Professional Custom API Development DevelopersCustom API
Build RESTful and GraphQL APIs that scale. We deliver production-ready endpoints in 8-12 weeks with fixed pricing.
IRPR builds production-grade custom APIs for your product. We use Node.js, Python, Go, PostgreSQL, Redis, and message queues like RabbitMQ or Kafka to create REST APIs, GraphQL endpoints, WebSocket servers, and microservices that handle thousands of requests per second.
Your API ships in 8-12 weeks with a fixed price of $80K-$250K. Every project includes comprehensive OpenAPI documentation, automated tests, CI/CD pipelines, and monitoring. We follow GDPR, HIPAA, SOC 2, and PCI-DSS compliance standards as needed.
CTOs who need a secure, scalable backend for their SaaS platform hire us. Product managers who want to launch a mobile app with a reliable API work with us. Startup founders who need an MVP that actually scales trust IRPR to build their core API.
Types of software we ship.
REST API backend
Stateless HTTP endpoints for CRUD operations. Built with Express.js, PostgreSQL, and Redis caching. Supports pagination, filtering, and rate limiting.
GraphQL API gateway
Unified query layer that aggregates multiple data sources. Uses Apollo Server with federation. Reduces client-server round trips by 60%.
Microservices API mesh
Distributed API architecture with service discovery via Consul. Each service uses gRPC for internal calls and REST for external. Managed with Kubernetes.
Real-time API with WebSockets
Persistent two-way connections for live updates. Built with Socket.io or raw WebSockets, Redis Pub/Sub, and horizontal scaling via NGINX.
API integration layer
Middleware that connects your system to third-party services like Stripe, Salesforce, or Slack. Handles OAuth, webhooks, and data transformation.
Mobile app backend API
Optimized for low-bandwidth mobile networks. Uses JSON:API format, offline-first sync (PouchDB + CouchDB), and push notifications with Firebase.
Internal data API
Exposes internal databases and legacy systems via secure, documented endpoints. Includes role-based access control and audit logging with Splunk.
Event-driven streaming API
Processes high-volume events in real time. Uses Apache Kafka or AWS Kinesis, streams to data lakes, and triggers lambda functions for analytics.
We build for every business type.
SaaS products
Fintech
Healthcare
Ecommerce
Enterprise
Why Professional Custom API Development Developers Matter
A poorly designed API costs more in rework and lost customers than getting it right from day one.
IRPR has shipped 200+ APIs across 50 countries. Our APIs power payment systems that process $10M+ monthly, healthcare platforms that handle PHI for 500K patients, and real-time ecommerce backends that serve 100K concurrent users.
Every API we build is designed for failure tolerance and horizontal scaling. We use circuit breakers, retry logic, and idempotency keys to ensure your integration partners never see downtime.
Generic Dev Shop vs Professional Custom API Development Developers
Not every developer team knows how to build APIs that scale, are documented, and stay secure.
Many agencies treat API development as an afterthought. They write code without specs, skip automated testing, and leave you with a black box that breaks when you need to add a new endpoint.
IRPR treats your API as the core product. Every endpoint is documented in OpenAPI before a line of code is written. We use contract-first development with Postman collections and automated integration tests.
- No API design phase before coding
- Hourly billing with no fixed scope
- Outdated REST practices, no versioning
- Minimal or no documentation
- No CI/CD or monitoring
- Code ownership often unclear
- OpenAPI spec created in Roadmap phase (week 2)
- Fixed price: $80K-$250K, no surprises
- REST + GraphQL, versioned from day one
- Full OpenAPI docs + Postman collection shipped
- GitHub Actions CI/CD + Datadog monitoring
- You own all source code and IP
Our Process for Building Your Custom API
From idea to production in 8-12 weeks with clear milestones.
Every API project starts with a 2-week Discovery phase where we map out all endpoints, data models, and integrations. You get a detailed Roadmap document that includes estimated costs and timelines.
Development happens in 2-week sprints with daily standups and weekly demos. We deploy to staging after each sprint so you can test real endpoints as we build.
What Ships with Every Custom API
You get everything you need to maintain and extend your API after launch.
IRPR follows the principle that your team should be able to run with the code from day one. We hand over complete ownership and all supporting infrastructure.
No black boxes. No undocumented endpoints. Your developers can be productive immediately after we hand over the project.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification for every endpoint
- Postman collection with example requests
- CI/CD pipeline using GitHub Actions
- Automated unit and integration tests (90%+ coverage)
- Monitoring dashboards in Datadog
- Error tracking with Sentry
- Docker Compose and Kubernetes deployment manifests
- Security scan report (OWASP top 10)
- Admin documentation and runbook
What we ship in this practice.
Payment Processing API
Built a RESTful payment API for a fintech startup that processes $2M in transactions monthly. Integrated with Stripe and Plaid using idempotency keys. Tech stack: Node.js, Express, PostgreSQL, Redis, Stripe API.
Healthcare Data Exchange API
Created a HIPAA-compliant FHIR API for a telemedicine platform. Allowed clinics to share patient records securely with 99.9% uptime. Reduced onboarding time from 4 weeks to 3 days. Tech stack: Python, FastAPI, PostgreSQL, AWS KMS, Okta.
Real-time Chat API
Developed a WebSocket-based chat API for a social app that supports 50K concurrent users. Messages delivered in under 100ms. Tech stack: Go, WebSockets, Redis Pub/Sub, Nginx, AWS ECS.
Inventory Management API
Built a RESTful API for a retail chain to sync inventory across 200 stores in real time. Eliminated manual reconciliation saving 40 hours per week. Tech stack: Node.js, Express, MongoDB, RabbitMQ, Elasticsearch.
Customer Analytics API
Designed a GraphQL API for a SaaS analytics platform that aggregates data from 15 sources. Queries that took 5 seconds now return in 200ms. Tech stack: Apollo Server, PostgreSQL, Redis, ClickHouse.
Social Media Integration API
Created a middleware API that unifies posting and analytics for Facebook, Instagram, and LinkedIn. Users can publish content across networks from a single endpoint. Tech stack: Node.js, Express, OAuth 2.0, AWS Lambda, DynamoDB.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote during the Roadmap phase (week 2). No hourly billing, no budget overruns. You know the total cost before we write a line of code.
8-12 week delivery
We have shipped 200+ APIs. Our process is optimized for speed. Your first endpoints are ready for testing within 4 weeks, and the complete API is live by week 12 at the latest.
OpenAPI specs for every endpoint
Before development begins, we write the OpenAPI 3.0 specification. This becomes the single source of truth for documentation, testing, and client SDK generation.
Full code ownership
You own all source code, documentation, and IP from day one. No hidden licensing. No restrictions. We transfer the repo and all assets at the end of the project.
Senior engineers only
Our team averages 10+ years of experience building APIs for companies like Google, Amazon, and Stripe. No junior developers. You work directly with the engineers writing your code.
Compliance ready
We have built HIPAA-compliant APIs for healthcare, PCI-DSS for fintech, and SOC 2 for SaaS. If your industry has regulations, we can design your API to meet them.
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.