Professional Custom API Development FirmAPI Development
We build production-grade REST and GraphQL APIs for SaaS, fintech, and healthcare. 8-12 week delivery with a fixed price and full code ownership.
IRPR is a professional custom API development firm that builds secure, scalable APIs for businesses that need reliable data exchange. We use Node.js, Python, Go, Postgres, and Redis to design REST and GraphQL endpoints that handle millions of requests per day.
Every project ships in 8-12 weeks with a fixed price between $80K and $250K. We handle compliance for HIPAA, PCI-DSS, and SOC 2. Our APIs include automated testing with Postman and Jest, plus monitoring with Datadog and Sentry.
We work with CTOs who need a secure payment API for a fintech startup, engineering leads integrating a third-party CRM via REST, and product managers building a custom data pipeline for a healthcare platform. Each client gets a dedicated senior engineer and a clear roadmap.
Types of software we ship.
REST API development
Stateless endpoints with JSON responses, built with Express.js or Fastify. Includes Swagger docs and rate limiting.
GraphQL API development
Flexible query language for complex data needs. Uses Apollo Server, resolvers, and DataLoader for N+1 prevention.
Payment API integration
PCI-DSS compliant endpoints for Stripe, Braintree, or Adyen. Handles webhooks, refunds, and subscription management.
Third-party API integration
Connects your system to Salesforce, HubSpot, or Shopify. Uses OAuth 2.0, retry logic, and idempotency keys.
Internal microservice API
Lightweight gRPC or RabbitMQ endpoints for service-to-service communication. Includes circuit breakers and health checks.
Data ingestion API
High-throughput endpoints for streaming data from IoT devices or logs. Uses Kafka, Redis streams, and batch processing.
Machine learning API
REST endpoints that serve models from TensorFlow or PyTorch. Includes request validation and caching with Redis.
Real-time API (WebSocket)
Low-latency WebSocket connections for chat, live updates, or gaming. Uses Socket.io or uWebSockets with Redis pub/sub.
We build for every business type.
Fintech
Healthcare
Ecommerce
SaaS
Logistics and Manufacturing
Why hire a professional custom API development firm
Building a production API in-house takes months and often fails on security and scalability.
IRPR has shipped over 200 APIs for clients in 50 countries. Our APIs handle up to 10,000 requests per second with 99.9% uptime. We use automated load testing with k6 and Artillery to validate performance before launch.
Every API we build includes rate limiting, authentication via JWT or OAuth 2.0, and structured logging with Elasticsearch. We ship a Postman collection and OpenAPI spec so your team can start integrating immediately.
Generic dev shop vs IRPR: the API development difference
Most dev shops skip security hardening and documentation. IRPR treats your API as a product.
A generic dev shop might throw together a few endpoints with no error handling or monitoring. They use hourly billing and often deliver late. You get a zip file with no CI/CD pipeline or deployment guide.
IRPR delivers a production-ready API with automated tests, a CI/CD pipeline on GitHub Actions, and deployment to AWS ECS or Google Cloud Run. You get a fixed price and a 12-week timeline.
- No rate limiting or auth
- Hourly billing with no cap
- No documentation or Postman collection
- No CI/CD or monitoring
- Delivers 4-6 months late
- No compliance review
- JWT/OAuth 2.0 + rate limiting built in
- Fixed price from $80K to $250K
- OpenAPI spec + Postman collection shipped
- CI/CD on GitHub Actions + Datadog monitoring
- 8-12 week delivery, 98% on-time
- HIPAA, PCI-DSS, SOC 2 compliance checked
Our 4-phase API development process
Every project follows a structured path from idea to production.
We start with a roadmap phase where we map out every endpoint, data model, and integration point. This takes 1-2 weeks and costs a fixed fee of $5K-$10K.
After you approve the roadmap, we build the API in 6-10 weeks. We do weekly demos and deploy to a staging environment after each sprint. The final release includes a deployment guide and a 30-day support window.
What ships with every custom API
You get more than just endpoints. Every project includes a complete delivery package.
Our delivery package is designed so your team can maintain and extend the API without us. We ship everything in your own GitHub repository with full commit history.
All code is written in TypeScript or Go with strict linting rules. We include a Dockerfile and docker-compose file so you can run the API locally in one command.
- Source code in your GitHub repo
- CI/CD pipeline with GitHub Actions
- Postman collection with all endpoints
- OpenAPI 3.0 specification
- Unit and integration tests (90%+ coverage)
- Dockerfile and docker-compose setup
- Datadog or Sentry error tracking
- Rate limiting and JWT auth middleware
- Deployment guide for AWS or GCP
- 30-day post-launch support
What we ship in this practice.
Fintech payment processing API
Built a PCI-DSS compliant payment API for a lending platform. Handles 5,000 transactions per minute with idempotency keys and webhook retries. Tech stack: Node.js, Postgres, Stripe, Redis.
Healthcare EHR integration API
Developed a HIPAA-compliant REST API to sync patient records between a clinic and a lab. Reduced data entry errors by 95%. Tech stack: Python, FastAPI, FHIR, AWS RDS.
Ecommerce inventory sync API
Created a GraphQL API that syncs inventory across Shopify, Amazon, and a warehouse system. Cut manual reconciliation from 10 hours/week to 30 minutes. Tech stack: Ruby on Rails, PostgreSQL, Shopify API.
SaaS billing and metering API
Built a usage-based billing API for a SaaS platform. Tracks API calls, storage, and seats per customer. Reduced billing errors by 99%. Tech stack: Go, TimescaleDB, Stripe.
Logistics real-time tracking API
Developed a WebSocket API for a delivery company to track 1,000 drivers in real time. Reduced customer support calls by 40%. Tech stack: Node.js, Socket.io, Redis, Google Maps API.
Manufacturing IoT data ingestion API
Built a high-throughput REST API for a factory to ingest sensor data from 500 machines. Processed 1 million data points per day with 99.9% uptime. Tech stack: Python, Kafka, InfluxDB, AWS Lambda.
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. Our average API project costs $80K-$250K.
Senior engineers only
We assign a lead engineer with 8+ years of experience to your project. No junior devs, no offshore teams. Our engineers have built APIs for companies like Stripe and Netflix.
8-12 week delivery
We ship production-ready APIs in 8-12 weeks. Our record is 6 weeks for a payment API with 20 endpoints. We use 2-week sprints with weekly demos.
Full code ownership
You own 100% of the source code, documentation, and deployment scripts. We never use proprietary frameworks or license restrictions. Your code lives in your GitHub repo.
Compliance built in
We build HIPAA, PCI-DSS, and SOC 2 compliance into every API. Our APIs include audit logs, encryption at rest and in transit, and role-based access control.
Post-launch support
Every project includes 30 days of post-launch support. We fix bugs, answer questions, and help your team deploy updates. Extended support contracts are available at $5K/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.