Best Custom API Development CompanyAPI Development
We build APIs that scale without the overhead. 200+ projects shipped, 98% on-time, fixed price from day one.
IRPR is a custom API development company that builds production-ready APIs using Node.js, Python, Go, and AWS Lambda. We design every API with OpenAPI specs, rate limiting, and authentication (JWT or OAuth2) from the start.
We ship a fully functional API in 12-14 weeks with fixed pricing between $80K and $250K. Every API meets compliance standards like HIPAA, PCI-DSS, or SOC 2 depending on your industry.
CTOs hire us to build microservices that replace legacy systems. Product managers work with us to launch API-first SaaS platforms. Enterprise architects use us to integrate third-party APIs like Salesforce, Stripe, and Twilio.
Types of software we ship.
REST API
Stateless, resource-oriented APIs using HTTP methods. Built with Express.js or FastAPI. Includes OpenAPI documentation.
GraphQL API
Flexible query language for frontend-driven apps. Uses Apollo Server or Yoga. Reduces over-fetching by up to 60%.
WebSocket API
Real-time, bidirectional communication for chat, live dashboards, and gaming. Built on Socket.IO or AWS API Gateway WebSocket.
gRPC API
High-performance RPC framework using Protocol Buffers. Ideal for internal microservices. 10x faster than REST for high throughput.
SOAP API
XML-based protocol for enterprise integrations. Supports WS-Security and transactional compliance. Used in finance and healthcare.
Event-driven API
Async messaging with Kafka or RabbitMQ. Decouples services for scalability. Handles 100K+ events per second.
Third-party API integration
Connect your app to Stripe, Salesforce, HubSpot, Twilio, or 200+ other APIs. Includes retry logic and caching.
Internal API (B2B)
Private APIs for partner integrations or internal services. Built with API keys, OAuth2, and usage quotas.
We build for every business type.
healthcare
fintech
ecommerce
SaaS
logistics
Why choose the best custom API development company?
We have built over 200 custom APIs for companies in 50 countries.
Every API we build starts with an OpenAPI specification, so you know exactly what endpoints, schemas, and error handling to expect. We include rate limiting, authentication (JWT or OAuth2), and monitoring with Datadog from day one.
Our APIs average 99.9% uptime in production. We use automated CI/CD pipelines with GitHub Actions, and every API ships with unit tests and integration tests covering at least 90% of the codebase.
How we differ from generic dev shops
Most API development companies skip design and documentation. We do the opposite.
Generic shops start coding without an API contract. That leads to inconsistent endpoints, missing error handling, and integration nightmares. They also bill by the hour, so you never know the final cost.
IRPR writes the OpenAPI spec in week 1, gets your approval, then builds exactly that. We give you a fixed price in the Roadmap phase (week 2). No surprises, no scope creep.
- No API contract before coding
- Hourly billing with no cap
- No rate limiting or auth built-in
- No monitoring or alerting
- Code ownership unclear
- No post-launch support
- OpenAPI spec approved in week 1
- Fixed price from Roadmap phase
- JWT/OAuth2 + rate limiting by default
- Datadog monitoring + PagerDuty alerts
- Full source code ownership
- 2 weeks of post-launch support included
Our API development process
We follow a 4-phase process that delivers a production-ready API in 12 weeks.
Each phase has clear deliverables and a sign-off gate. You see progress every week via our project management dashboard.
We use agile sprints with 2-week cycles. Every sprint ends with a demo of working endpoints.
What ships with your custom API
Every API project includes these deliverables by default.
No hidden extras. Everything listed below is included in the fixed price.
You get the source code in your own GitHub repository from day one.
- Source code in your GitHub repo
- OpenAPI/Swagger documentation
- CI/CD pipeline with GitHub Actions
- Unit tests (90%+ coverage)
- Integration tests for all endpoints
- Rate limiting and authentication (JWT/OAuth2)
- Datadog monitoring dashboard
- PagerDuty alerting configuration
- Load test report (e.g., k6 results)
- Deployment guide and runbook
What we ship in this practice.
Real-time payment processing API
Built a PCI-DSS compliant API that processes 500+ transactions per second. Reduced payment failure rate by 25%. Tech stack: Node.js, PostgreSQL, Stripe, AWS Lambda.
HIPAA-compliant patient data API
Created a FHIR API for a telehealth platform. Handles 10K+ patient records with full audit logging. Reduced data entry time by 8 hours per week. Tech stack: Python, FastAPI, MongoDB, AWS HealthLake.
Multi-tenant SaaS API gateway
Designed an API gateway for a B2B SaaS with 200+ tenants. Each tenant gets isolated rate limits and custom authentication. Tech stack: Kong, Go, PostgreSQL, Redis.
Ecommerce inventory sync API
Built a real-time inventory sync API between Shopify and a warehouse management system. Eliminated overselling, saving $50K/month in refunds. Tech stack: Ruby on Rails, RabbitMQ, Shopify API.
Logistics route optimization API
Developed a gRPC API that optimizes delivery routes in real time. Reduced fuel costs by 15% for a fleet of 500 trucks. Tech stack: Go, gRPC, Google Maps API, BigQuery.
Media asset processing API
Created an event-driven API that transcodes video files to 4K, 1080p, and 720p. Handles 1000+ uploads per day with 99.9% uptime. Tech stack: Node.js, AWS S3, FFmpeg, SQS.
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.
Senior engineers only
Our team averages 10+ years of experience. We assign a lead engineer who stays on your project from start to finish.
12-week delivery guarantee
We ship a production-ready API in 12-14 weeks. 98% of our projects finish on time or early.
Full code ownership
You own every line of code. We put the source code in your GitHub repo from day one. No licensing fees.
Compliance built-in
We build APIs that meet HIPAA, PCI-DSS, and SOC 2 standards. Our infrastructure uses AWS with encryption at rest and in transit.
Post-launch support
Every project includes 2 weeks of post-launch support. After that, we offer maintenance retainers starting at $2K/month.
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.