Experienced Custom API Development DevelopersAPI Development
We build secure, scalable APIs for web and mobile apps. Get a fixed price quote in 2 weeks.
IRPR hires only senior engineers with 8+ years of experience. We build custom APIs using Node.js, Python, Go, or .NET Core. Every API includes OpenAPI documentation, automated tests, and rate limiting from day one.
An MVP API ships in 12-14 weeks at a fixed price of $80K to $250K. We handle compliance for HIPAA, PCI-DSS, and SOC 2. You get full code ownership and a CI/CD pipeline on GitHub Actions.
CTOs hire us when their in-house team lacks API security expertise. Startup founders hire us to build the backend for their MVP. Enterprise architects hire us to replace legacy SOAP APIs with modern REST or GraphQL services.
Types of software we ship.
REST API development
Build stateless RESTful APIs with JSON responses. Uses Express.js, Fastify, or Django REST Framework.
GraphQL API development
Single endpoint with efficient querying. Uses Apollo Server, GraphQL Yoga, or Hasura for real-time data.
WebSocket API development
Real-time bidirectional communication for chat, live dashboards, and gaming. Uses Socket.IO or ws library.
Third-party API integration
Connect your system to Stripe, Salesforce, HubSpot, Twilio, or any REST/SOAP endpoint. Includes retry logic and error handling.
Microservices API architecture
Decouple your monolith into independent services with gRPC or message queues. Uses Docker, Kubernetes, and RabbitMQ.
API gateway development
Centralized routing, authentication, and rate limiting. Uses Kong, AWS API Gateway, or NGINX Plus.
Internal API development
Private APIs for internal tools and data pipelines. Supports OAuth2, JWT, and role-based access control.
API migration and modernization
Move from legacy SOAP to REST or GraphQL. Includes backward compatibility and phased rollout strategy.
We build for every business type.
Fintech & Banking
Healthcare & Life Sciences
Ecommerce & Retail
SaaS & B2B Platforms
Media & Content
Why Experienced Custom API Development Developers Matter
A poorly designed API costs 10x more to fix after launch than during development.
IRPR's senior engineers design APIs with versioning, pagination, and error handling from the start. We use OpenAPI 3.0 specs so your frontend and mobile teams can work in parallel. Every endpoint includes input validation and rate limiting to prevent abuse.
We have shipped over 200 products across 50 countries. Our APIs handle 10,000+ requests per second with 99.9% uptime. We use automated load testing with k6 and monitor with Datadog to catch issues before they reach production.
Experienced Custom API Development Developers vs Generic Dev Shops
Not all developers build APIs the same way.
Generic dev shops assign junior developers who copy-paste code from Stack Overflow. They skip documentation, ignore rate limiting, and deliver APIs that break under load. You end up paying for rewrites within 6 months.
IRPR assigns a lead architect with 10+ years of experience. Every API ships with automated tests, OpenAPI docs, and a monitoring dashboard. We guarantee 99.9% uptime and include a 30-day post-launch support period.
- Junior developers with 1-2 years experience
- No API documentation
- No rate limiting or input validation
- No load testing before launch
- Hourly billing with no cap
- Code owned by the agency
- Senior engineers with 8+ years experience
- OpenAPI 3.0 docs included
- Rate limiting, JWT auth, and input validation
- Load testing with k6 before production
- Fixed price from $80K
- Full code ownership transferred to you
Our Process for Custom API Development
We follow a 4-phase process that starts with a roadmap and ends with a production-ready API.
Phase 1 (Idea) takes 1 week. We review your requirements, existing systems, and compliance needs. You get a scope document with endpoint list and data model.
Phase 2 (Roadmap) takes 1 week. We deliver a fixed price quote, a 12-week timeline, and a tech stack recommendation. No surprises.
What Ships with Every Custom API
Every project includes these deliverables by default.
You get a production-ready API with everything needed to maintain and scale it. No hidden costs, no missing pieces.
- Source code in your GitHub or GitLab repo
- OpenAPI 3.0 specification file
- CI/CD pipeline on GitHub Actions or GitLab CI
- Automated unit and integration tests (80%+ coverage)
- Rate limiting and JWT authentication
- Error logging with Sentry
- API monitoring dashboard with Datadog
- Deployment scripts for AWS, GCP, or Azure
- Postman collection for manual testing
- 30-day post-launch support and bug fixes
What we ship in this practice.
Payment Gateway API for a Fintech Startup
Built a REST API that processes 50,000 transactions per month. Integrated with Stripe and Plaid. Reduced payment failures by 15% using idempotency keys. Tech stack: Node.js, PostgreSQL, Redis, Stripe API.
EHR Integration API for a Telehealth Platform
Developed a FHIR-compliant API that syncs patient data with Epic and Cerner. Handles 10,000 patient records daily. Reduced manual data entry by 12 hours per week. Tech stack: Python, FastAPI, FHIR, AWS RDS.
Product Catalog API for an Ecommerce Brand
Created a GraphQL API that serves product data to web and mobile apps. Supports 100,000 SKUs with real-time inventory updates. Improved page load times by 40%. Tech stack: Apollo Server, MongoDB, Redis, Stripe.
WebSocket API for a Real-Time Collaboration Tool
Built a WebSocket server that supports 5,000 concurrent users with sub-100ms latency. Used for live document editing and chat. Tech stack: Node.js, Socket.IO, Redis, AWS ECS.
MLS Integration API for a Real Estate Platform
Developed a REST API that aggregates MLS listings from 50+ sources. Normalizes data into a unified schema. Reduced listing update time from 4 hours to 15 minutes. Tech stack: Python, Django, PostgreSQL, Celery.
Student Data API for an EdTech Platform
Built a FERPA-compliant API that manages 100,000 student records. Integrates with Canvas and Blackboard. Reduced data sync errors by 90%. Tech stack: Node.js, Express, MongoDB, AWS Lambda.
Why teams hire us.
Senior engineers only
Every developer on your project has 8+ years of experience. No junior developers, no apprentices. Our lead architect reviews every pull request.
Fixed price from $80K
You get a fixed price quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices. The price covers the full API build including documentation and deployment.
12-week delivery
A production-ready API ships in 12-14 weeks. We deliver working endpoints every Friday for review. No long waits for a first demo.
Full code ownership
You own all source code, documentation, and deployment scripts. No licensing fees, no lock-in. The code is in your repository from day one.
Compliance built in
We build APIs that pass HIPAA, PCI-DSS, and SOC 2 audits. Encryption at rest, encryption in transit, and access logs are included by default.
99.9% uptime guarantee
Every API includes automated monitoring with Datadog and alerting with PagerDuty. We guarantee 99.9% uptime in the post-launch period.
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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