Senior Custom API Development FirmAPI Development
We build production-grade APIs for your product. Fixed price, 12-week delivery, full code ownership.
IRPR is a senior custom API development firm. We design and build REST, GraphQL, and gRPC APIs for web and mobile products. Every engineer has 10+ years of experience and has shipped production systems at scale.
We deliver a working API in 12 weeks on average. Pricing is fixed from the Roadmap phase (week 2) and ranges from $80K to $250K depending on complexity. We handle compliance for HIPAA, PCI-DSS, SOC 2, and FERPA.
Founders hire us when they need a secure, scalable API for their SaaS product. CTOs hire us to replace legacy integrations with modern microservices. Product managers hire us to build a public API that third-party developers will use.
Types of software we ship.
REST API development
Stateless, resource-oriented APIs using HTTP methods. We use Express.js, FastAPI, or Spring Boot with OpenAPI 3.0 specs.
GraphQL API development
Single endpoint with flexible queries. We use Apollo Server, GraphQL Yoga, or Hasura for real-time data fetching.
gRPC API development
High-performance, binary protocol APIs for internal microservices. We use Protocol Buffers with Go or C++ backends.
Webhook integration API
Event-driven APIs that push data to external systems. We use Stripe webhooks, SendGrid events, and custom retry logic.
Third-party API integration
Connect your product to Salesforce, HubSpot, Shopify, or QuickBooks. We handle OAuth 2.0, rate limiting, and data sync.
Public API gateway
Expose your product as a public API with authentication, rate limiting, and documentation. We use Kong, AWS API Gateway, or Zuplo.
Microservices API mesh
Decouple your monolith into independent services with service-to-service communication. We use Docker, Kubernetes, and Istio.
Real-time API (WebSocket)
Low-latency, bidirectional APIs for chat, live dashboards, and notifications. We use Socket.IO, WebSocket, or MQTT.
We build for every business type.
SaaS platforms
Healthcare
Fintech
Ecommerce
Enterprise integrations
Why hire a senior custom API development firm
Building a production API is not a junior task. You need engineers who understand idempotency, rate limiting, and security from day one.
IRPR has shipped 200+ products across 50 countries. Every API we build includes automated tests, CI/CD pipelines, and monitoring with Datadog or Sentry. We use OpenAPI 3.0 for documentation and Postman collections for testing.
Our engineers have built APIs that handle 10,000 requests per second for fintech platforms and 99.9% uptime for healthcare systems. We write code in TypeScript, Go, Python, and Rust depending on your performance needs.
Generic dev shop vs senior custom API development firm
Not all agencies can build a secure, scalable API. Here is the difference between a generic shop and IRPR.
Generic shops often assign junior developers who learn on your dime. They skip load testing, ignore security audits, and deliver undocumented endpoints. You end up with technical debt and a rewrite in 6 months.
IRPR assigns senior engineers only. Every API includes automated tests, rate limiting, authentication (JWT or OAuth 2.0), and a Postman collection. We deliver source code in your repo with a CI/CD pipeline on GitHub Actions.
- Junior developers with 2 years experience
- No load testing before launch
- No API documentation
- No rate limiting or throttling
- No security audit for compliance
- Hourly billing with no cap
- Senior engineers with 10+ years experience
- Load testing with k6 or Artillery
- OpenAPI 3.0 documentation
- Rate limiting with Redis or Kong
- Security audit for HIPAA, PCI-DSS, SOC 2
- Fixed price from Roadmap phase
Our API development process in 4 phases
We follow a structured process from idea to release. Each phase has a clear deliverable and a fixed timeline.
Phase 1 is the Idea phase where we map your business logic to API endpoints. Phase 2 is the Roadmap phase where we write the technical spec and give you a fixed price. Phase 3 is the Product phase where we build and test. Phase 4 is the Release phase where we deploy and monitor.
The entire process takes 12 weeks on average. You get a working API with documentation, tests, and a CI/CD pipeline. We also provide 30 days of post-launch support.
What ships with every API project
Every API we build includes these deliverables by default. No hidden costs, no missing pieces.
You get the full source code in your GitHub or GitLab repo. We set up CI/CD with GitHub Actions or GitLab CI. We configure error tracking with Sentry and uptime monitoring with Datadog.
We also provide a Postman collection with example requests, an OpenAPI 3.0 spec file, and a deployment guide. Everything is documented so your team can take over immediately.
- Source code in your GitHub repo
- CI/CD pipeline on GitHub Actions
- Sentry error tracking
- Datadog uptime monitoring
- OpenAPI 3.0 specification
- Postman collection with examples
- Rate limiting with Redis
- Authentication (JWT or OAuth 2.0)
- Load test results from k6
- Deployment guide and runbook
What we ship in this practice.
Payment processing API for a fintech startup
Built a REST API that handles 5,000 transactions per minute with PCI-DSS compliance. Used Node.js, PostgreSQL, and Stripe Connect. Reduced payment failure rate by 40%.
Patient data API for a telehealth platform
Designed a HIPAA-compliant GraphQL API for patient records, appointments, and video sessions. Used Apollo Server, MongoDB, and Twilio. Cut data retrieval time from 3 seconds to 200ms.
Inventory sync API for an ecommerce brand
Built a real-time WebSocket API that syncs inventory across Shopify, Amazon, and a warehouse system. Used Node.js, Redis, and RabbitMQ. Eliminated overselling entirely.
Public API for a SaaS analytics platform
Created a public REST API with API keys, rate limiting, and usage analytics. Used FastAPI, PostgreSQL, and Kong. Onboarded 50 third-party developers in the first month.
Microservices API for a logistics company
Decoupled a monolith into 12 microservices with gRPC communication. Used Go, Docker, Kubernetes, and Istio. Reduced deployment time from 2 hours to 5 minutes.
Real-time data API for a media platform
Built a WebSocket API that streams live sports scores to 100,000 concurrent users. Used Node.js, Redis Pub/Sub, and AWS ElastiCache. Achieved 99.9% uptime during peak events.
Why teams hire us.
Senior engineers only, no juniors
Every engineer on your project has 10+ years of experience. We do not staff juniors or offshore teams. You get a senior engineer who has built production APIs for companies like Stripe and Twilio.
Fixed price from week 2
After the Roadmap phase (week 2), you get a fixed price quote. No hourly billing, no surprise invoices. The price covers the entire build including testing, documentation, and deployment.
Full code ownership
You own every line of code. We deliver the source code in your GitHub repo with no licensing restrictions. You can take the code to any team after the project ends.
Compliance built in
We build APIs that pass HIPAA, PCI-DSS, SOC 2, and FERPA audits. We include encryption at rest and in transit, access logs, and audit trails. No retrofitting compliance after launch.
12-week delivery guarantee
We ship a working API in 12 weeks on average. Our process is designed for speed without cutting corners. 98% of our projects deliver on time.
Post-launch support included
Every project includes 30 days of post-launch support. We monitor uptime, fix bugs, and help your team take over. No handoff gaps.
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.
─── share this page ───
