Expert Custom API Development CompanyAPI Development
We build custom APIs that connect your systems and scale with your data. Fixed price, 8-12 week delivery, senior engineers only.
IRPR is an expert custom API development company. We design and build REST, GraphQL, and gRPC APIs using Node.js, Python, Go, and .NET. Every API includes automated testing, CI/CD pipelines, and full documentation with Swagger or Postman.
We ship production-ready APIs in 8-12 weeks. Pricing is fixed and starts at $80K for a standard integration, ranging up to $250K for complex enterprise systems with multiple endpoints and compliance requirements. We handle HIPAA, PCI-DSS, SOC 2, and ISO 9001 standards.
Our clients are CTOs at SaaS companies needing to expose their platform via API, VP of Engineering at fintech firms requiring PCI-compliant payment APIs, product managers at healthcare startups building FHIR-compliant patient data APIs, and ecommerce directors integrating with 10+ external fulfillment systems.
Types of software we ship.
REST API Development
Stateless, cacheable APIs using OpenAPI 3.0 specs. Ideal for mobile backends and web app integrations.
GraphQL API Development
Single endpoint with flexible queries. Built with Apollo Server or Relay for React and React Native apps.
gRPC API Development
High-performance, language-agnostic APIs using Protocol Buffers. Used for microservices and real-time streaming.
Payment Gateway API Integration
Connect Stripe, Braintree, or Adyen with custom endpoints. PCI-DSS Level 1 compliant.
Third-Party API Integration
Unify Salesforce, HubSpot, Shopify, or QuickBooks data into a single internal API layer.
Internal Microservice API
Event-driven APIs with message queues (RabbitMQ, Kafka) for asynchronous service communication.
Public API Product
Developer-facing APIs with rate limiting, API keys, documentation portal, and usage analytics.
Data Sync API
Bidirectional sync between legacy systems and cloud platforms using webhooks or scheduled batch jobs.
We build for every business type.
SaaS Platforms
Fintech Companies
Healthcare Organizations
Ecommerce Brands
Enterprise IT
Why You Need an Expert Custom API Development Company
A well-built API separates scalable software from brittle integrations.
IRPR has shipped over 200 products across 50 countries. Every custom API we build includes automated load testing, rate limiting, and error handling. We use tools like Postman for documentation and Sentry for monitoring in production.
Our APIs handle millions of requests per day with 99.9% uptime. We enforce OAuth 2.0 or JWT authentication by default. Each project includes a 30-day post-launch support period to monitor and optimize performance.
Generic Dev Shop vs Expert Custom API Development Company
Not all development shops deliver production-grade APIs. Here is the difference.
Generic shops often hand off incomplete code with no documentation or monitoring. You end up with a fragile API that breaks under load and takes months to fix.
IRPR delivers fully documented, tested, and monitored APIs. Every endpoint has a unit test, integration test, and load test. We deploy to AWS or GCP using Terraform and Kubernetes.
- No API documentation
- No automated tests
- No rate limiting
- No monitoring or alerts
- Hourly billing with scope creep
- No compliance support
- Swagger/OpenAPI docs included
- 100% unit + integration test coverage
- Rate limiting and throttling built in
- Sentry + Datadog monitoring
- Fixed price with clear scope
- HIPAA, PCI-DSS, SOC 2 ready
Our Custom API Development Process
We follow a four-phase process to deliver your API on time and on budget.
Every project starts with a two-week Roadmap phase where we define endpoints, data models, authentication, and compliance requirements. You get a fixed quote and a detailed build plan before development begins.
After the Roadmap, we build the API in 8-12 weeks using iterative sprints. Each sprint ends with a deployable increment. You see working endpoints every two weeks.
What Ships with Every Custom API
Every project includes these deliverables by default. No hidden line items.
We believe in full transparency. Every API project ships with complete source code, infrastructure as code, and documentation. You own everything from day one.
Our deliverables are designed to let your team take over immediately. We use the same tools your internal engineers use: GitHub, Docker, and Terraform.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification (Swagger)
- Postman collection with example requests
- CI/CD pipeline on GitHub Actions
- Dockerized local development environment
- Unit tests with 90%+ coverage
- Integration tests for all endpoints
- Load test results from k6 or Artillery
- Monitoring dashboard in Datadog
- 30-day post-launch support period
What we ship in this practice.
Payment Gateway API for Fintech Startup
Built a PCI-DSS compliant payment API that processes 10,000+ transactions per day. Integrated with Stripe and Plaid for bank account verification. Reduced manual reconciliation from 15 hours per week to zero. Tech stack: Node.js, Express, PostgreSQL, Stripe API, Docker.
Patient Data API for Telehealth Platform
Developed a FHIR-compliant API to exchange patient records between EHR systems. Handles 500,000+ patient records with sub-200ms response times. Achieved HIPAA compliance in 10 weeks. Tech stack: Python, FastAPI, HL7 FHIR, AWS RDS, Terraform.
Inventory Sync API for Ecommerce Brand
Created a bidirectional sync API between Shopify and a legacy ERP system. Reduced inventory discrepancies from 12% to 0.5%. Syncs 50,000+ SKUs every 5 minutes. Tech stack: Ruby on Rails, GraphQL, Shopify Admin API, RabbitMQ.
Public API for SaaS Analytics Platform
Designed and built a public REST API that allows customers to programmatically export dashboards and reports. Onboarded 200+ developer teams in the first 3 months. Tech stack: Go, gRPC, PostgreSQL, Redis, Kong API Gateway.
CRM Integration API for Real Estate Firm
Built a custom API that syncs MLS listings with Salesforce CRM. Reduced data entry time by 8 hours per agent per week. Integrated with 12 different MLS providers. Tech stack: Node.js, TypeScript, Salesforce REST API, MongoDB, AWS Lambda.
Student Data API for EdTech Platform
Developed a FERPA-compliant API to integrate with school district SIS systems. Handles 100,000+ student records with role-based access control. Tech stack: .NET Core, C#, Azure SQL, Azure Functions, OAuth 2.0.
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. You know the total cost before we write a single line of code.
Senior engineers only
We do not outsource or use junior developers. Every engineer on your project has 8+ years of experience building APIs. Our team includes former engineers from Google, Amazon, and Stripe.
Compliance built in
We build HIPAA, PCI-DSS, SOC 2, and FERPA compliant APIs from day one. We do not add compliance as an afterthought. Our engineers know the audit requirements for each standard.
Full ownership
You own the complete source code, documentation, and infrastructure after the project. No licensing fees, no vendor lock-in, no recurring payments for the code we write.
8-12 week delivery
We ship production-ready APIs in 8-12 weeks. Our process is designed for speed without cutting corners. 98% of our projects deliver on time.
Post-launch support
Every project includes 30 days of post-launch support with monitoring and bug fixes. We do not disappear after deployment. You get direct access to the engineers who built your API.
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.