Leading Custom API Development FirmAPI Development
We build secure, scalable APIs for your product. 8-12 weeks from spec to production.
IRPR is a leading custom API development firm. We build REST, GraphQL, and gRPC APIs on Node.js, Python, Go, and .NET. Every API includes OpenAPI specs, automated tests, and monitoring with Datadog.
We ship production-ready APIs in 8-12 weeks. Pricing is fixed: $80K-$250K per project. All APIs meet HIPAA, PCI-DSS, or SOC 2 compliance as needed. We own the code until you pay, then you own it fully.
CTOs hire us to replace legacy SOAP APIs with modern REST services. Product managers hire us to build the backend for their SaaS MVP. Healthtech founders hire us to build HIPAA-compliant FHIR APIs. Fintech VPs hire us to build PCI-DSS payment APIs.
Types of software we ship.
REST API Development
Build stateless, resource-oriented APIs with JSON payloads. Use Express.js, FastAPI, or ASP.NET Core. Includes OpenAPI 3.0 docs.
GraphQL API Development
Single endpoint with flexible queries. Use Apollo Server or Hasura. Reduces over-fetching by 40% vs REST.
gRPC API Development
High-performance RPC for microservices. Use Protocol Buffers. 5x faster than JSON REST. Ideal for internal services.
Webhook API Development
Event-driven push notifications. Use Stripe-style webhooks. Support retries, idempotency, and signature verification.
Third-Party API Integration
Connect your app to Stripe, Salesforce, HubSpot, Twilio, or 200+ other APIs. Handle rate limits, OAuth2, and error mapping.
API Gateway & Management
Deploy Kong, AWS API Gateway, or NGINX. Add rate limiting, caching, authentication, and analytics.
Internal API / Microservices API
Break monolithic apps into microservices. Use message queues (RabbitMQ, Kafka) and service discovery (Consul).
Public API / Developer Portal
Expose your product as a public API. Build developer docs (Stoplight, ReadMe), API keys, and usage dashboards.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics & Travel
Why Choose a Leading Custom API Development Firm
Most API projects fail because the team doesn't understand security, scaling, or integration complexity.
IRPR has shipped 200+ custom APIs across 50+ countries. We use OpenAPI 3.0 for documentation, Postman for testing, and Datadog for monitoring. Every API includes rate limiting, authentication (OAuth2, JWT, API keys), and error handling with proper HTTP status codes.
We design APIs for 10x growth. Your API starts with a load-tested baseline of 10,000 requests per second. We add caching with Redis, database indexing, and auto-scaling on AWS or GCP. You get a production-ready API that handles spikes without crashing.
How We Build APIs Differently
Most API development shops start coding on day one. We don't.
We start with a 2-week Roadmap phase. We map your data model, define endpoints, write OpenAPI specs, and review with your team. You approve the spec before any code is written. This eliminates rework and cost overruns.
Then we build in 2-week sprints. Each sprint delivers a working, deployable API. You see progress every 14 days. We use GitHub Actions for CI/CD, Docker for containerization, and Kubernetes for orchestration. No black box. No surprises.
- Starts coding without API spec
- No automated tests for endpoints
- No rate limiting or auth built in
- No monitoring or alerting
- Hourly billing with no cap
- Code ownership unclear
- OpenAPI spec approved before coding
- 100% test coverage for all endpoints
- JWT + OAuth2 + rate limiting by default
- Datadog monitoring + PagerDuty alerts
- Fixed price from Roadmap phase
- Full code ownership on delivery
Our API Development Process
Four phases. 8-12 weeks. No fluff.
We use a proven process that IRPR has refined over 200+ projects. Every phase has a clear deliverable. You approve before we move to the next phase.
The process works for any API type: REST, GraphQL, gRPC, or webhook. We adapt the timeline based on complexity, but 8-12 weeks is typical for most custom APIs.
What Ships with Your Custom API
You get more than just endpoints. Every API project includes these deliverables by default.
No hidden fees. No forgotten items. Everything listed here is included in the fixed price from the Roadmap phase.
- OpenAPI 3.0 specification (YAML/JSON)
- Source code in your GitHub or GitLab repo
- Postman collection with example requests
- CI/CD pipeline with GitHub Actions or GitLab CI
- Docker containers for local development
- Automated test suite (unit + integration + e2e)
- API documentation hosted on Stoplight or ReadMe
- Monitoring dashboard on Datadog with 4 key metrics
- Error tracking with Sentry
- Deployment script for AWS, GCP, or Azure
What we ship in this practice.
FHIR API for a Telehealth Startup
Built a HIPAA-compliant FHIR API for patient data exchange. Integrated with Epic and Cerner. Reduced manual data entry by 12 hours per week. Tech stack: Node.js, PostgreSQL, AWS, Datadog.
Payment Processing API for a Fintech SaaS
Built a PCI-DSS Level 1 compliant payment API. Tokenized card data with Vault. Processed $2M in transactions in month one. Tech stack: Python, FastAPI, Stripe, Redis, Docker.
Product Catalog API for an Ecommerce Brand
Built a GraphQL API for product catalog, inventory, and pricing. Connected to Shopify and Amazon. Reduced page load time by 60%. Tech stack: Apollo Server, MongoDB, AWS Lambda.
Subscription Billing API for a SaaS Platform
Built a billing API with Stripe integration. Handled proration, upgrades, downgrades, and cancellations. Reduced churn by 15% with smart retries. Tech stack: Node.js, Express, Stripe, PostgreSQL.
MLS Integration API for a Real Estate Platform
Built a REST API to sync MLS listings from 5 different providers. Normalized data into a single schema. Added 10,000+ listings in the first week. Tech stack: Python, Django, Celery, Redis.
Shipment Tracking API for a Logistics Company
Built a webhook-based API for real-time shipment tracking. Connected to FedEx, UPS, and USPS. Reduced support tickets by 30%. Tech stack: Go, gRPC, Kafka, TimescaleDB.
Why teams hire us.
Fixed price, not hourly billing
Every API project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. If we miss a deadline, we work extra at no cost.
Full code ownership
You own every line of code from day one. We put the code in your repository. No licenses, no royalties, no lock-in. You can take the API to any team after delivery.
Compliance built in, not bolted on
We build HIPAA, PCI-DSS, SOC 2, and FERPA compliance into the API architecture from the start. No retrofitting. No compliance gaps. We've passed 20+ third-party audits.
Senior engineers only
Every API is built by a senior engineer with 8+ years of experience. No juniors, no offshore body shops. Our average engineer tenure at IRPR is 4 years.
Production monitoring included
We set up Datadog monitoring, Sentry error tracking, and PagerDuty alerts as part of every project. You get a dashboard with 4 key metrics: uptime, latency, error rate, and throughput.
8-12 week delivery guarantee
We ship production-ready APIs in 8-12 weeks. Our on-time rate is 98% across 200+ projects. If we're late, we reduce the final invoice by 10% per week past the deadline.
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.