Expert Custom API Development VendorCustom API
We build secure, scalable APIs for your product. 200+ API integrations shipped across 50+ countries.
IRPR builds custom APIs that connect your apps, automate workflows, and handle high throughput. We use Node.js, Python, Go, and frameworks like Express, FastAPI, and Apollo for GraphQL.
Each project ships with a complete API specification, auto-generated docs (Swagger/OpenAPI), authentication (JWT/OAuth2), and rate limiting. Timeline: 10-14 weeks. Price range: $80K-$250K. Compliance: HIPAA, PCI-DSS, SOC 2.
CTOs who need to expose legacy data via REST. Product managers launching multi-tenant SaaS platforms. Fintech founders integrating with banking APIs. Health tech teams requiring HIPAA-compliant FHIR endpoints.
Types of software we ship.
REST API Development
Build stateless RESTful APIs with OpenAPI specs. Includes auto-generated docs, versioning, and pagination. Use Express, FastAPI, or ASP.NET Core.
GraphQL API Development
Flexible GraphQL APIs with Apollo or Hasura. Clients query exactly what they need. Built-in caching, subscriptions, and schema stitching.
Microservices API Gateway
Single entry point for multiple microservices. Handles routing, authentication, rate limiting. Use Kong, NGINX, or AWS API Gateway.
Third-Party API Integration
Connect your app to Stripe, Salesforce, HubSpot, or custom endpoints. Handles OAuth, webhooks, retries, and error logging.
Real-Time API WebSocket
WebSocket APIs for live data feeds. Use Socket.IO, WebSocket, or MQTT. Typical for chat, notifications, live dashboards.
Internal API (B2B) Development
APIs for partner integrations with API keys, usage tracking, and SLAs. Includes developer portal and sandbox environments.
API Security & Auth
Implement OAuth2, OpenID Connect, or JWT. Add rate limiting, IP whitelisting, and audit logs. SOC 2 compliant.
API Documentation & Testing
Auto-generate interactive docs with Swagger/OpenAPI. Set up Postman collections, automated tests, and API monitoring.
We build for every business type.
E-Commerce
Fintech
Healthcare
SaaS
Logistics & Supply Chain
Why hire an expert custom API development vendor
IRPR has delivered 200+ custom APIs for startups and enterprises across 50+ countries.
We focus on performance and security from day one. Every API goes through load testing, automated security scans, and code review.
Our clients see an average of 40% reduction in integration time. We use async-first patterns and caching to keep latency under 50ms for 95% of requests.
Expert vendor vs generic offshore team
The difference between a well-architected API and a brittle one is experience.
Generic shops write endpoints that break under load. IRPR designs for scale from the start.
We hand over a fully documented, tested, and monitored API with a clear contract.
- No API design upfront
- Inconsistent error handling
- No rate limiting or auth from the start
- No documentation until the end
- No load testing or performance tuning
- No post-launch monitoring or support
- OpenAPI contract written in week 1
- Consistent JSON responses with detailed error codes
- Rate limiting, JWT/OAuth2, and API keys built in
- Swagger docs auto-generated and updated with code
- Load testing with k6 and performance optimization
- Sentry error tracking, Datadog monitoring, 1-month support included
Our API development process in 4 phases
From idea to production API in 10-14 weeks.
We break every project into clear phases with fixed milestones.
You get a working API by week 6, with full test coverage and documentation.
What you get with every custom API project
Full ownership and transparency from day one.
We ship everything you need to run your API independently.
No black boxes, no vendor lock-in.
- Complete OpenAPI 3.0 specification document
- Source code in your GitHub/GitLab repo
- CI/CD pipeline with GitHub Actions or GitLab CI
- Docker containerized deployment
- Swagger UI hosted on your domain
- Postman collection with environment variables
- Rate limiting, authentication, and input validation
- Automated test suite (unit + integration + load)
- Sentry error tracking and Datadog monitoring
- One month of post-launch support and bug fixes
What we ship in this practice.
Payment Gateway API for Fintech Startup
Built a RESTful API to connect a lending platform with multiple payment processors (Stripe, Plaid, ACH). Reduced payment failure rate by 30% and integrated KYC checks. Tech stack: Node.js, PostgreSQL, Stripe API, AWS Lambda.
EHR Integration API for Health Tech Platform
Developed a FHIR-compliant API to sync patient records between a telemedicine app and Epic EHR. Achieved under 200ms response time for 99% of requests. Tech stack: Python, FastAPI, FHIR, AWS RDS, Okta for auth.
Real-Time Inventory API for E-Commerce
Built a WebSocket API to push live inventory updates across 500+ retail locations. Reduced overselling incidents by 80%. Tech stack: Node.js, Socket.IO, Redis, MongoDB, Azure.
Multi-Tenant API for SaaS Platform
Designed a multi-tenant API with usage-based billing and webhooks for a CRM SaaS. Onboarded 50+ enterprise clients in 3 months. Tech stack: Ruby on Rails, GraphQL, Stripe, PostgreSQL, Docker.
Logistics Tracking API for Shipping Company
Created a unified API to track shipments across FedEx, UPS, and DHL. Cut integration time for new clients by 60%. Tech stack: Go, AWS API Gateway, DynamoDB, Redis.
Media Content API for Streaming Service
Built a RESTful API to manage video metadata, transcoding jobs, and CDN distribution. Handled 10,000+ requests per minute during peak hours. Tech stack: Node.js, Express, MongoDB, AWS Elastic Transcoder, CloudFront.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
Our team consists of architects with 10+ years of API experience. No junior devs, no outsourcing to third parties.
OpenAPI contract before code
We write a detailed API specification before writing a single line of code. You review and approve every endpoint and schema upfront.
12-week delivery guarantee
We deliver a production-ready API in 8-12 weeks. 98% of our projects ship on time or early.
Full ownership and no vendor lock-in
You own all source code, documentation, and credentials from day one. We deploy to your cloud account, not ours.
Compliance-ready from the start
We build HIPAA, PCI-DSS, and SOC 2 compliant APIs. Every project includes security scanning and audit logs.
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.