Top Custom API Development ServicesAPI Development
We build secure, scalable APIs for your app. Get a production-ready API in 12 weeks with fixed pricing.
IRPR builds custom APIs for web and mobile applications. We use Node.js, Python, Go, and .NET Core to design RESTful and GraphQL endpoints with OpenAPI specs.
Most custom API projects ship in 8-12 weeks with a fixed price range of $80K-$250K. We handle compliance for HIPAA, PCI-DSS, and SOC 2 from day one.
Our clients include SaaS startups needing a scalable backend, healthcare platforms requiring HIPAA-compliant data exchange, fintech companies building payment APIs, and ecommerce brands integrating third-party services.
Types of software we ship.
REST API Development
Build stateless RESTful APIs with JSON or XML. Integrate with Stripe, Twilio, or SendGrid for payment, messaging, and email.
GraphQL API Development
Flexible query language APIs for complex data. Use Apollo or Relay with React frontends to reduce over-fetching.
Microservices API Gateway
Create a single entry point for multiple microservices. Handle rate limiting, auth, and routing with Kong or Envoy.
Third-Party API Integration
Connect your app to Salesforce, HubSpot, Shopify, or QuickBooks. Sync data bi-directionally with OAuth 2.0.
Payment API Development
Build secure payment processing with Stripe, Braintree, or Adyen. Tokenize card data with PCI-DSS compliance.
Real-Time API (WebSocket)
Low-latency APIs for live chat, notifications, or IoT data. Use Socket.io or WebSocket over HTTPS.
Internal API for Enterprise
Private APIs for internal systems. Automate workflows between ERP, CRM, and HR tools with RBAC and audit logs.
AI API Integration
Wrap machine learning models in REST endpoints. Deploy OpenAI, GPT-4, or custom models behind a secure API.
We build for every business type.
SaaS and Tech
Healthcare
Fintech and Payments
Ecommerce and Retail
Enterprise and Logistics
Why custom APIs matter for your product
A well-designed API is the backbone of modern software.
Custom APIs let you control data flow, security, and performance. Off-the-shelf integrations often break as you scale. With a tailored API, you can add new features without rewriting the backend.
IRPR has built over 200 APIs for clients in healthcare, fintech, and ecommerce. Our average time to a production-ready API is 12 weeks, and we maintain 99.9% uptime post-launch.
How we build your API differently
Most agencies start coding without a plan. We start with a roadmap.
Generic dev shops rush into development without documenting endpoints or security requirements. They charge hourly and often deliver APIs that don't scale.
IRPR begins with a 2-week Roadmap phase. We write OpenAPI specs, define auth flows, and set up CI/CD before writing a single line of production code. This saves weeks of rework.
- Hourly billing with no cap
- No API documentation upfront
- No CI/CD pipeline
- Vague timeline estimates
- No compliance review
- Code ownership unclear
- Fixed price after 2-week Roadmap
- OpenAPI specs before coding
- GitHub Actions CI/CD from day one
- 8-12 week guaranteed timeline
- HIPAA/PCI/SOC 2 built in
- Full code ownership
Our API development process in 4 phases
From idea to production in 8-12 weeks.
We split every API project into four phases. Each phase has a deliverable you can review and approve.
This structure keeps your budget predictable and your timeline on track.
What you get with every custom API project
No surprises. Everything listed ships by default.
Every API project includes these deliverables. You own all code, documentation, and infrastructure from day one.
- Complete OpenAPI 3.0 specification
- Source code in your private GitHub repo
- CI/CD pipeline using GitHub Actions
- Postman collection for manual testing
- Sentry error tracking and monitoring
- Load test results (k6 or Artillery)
- Deployment to AWS ECS or GCP Cloud Run
- 30-day post-launch support SLA
- Developer documentation (Markdown)
- One-hour video handoff walkthrough
What we ship in this practice.
Payment API for a fintech startup
Built a PCI-compliant payment API using Stripe Connect and Node.js. Reduced chargeback handling time by 60% and processed $2M in transactions in the first month.
Healthcare API for telemedicine platform
Designed a HIPAA-compliant API with FHIR standards using Go and PostgreSQL. Integrated video calls via Twilio and reduced patient wait times by 40%.
Ecommerce API for multi-channel retail
Created a unified API for inventory, orders, and shipping across Shopify, Amazon, and custom warehouse systems. Cut sync errors by 90% and enabled same-day fulfillment.
SaaS API for subscription analytics
Built a GraphQL API using Apollo Server and Python that aggregates usage data from 50+ customers. Enabled real-time dashboards and reduced query latency by 70%.
Real estate API for MLS integration
Developed a REST API that ingests MLS listing data, normalizes it, and serves it to a React frontend. Reduced data refresh time from hours to minutes.
Logistics API for fleet tracking
Built a WebSocket API for real-time GPS tracking of 500+ vehicles. Used MongoDB for geospatial queries and reduced route optimization time by 50%.
Why teams hire us.
Fixed price after Roadmap
We give you a fixed quote for the full API after a 2-week Roadmap phase. No hourly billing, no surprise invoices. Our average API project is $120K-$250K.
Senior engineers only
Every API is built by engineers with 10+ years of experience. We do not outsource or use junior developers. Our team has built APIs for Fortune 500 companies.
Built-in compliance
We build HIPAA, PCI-DSS, and SOC 2 compliance into your API from the start, not as an afterthought. This saves an average of 6 weeks of remediation.
Full code ownership
You own all source code, documentation, and infrastructure. No licensing fees, no lock-in. We hand over GitHub repos and cloud accounts on launch day.
98% on-time delivery
We track every project against a week-by-week timeline. Over 200 products shipped with a 98% on-time rate across 50+ countries.
Post-launch support included
Every API project includes 30 days of monitoring and bug fixes after launch. We use Sentry and Datadog to catch issues before your users do.
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.
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