Top API Development AgencyAPI Development
We build custom APIs for Fintech, Healthcare, and SaaS. Fixed price, senior engineers only, delivery in 8-12 weeks.
IRPR is a top API development agency. We build REST APIs, GraphQL APIs, and WebSocket APIs using Node.js, Python, Go, and TypeScript. Every API ships with OpenAPI documentation, automated tests, and a CI/CD pipeline.
We deliver a production-ready API in 8-12 weeks. Fixed pricing starts at $80K for a core API with 10-15 endpoints. All projects include load testing, error monitoring (Sentry), and deployment on AWS or GCP. We comply with HIPAA, PCI-DSS, SOC 2, and GDPR.
Founders hire us when they need a secure, scalable API for their MVP. CTOs hire us to replace a slow legacy API with a modern GraphQL layer. Product teams hire us to integrate Stripe, Salesforce, or Twilio into their existing stack. Compliance officers hire us to build PCI-compliant payment APIs.
Types of software we ship.
REST API Development
Build stateless REST APIs with Node.js or Python. Includes OpenAPI spec, rate limiting, and JWT auth. Deployed on AWS Lambda or ECS.
GraphQL API Development
Create a single GraphQL endpoint that replaces multiple REST endpoints. Uses Apollo Server, DataLoader, and Redis caching.
Payment API Integration
Integrate Stripe, Braintree, or Adyen into your app. Handles webhooks, idempotency, and PCI-DSS compliance. Ships with test suite.
Third-Party API Integration
Connect your app to Salesforce, HubSpot, QuickBooks, or Slack. Includes OAuth2 flow, error handling, and retry logic.
Real-Time API (WebSocket)
Build a WebSocket API for live notifications, chat, or streaming data. Uses Socket.IO or AWS API Gateway WebSockets.
Internal Microservice API
Design internal REST or gRPC APIs for microservice communication. Includes service discovery, circuit breakers, and distributed tracing.
Public API / Developer Portal
Launch a public API with developer documentation, API keys, rate limiting, and usage analytics. Built with Stoplight or Redoc.
Data API (ETL / Analytics)
Build a read-only API on top of your data warehouse (Snowflake, BigQuery). Supports pagination, filtering, and CSV export.
We build for every business type.
Fintech
Healthcare
SaaS
Ecommerce
Real Estate
Why IRPR is a Top API Development Agency
We have shipped 200+ APIs across 50+ countries. Our APIs handle millions of requests per day with 99.9% uptime.
Every API we build is designed for production from day one. We use load testing tools like k6 and Artillery to verify performance before launch. We set up Sentry error tracking, CloudWatch monitoring, and PagerDuty alerts.
Our clients include a fintech that processes $2M in monthly payments through our payment API, a healthcare platform that syncs patient data with 20 EHR systems, and a SaaS company that reduced API response time by 60% after moving from REST to GraphQL.
How We Differ from Other API Agencies
Most agencies bill by the hour and deliver late. We fix both problems.
Generic dev shops start coding without a clear spec. They use hourly billing, so scope creep benefits them. They skip load testing and monitoring. You end up with a slow, fragile API that breaks in production.
IRPR does the opposite. We write a detailed Roadmap in week 2 with every endpoint, data model, and integration. You get a fixed price. We build the API in 8-12 weeks with full test coverage, CI/CD, and monitoring from day one.
- Hourly billing with no cap
- No written specification
- No load testing
- No error monitoring
- No CI/CD pipeline
- Code ownership unclear
- Fixed price from Roadmap phase
- Detailed Roadmap with every endpoint
- Load testing with k6 before launch
- Sentry error tracking on day one
- CI/CD pipeline on GitHub Actions
- Full code ownership transferred to you
Our API Development Process
We follow a 4-phase process that de-risks your API project from idea to production.
Phase 1: Idea. We review your requirements, existing systems, and target users. We produce a 2-page project brief with scope, timeline, and budget estimate. This phase takes 1 week and costs $2,500.
Phase 2: Roadmap. We write a detailed technical specification: every endpoint, data model, integration, auth flow, and deployment plan. You approve the Roadmap before any coding starts. This phase takes 1 week and costs $5,000 (credited toward the build).
What Ships with Your API
You get more than just code. Every API project includes these deliverables by default.
We don't just throw code over the wall. Every deliverable is documented, tested, and ready for your team to maintain. You get the source code in your own GitHub repository from day one.
- Source code in your GitHub repository
- OpenAPI / Swagger documentation
- Automated test suite (unit + integration)
- CI/CD pipeline on GitHub Actions
- Docker Compose for local development
- Deployment scripts for AWS or GCP
- Sentry error tracking configured
- Load test report from k6
- Postman collection for all endpoints
- API key management system
What we ship in this practice.
Payment Processing API
Built a PCI-DSS compliant payment API for a fintech startup. The API processes $2M in monthly transactions through Stripe Connect. Reduced manual reconciliation from 20 hours to 2 hours per week. Tech stack: Node.js, PostgreSQL, Stripe, AWS ECS.
EHR Integration API
Created a HIPAA-compliant API that syncs patient data between a telehealth platform and 20 EHR systems (Epic, Cerner, Athenahealth). Handles 50,000 patient records per day. Tech stack: Python, FHIR, Redis, AWS Lambda.
Subscription Billing API
Built a GraphQL billing API for a SaaS company that manages 10,000 active subscriptions. Integrated with Stripe Billing and Zuora. Reduced billing errors by 95%. Tech stack: TypeScript, Apollo Server, MongoDB, Stripe.
MLS Property Data API
Developed an API that aggregates property listings from 5 MLS sources into a single REST endpoint. Serves 1 million property records to a real estate platform. Tech stack: Node.js, PostgreSQL, Redis, AWS API Gateway.
Inventory Sync API
Built a real-time inventory API for an ecommerce brand with 3 warehouses. Syncs stock levels across Shopify, Amazon, and their own store. Reduced overselling by 100%. Tech stack: Python, WebSocket, Redis, AWS ECS.
Learning Management API
Created a FERPA-compliant API for an edtech company that serves 500 schools. Manages student records, course enrollments, and grade submissions. Tech stack: Ruby on Rails, GraphQL, PostgreSQL, Heroku.
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. The price you see is the price you pay.
Senior engineers only
Every IRPR engineer has 8+ years of experience. We don't use junior or offshore talent. Your API is built by a senior developer who has shipped 10+ production APIs before.
Production-ready from day one
Your API ships with load testing, error monitoring, CI/CD, and documentation. We don't deliver a prototype. We deliver a production system that can handle real traffic.
Full code ownership
You own every line of code from the first commit. We put the source code in your GitHub repository on day one. There is no license fee, no vendor lock-in, no recurring royalty.
Compliance built in
We build HIPAA-compliant APIs with BAA agreements, PCI-DSS compliant payment APIs with tokenization, and SOC 2 compliant APIs with audit logs. Compliance is not an afterthought.
8-12 week delivery
We deliver a production-ready API in 8-12 weeks. Our process is optimized for speed without sacrificing quality. 98% of our projects ship on time.
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.