Top Custom API Development VendorAPI Development
We build production-grade APIs that connect your systems and scale to millions of requests. 8-12 week delivery, fixed price, full ownership.
IRPR is a top custom API development vendor. We design and build REST, GraphQL, and gRPC APIs using Node.js, Go, Python, and .NET. Every API includes automated testing, rate limiting, and full OpenAPI documentation.
We ship a production-ready API in 8-12 weeks. Pricing is fixed from $80K to $250K depending on complexity. Our APIs pass HIPAA, PCI-DSS, and SOC 2 audits. We handle auth, logging, monitoring, and CI/CD out of the box.
Companies hire us when they need a reliable API partner. CTOs at SaaS startups need to launch a public API in 10 weeks. Engineering leads at healthcare firms need a HIPAA-compliant FHIR API. Product managers at fintech companies need a PCI-certified payment gateway API.
Types of software we ship.
REST API development
Build stateless RESTful APIs with Express.js or FastAPI. Includes JWT auth, pagination, and Swagger docs.
GraphQL API development
Create flexible GraphQL APIs with Apollo Server or Hasura. Supports subscriptions, batching, and schema stitching.
gRPC API development
High-performance gRPC APIs using Protocol Buffers. Ideal for microservices and real-time streaming with Go or C++.
Webhook system development
Build event-driven webhook systems with retry logic, signature verification, and delivery logs using Redis or RabbitMQ.
Third-party API integration
Connect your app to Stripe, Salesforce, HubSpot, or Slack. Includes error handling, rate limiting, and data sync.
Internal API platform
Design an internal API gateway for your microservices. Includes service discovery, load balancing, and centralized logging.
Public API product
Launch a developer-facing public API with API keys, usage tiers, and a developer portal. Includes Stripe billing integration.
Data API for analytics
Build a read-optimized API for dashboards and reporting. Uses PostgreSQL materialized views, Redis caching, and Elasticsearch.
We build for every business type.
SaaS and technology
Healthcare and life sciences
Fintech and payments
Ecommerce and retail
Media and content
Why IRPR is the top custom API development vendor
We have shipped over 200 APIs for clients in 50+ countries. Every API is built by senior engineers, tested for production, and delivered on time.
Our APIs handle millions of requests per day. We use Node.js, Go, and Python for backend logic. PostgreSQL and Redis for data. Docker and Kubernetes for deployment. Every API gets automated CI/CD with GitHub Actions, Sentry error tracking, and Datadog monitoring.
We work with compliance-heavy industries. Healthcare APIs pass HIPAA audits. Fintech APIs pass PCI-DSS and SOC 2. Ecommerce APIs handle PCI Level 1 data. We document every endpoint and provide Postman collections and integration tests.
The difference between IRPR and generic dev shops
Most agencies deliver an API that works once. IRPR delivers an API that works for years.
Generic dev shops use junior developers and hourly billing. They skip documentation and monitoring. Their APIs break under load and have no security review. You pay for every change, and the code is often a mess.
IRPR uses senior engineers only. We fix the price in week 2. Every API gets OpenAPI docs, rate limiting, auth, logging, and monitoring. We include a 30-day warranty after launch. You own the code and the infrastructure.
- Junior developers on hourly billing
- No API documentation generated
- No rate limiting or auth built in
- No monitoring or alerting setup
- Code ownership unclear
- Scope creep with no change control
- Senior engineers, fixed price from week 2
- OpenAPI 3.0 docs auto-generated
- JWT auth, rate limiting, CORS built in
- Sentry + Datadog monitoring included
- Full code ownership, delivered to your repo
- Scope locked in Roadmap phase, no surprises
How we build your custom API in 4 phases
Our process is the same for every API. It is predictable, transparent, and fast.
We start with a 2-week Roadmap phase where we define endpoints, data models, auth flow, and deployment plan. You get a fixed price and a 12-week timeline. No guesswork.
Then we build the API in 2-week sprints. You see working endpoints every sprint. We deploy to staging, run load tests, and fix issues before launch. The final release includes production deployment and a 30-day warranty.
What ships with every custom API
Every API we build comes with a standard set of production-ready tools and documentation.
You get the source code in your private GitHub repo, plus CI/CD pipelines, monitoring, and error tracking. No extra cost. No hidden fees.
We also include integration tests, load test scripts, and a Postman collection. Your team can start using the API on day one of launch.
- Source code in your private GitHub repo
- OpenAPI 3.0 documentation (Swagger UI)
- CI/CD pipeline with GitHub Actions
- Dockerized deployment with docker-compose
- Sentry error tracking and alerts
- Datadog monitoring dashboard
- Postman collection with examples
- Load test scripts using k6
- Integration tests with Jest or pytest
- 30-day warranty for production issues
What we ship in this practice.
Healthcare FHIR API for a telemedicine startup
Built a HIPAA-compliant FHIR API using Node.js and PostgreSQL. Reduced patient data access time from 5 seconds to 200ms. Handles 50,000 requests per day.
Payment gateway API for a fintech company
Developed a PCI-DSS Level 1 compliant payment API with Stripe Connect. Processed $2M in transactions in the first month. 99.99% uptime.
Inventory API for an ecommerce marketplace
Created a real-time inventory API using GraphQL and Redis. Syncs inventory across 3 warehouses. Reduced overselling by 95%.
Public API for a SaaS analytics platform
Launched a public REST API with API key management and usage tiers. Onboarded 50 developer partners in 3 months. $10K MRR from API subscriptions.
MLS data API for a real estate platform
Built a data API aggregating MLS listings from 5 sources. Uses Python, PostgreSQL, and Elasticsearch. Reduced data refresh time from 24 hours to 15 minutes.
Student data API for an edtech platform
Developed a FERPA-compliant API for student records and grade data. Used .NET and Azure SQL. Integrated with Canvas and Blackboard. Serves 100,000 students.
Why teams hire us.
Senior engineers only, no juniors
Every engineer on your project has 8+ years of experience. We do not use junior developers or offshore teams. Your API is built by people who have done it before.
Fixed price from week 2
After the Roadmap phase, you get a fixed price for the entire project. No hourly billing. No surprise invoices. If scope changes, we agree on a new fixed price.
Full code ownership
You own every line of code we write. The source code is delivered to your GitHub repo. You can deploy it anywhere, anytime. No licensing fees.
Production-ready from day one
Every API ships with monitoring, error tracking, CI/CD, and documentation. You do not need to hire a DevOps team after launch. It is ready for production.
Compliance built in, not bolted on
We design APIs for HIPAA, PCI-DSS, SOC 2, and FERPA from the start. Auth, encryption, audit logs, and access controls are part of the architecture, not an afterthought.
30-day warranty after launch
If something breaks in the first 30 days, we fix it at no cost. We monitor the API, respond to alerts, and deploy patches. No retainer required.
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.