Expert Custom API Development AgencyAPI Development
We build custom APIs that connect your apps and automate your workflows. 200+ APIs shipped in 12 weeks or less.
IRPR is an expert custom API development agency. We build REST, GraphQL, and gRPC APIs using Node.js, Python, Go, and .NET. Every API is designed for scalability, security, and low latency.
We ship production-ready APIs in 8 to 12 weeks. Fixed pricing starts at $80K and goes to $250K depending on complexity. All APIs come with OpenAPI/Swagger docs, Postman collections, and automated tests. We handle HIPAA, PCI-DSS, SOC 2, and FERPA compliance.
CTOs hire us when their in-house team lacks API expertise. Startup founders hire us to build the backend of their SaaS product. Enterprise architects hire us to integrate legacy systems with modern microservices. Product managers hire us to add Stripe, Salesforce, or HubSpot integrations.
Types of software we ship.
REST API Development
Build stateless RESTful APIs with Express.js or FastAPI. Includes HATEOAS, pagination, and rate limiting.
GraphQL API Development
Flexible GraphQL APIs using Apollo Server or Yoga. Supports subscriptions, resolvers, and schema stitching.
gRPC API Development
High-performance gRPC APIs with Protocol Buffers. Ideal for microservices and real-time streaming.
API Integration & Middleware
Connect third-party services like Stripe, Twilio, Salesforce, HubSpot, and Slack. Includes webhook handling.
Microservices API Gateway
Centralized API gateway using Kong or AWS API Gateway. Handles auth, throttling, and service discovery.
Internal API Development
Private APIs for internal tools and data pipelines. Uses JWT or OAuth2 authentication.
Public API / Developer Portal
Build public APIs with developer documentation, API keys, and usage analytics. Powered by Swagger UI.
Real-time API (WebSocket)
Real-time APIs using WebSockets or Server-Sent Events. Designed for live dashboards, chat, and notifications.
We build for every business type.
SaaS & Platforms
Healthcare & Life Sciences
Finance & Fintech
Ecommerce & Retail
Enterprise & Logistics
Why Choose IRPR as Your Expert Custom API Development Agency
We deliver APIs that are secure, documented, and ready for production.
IRPR has built over 200 custom APIs for clients in 50+ countries. Our APIs handle millions of requests per day with 99.9% uptime. We use OpenAPI 3.0 for documentation and Postman collections for testing.
Every API we build includes automated CI/CD pipelines on GitHub Actions, Sentry error tracking, and Datadog monitoring. We also provide a Postman collection and a detailed integration guide.
How IRPR Differs from Other API Agencies
Most agencies overpromise and underdeliver. IRPR ships on time and on budget.
Generic dev shops often start coding without a clear spec. They use hourly billing and change scope mid-project. You end up with an API that lacks documentation, tests, or security reviews.
IRPR uses a fixed-price model after a 2-week Roadmap phase. We write OpenAPI specs before any code. Every API includes automated tests, security scans, and deployment scripts.
- Hourly billing with no cost cap
- No API contract before coding
- Thin or missing documentation
- No automated tests
- No CI/CD pipeline
- No post-launch monitoring
- Fixed price from Roadmap phase
- OpenAPI spec signed off before code
- Full Swagger UI & Postman collection
- Automated unit + integration tests
- GitHub Actions CI/CD included
- Sentry + Datadog monitoring
Our API Development Process: From Spec to Production
We follow a 4-phase process that eliminates surprises.
Every project starts with a 2-week Roadmap where we define endpoints, data models, and auth flows. You get a fixed price and timeline before any code is written.
We then build the API in 6-8 weeks, with weekly demos and a staging environment. After testing, we deploy to production and hand over full ownership.
What Ships with Every Custom API
You get more than just code. Every API includes a full delivery package.
We don't just hand over a GitHub repo. Every API project includes documentation, tests, monitoring, and deployment scripts. You can run the API yourself or let us manage it.
All source code is owned by you. We provide a 30-day post-launch warranty for bug fixes.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification (Swagger UI)
- Postman collection with example requests
- CI/CD pipeline on GitHub Actions
- Automated unit and integration tests (Jest/Pytest)
- Docker Compose for local development
- Sentry error tracking integration
- Datadog monitoring dashboard
- Deployment runbook for AWS/GCP/Azure
- 30-day post-launch bug fix warranty
What we ship in this practice.
Payment Gateway API for Fintech Startup
Built a RESTful payment API with Stripe Connect integration. Handles 10,000+ transactions per day with 99.9% uptime. Reduced integration time for merchants from 4 weeks to 3 days. Tech stack: Node.js, Express, PostgreSQL, Stripe, Redis.
Patient Data API for Telehealth Platform
Developed a HIPAA-compliant GraphQL API for patient records, appointments, and video calls. Integrated with Twilio for video and Epic EHR for data exchange. Reduced manual data entry by 12 hours per week per clinic. Tech stack: Apollo Server, TypeScript, MongoDB, Twilio, AWS.
Order Fulfillment API for Ecommerce Brand
Created a gRPC-based order processing API connecting Shopify, ShipStation, and warehouse inventory system. Cut order-to-ship time from 6 hours to 15 minutes. Handles 50,000 orders per day. Tech stack: Go, gRPC, Protobuf, Kafka, Shopify API.
Real-time Analytics API for SaaS Platform
Built a WebSocket API streaming user events to a live dashboard. Supports 100,000 concurrent connections with sub-100ms latency. Increased customer retention by 20% due to real-time insights. Tech stack: Node.js, Socket.IO, Redis, TimescaleDB, AWS.
Property Listing API for Real Estate MLS
Developed a REST API aggregating listings from 20+ MLS feeds. Standardized data into a single schema with geocoding and image processing. Reduced listing update time from hours to minutes. Tech stack: Python, FastAPI, PostgreSQL, Elasticsearch, Mapbox.
Learning Management API for EdTech Platform
Built a FERPA-compliant GraphQL API for course content, student progress, and assessments. Integrated with Canvas LMS and Stripe for payments. Scaled to 500,000 active users in 6 months. Tech stack: Node.js, Apollo, PostgreSQL, Redis, AWS.
Why teams hire us.
Fixed Price, No Surprises
We give you a fixed quote after the 2-week Roadmap phase. No hourly billing, no scope creep charges. 98% of our projects finish on budget.
Senior Engineers Only
Every API is built by a senior engineer with 8+ years of experience. No junior developers. Our team averages 12 years in software development.
Compliance Ready
We build APIs that pass HIPAA, PCI-DSS, SOC 2, and FERPA audits. We include encryption at rest and in transit, access controls, and audit logs.
Full Documentation Included
Every API ships with OpenAPI/Swagger docs, a Postman collection, and a deployment runbook. Your team can start using the API the same day we deploy.
Own Your Code
You own 100% of the source code, documentation, and IP. No licenses, no royalties, no vendor lock-in. We transfer everything to your GitHub.
Post-Launch Support
We provide 30 days of bug fixes after launch. Optional maintenance contracts available for ongoing updates, monitoring, and scaling.
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.