.
Full code ownership
You own all source code and IP. We deliver everything to your GitHub repository with no licensing fees or vendor lock-in.
Senior engineers only
Our team averages 10+ years experience in backend development. No junior developers touch your API project.
Rapid delivery
Most APIs go live in 8-12 weeks. We ship iteratively with weekly demos so you see progress from the first sprint.
Compliance built-in
We build HIPAA, PCI-DSS, and SOC 2 compliant APIs. Our process includes audit trails, encryption, access control, and pen testing.
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.