Experienced Custom API Development ServicesAPI Development
We build custom APIs that connect your systems and scale to millions of requests. 200+ shipped, 12-week delivery, fixed pricing.
IRPR builds custom APIs using Node.js, Python, Go, GraphQL, REST, and event-driven architectures. We integrate with databases (PostgreSQL, MongoDB), third-party services, and legacy systems to create seamless data flows.
We ship end-to-end API development including design, implementation, documentation, and deployment. Timeline is 8-12 weeks for MVP, with fixed pricing from $80K to $250K. All projects meet compliance standards like HIPAA, PCI-DSS, and SOC 2.
Our buyers are CTOs launching microservices for SaaS platforms, product managers integrating payment gateways, healthcare data officers needing HIPAA-compliant FHIR APIs, and fintech founders requiring PCI-DSS certified endpoints.
Types of software we ship.
REST API Development
Build stateless REST APIs with OpenAPI specs, JWT auth, and rate limiting. Integrates with any frontend or mobile app.
GraphQL API Development
Design GraphQL schemas with Apollo or Relay. Enables efficient data fetching for React, Vue, and mobile clients.
Webhook Integration API
Create real-time webhook endpoints for event-driven systems. Integrates with Stripe, Shopify, Slack, and custom backends.
Payment Gateway API
Build PCI-DSS compliant payment APIs using Stripe, Braintree, or Adyen. Supports subscriptions, invoices, and fraud detection.
Third-Party API Integration
Connect your platform to 50+ third-party APIs like Salesforce, HubSpot, QuickBooks, and AWS. Automated sync and error handling.
Microservices API Gateway
Deploy an API gateway with Kong or NGINX for routing, authentication, and rate limiting across microservices.
Real-Time API with WebSockets
Implement WebSocket APIs for live updates using Socket.io or AWS API Gateway WebSockets. Ideal for chat, dashboards, and notifications.
Public API for SaaS Products
Launch a public API with developer portal, API keys, usage analytics, and documentation. Increase platform stickiness and integrations.
We build for every business type.
SaaS platforms
Healthcare providers
Fintech startups
Ecommerce brands
Logistics and supply chain
Why custom API development matters for your business
Off-the-shelf APIs force your workflows to fit their mold. Custom APIs give you full control over data, speed, and security.
A custom API lets you decide exactly how data flows between your internal systems, third-party tools, and customer-facing apps. You choose the authentication model (OAuth2, JWT, API keys), the data format (JSON, XML, Protobuf), and the performance guarantees (latency under 50ms).
IRPR has built APIs that handle 10,000 requests per second for a Fintech client and process 2 million patient records daily for a Healthcare platform. Every API comes with automated monitoring, error logging, and a 99.9% uptime SLA.
Generic dev shops vs. IRPR: The real difference in API development
Most agencies treat APIs as an afterthought. IRPR builds them as the core product.
Many development shops promise custom APIs but deliver copy-pasted code with minimal documentation. They use hourly billing that punishes efficiency and often leave you with broken integrations and no security review.
IRPR treats every API as a long-term asset. We design for scalability from day one, include full documentation (OpenAPI or GraphQL schema), and run security audits on all endpoints. You own the code and can deploy it anywhere.
- Uses hourly billing with no fixed price
- Delivers minimal or no documentation
- Ignores security best practices (no OWASP review)
- Uses outdated stacks (SOAP, XML-RPC)
- No monitoring or alerting after handoff
- Code ownership often unclear
- Fixed price agreed in Roadmap phase (week 2)
- Full API documentation (OpenAPI 3.0 / GraphQL schema)
- Security audit with OWASP Top 10 compliance
- Modern stacks: Node.js, Go, Python, GraphQL, event-driven
- Built-in monitoring with Sentry and Datadog
- You own 100% of the source code
How we build your custom API: Our 4-phase process
From idea to deployed API in 12 weeks or less. Each phase has a clear deliverable and a fixed cost.
Every API project starts with a 2-week Roadmap phase where we define endpoints, data models, authentication flows, and integrations. You get a detailed specification and a fixed price for the entire build.
The Build phase takes 8-10 weeks with weekly demo sprints. We deploy to staging, run load tests, and deliver a production-ready API with full documentation and CI/CD pipelines.
What ships with every custom API project
You don't just get code. You get a complete, production-ready API system.
Every project includes everything needed to run, maintain, and scale the API. No hidden costs for documentation, monitoring, or security reviews.
All deliverables are checked against a checklist we've refined over 200+ projects. You can verify each item before final acceptance.
- Source code in your private GitHub repository
- CI/CD pipeline on GitHub Actions
- Sentry error tracking integrated
- Datadog or equivalent monitoring dashboard
- OpenAPI 3.0 spec or GraphQL schema
- Postman collection with example requests
- API architecture diagram (draw.io / Lucidchart)
- Load test results (k6 or Artillery)
- Security audit report (OWASP Top 10)
- Deployment guide and runbook
What we ship in this practice.
Payment Processing API for Fintech Startup
Built a REST API that handles 5,000 payment transactions per minute with retry logic and idempotency keys. Reduced payment failures by 40%. Tech stack: Node.js, Stripe, PostgreSQL, Redis.
FHIR Patient Data Exchange API for Healthcare
Developed a HIPAA-compliant FHIR API that connects 3 hospital EMRs to a patient app. Enabled real-time lab result retrieval and reduced data entry hours by 12 per week. Tech stack: Python, Flask, FHIR R4, AWS HealthLake.
Inventory Sync API for Ecommerce Platform
Created a GraphQL API that syncs inventory across Shopify, Amazon, and a warehouse WMS in real time. Eliminated overselling and saved $200K in lost orders per year. Tech stack: Ruby on Rails, GraphQL, RabbitMQ, PostgreSQL.
Public API for SaaS CRM
Designed and shipped a public REST API with API keys, rate limiting, and usage analytics. Drove 300+ developer integrations in 6 months and increased platform stickiness by 25%. Tech stack: Go, REST, PostgreSQL, Redis, API Gateway (Kong).
Real-Time Tracking API for Logistics
Built a WebSocket API that sends live GPS coordinates from delivery trucks to a customer app. Reduced support calls by 60% and improved NPS by 15 points. Tech stack: Node.js, Socket.io, MongoDB, AWS ECS.
Employee Data API for HR Tech
Developed a GraphQL API that aggregates employee data from 5 legacy systems (ADP, BambooHR, Workday) into a single unified profile. Cut integration maintenance time by 20 hours per week. Tech stack: Python, GraphQL, Apollo, PostgreSQL, Kafka.
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
All work is done by senior engineers with an average of 8+ years of experience. No junior developers, no outsourcing, no code monkeys. You talk directly to the engineer building your API.
Full code ownership
You own 100% of the source code, documentation, and architecture artifacts. No licensing fees, no lock-in, no hidden dependencies. Deploy on your own AWS, GCP, or on-premise servers.
12-week delivery guarantee
We ship your MVP API in 12 weeks or less. Our process has delivered 200+ projects on time with a 98% on-time record. If we're late, we discount the remaining phases.
Compliance built in
HIPAA, PCI-DSS, SOC 2, and GDPR compliance are included in every relevant project. We bake security into the design, not bolt it on after. Automated audit logs and encryption at rest and in transit.
Post-launch support included
Every project comes with 4 weeks of post-launch support for bug fixes, minor enhancements, and monitoring. After that, you can extend support monthly or annually at a fixed rate.
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.