Premium Custom API Development VendorAPI Development
We build secure, high-performance APIs that power your core products. Get a fixed-price contract and ship in 12 weeks.
IRPR is a premium custom API development vendor that builds production-ready APIs using RESTful design, GraphQL, gRPC, and event-driven architectures. Our engineers write every endpoint with automatic documentation (OpenAPI/Swagger), rate limiting, and full test coverage.
Every custom API project ships within 8 to 12 weeks at a fixed price between USD 80,000 and USD 250,000. We handle compliance out of the box — HIPAA for healthcare, PCI-DSS for payments, and SOC 2 for SaaS backends.
We work with CTOs who need a secure partner for platform integrations, product managers launching B2B API products, enterprise architects modernizing legacy monoliths, and founders who want their SaaS MVP to have an API-first architecture from day one.
Types of software we ship.
RESTful API Backend
Resource-oriented endpoints with full CRUD, pagination, sorting, and filtering. Built on Express, FastAPI, or Spring Boot.
GraphQL API Layer
Single endpoint with flexible queries, mutations, and subscriptions. Uses Apollo, Hasura, or Relay with batching and caching.
Microservice API Gateway
Central gateway aggregating multiple internal services. Implements Kong, Envoy, or NGINX with rate limiting and circuit breakers.
Real-Time WebSocket API
Persistent connection for live data — chat, dashboards, IoT. Powered by Socket.io, WebSocket Secure, or MQTT brokers.
Third-Party API Integration
Custom connectors to Stripe, Salesforce, HubSpot, or any REST/GraphQL provider. Includes retry logic and webhook handling.
Mobile Backend API
Lightweight JSON APIs optimized for low bandwidth and offline-first sync. Uses Firebase, AWS AppSync, or custom Node.js.
Internal API for SaaS Product
Internal REST/GraphQL APIs that power your frontend and external integrations. Built with role-based access and audit logging.
Payment Processing API
Secure payment endpoints with PCI Level 1 compliance. Integrates Stripe, Braintree, or Adyen with idempotency and dispute handling.
We build for every business type.
E-commerce & Retail
Healthcare & Life Sciences
Fintech & Banking
SaaS & Platform Companies
Logistics & Supply Chain
Why choose a premium custom API development vendor
A poorly designed API costs you weeks of integration time and creates security holes. We build APIs that developers love and auditors approve.
Every API we design follows the OpenAPI 3.0 specification. You get interactive documentation at /api-docs from day one. Our endpoints enforce idempotency, pagination limits, and consistent error format (RFC 7807). We also include rate limiting (token bucket), OAuth 2.0 authentication, and full test coverage with 95%+ line coverage.
Our premium custom API development vendor approach means you own the complete source code, CI/CD pipeline, and deployment artifacts. We hand off a Postman collection, integration tests, and a runbook on day one of the release. No black boxes, no hidden subscriptions.
The difference between generic API shops and a premium vendor
Not all custom API development vendors deliver the same quality. Here is how IRPR stands apart from the rest.
Many agencies treat APIs as a side deliverable — they build the frontend first and glue on a half-baked API. That approach leads to breaking changes, undocumented endpoints, and security gaps. IRPR treats the API as the core product. We design for scalability, security, and developer experience from the specification phase.
When you hire a premium custom API development vendor like IRPR, you get a dedicated solution architect who owns the API contract, a senior engineer writing every endpoint, and a QA engineer running load tests (1000 concurrent users minimum). We ship a production-ready API with monitoring (Datadog, Sentry) and alerts on P99 latency.
- No API contract before coding starts
- No automated tests for endpoints
- No monitoring or alerting setup
- No documentation beyond basic README
- No rate limiting or throttling
- No security audit before production
- OpenAPI 3.0 contract approved before first line of code
- 95%+ line coverage with Postman and unit tests
- Datadog metrics and Sentry error tracking on every API
- Auto-generated interactive documentation at /api-docs
- Token bucket rate limiting and OAuth 2.0 out of the box
- HIPAA/PCI compliance verified during the audit phase
Our 4-phase process for building premium custom APIs
From idea to release, our process is designed to eliminate surprises and deliver a production-ready API on a fixed budget.
Every project starts with a 2-week Roadmap phase where we define the API contract, data model, and integration points. You approve the OpenAPI spec before we write a single line of backend code. This step alone prevents 80% of mid-project changes.
After the Roadmap, we build the API in 2-week sprints with real demos every cycle. The final phase includes load testing (up to 10,000 requests per minute) and a full security scan. You get a signed code ownership letter and deployment playbook.
What ships with every premium custom API project
When you choose IRPR as your premium custom API development vendor, you get more than just endpoints. Here is the full delivery checklist.
We treat the API as a product. That means every project ships with documentation, tests, monitoring, and deployment tooling. You can hire another team next year and they will be productive in under a week.
No hidden recurring fees. No proprietary frameworks. Everything we build runs on your cloud account in your code repository.
- Full source code in your private GitHub/GitLab repo
- CI/CD pipeline with GitHub Actions (or GitLab CI)
- Interactive OpenAPI documentation at /api-docs
- Postman collection with 100+ example requests
- Automated unit and integration tests (95%+ coverage)
- Sentry error tracking and Datadog APM dashboards
- Docker Compose setup for local development
- Deployment runbook with step-by-step rollback plan
- Security scan report (OWASP Top 10 verified)
- Load test results (minimum 1,000 concurrent users)
What we ship in this practice.
Payment Gateway API for a Fintech Startup
Built a PCI-compliant payment API that handles 50,000 transactions per day. Integrated with Stripe, Plaid, and a custom fraud scoring engine. Reduced payment failure rate by 22% and cut integration time for merchant partners from 6 weeks to 2 days. Tech stack: Node.js, PostgreSQL, Redis, Stripe API, Datadog.
EHR Integration API for a Telemedicine Platform
Designed a HIPAA-compliant API to connect telemedicine sessions with Epic and Cerner EHR systems. Allowed real-time lab result retrieval and appointment syncing. Reduced manual data entry by 8 hours per provider per week. Tech stack: FastAPI, FHIR R4, RabbitMQ, AWS HealthLake.
Multi-Channel Inventory API for an Ecommerce Brand
Created a unified inventory API that synchronizes stock across Shopify, Amazon, and a physical warehouse. Achieved 99.9% inventory accuracy and eliminated overselling during Black Friday. Processed 2,000 orders per minute at peak. Tech stack: NestJS, MongoDB, AWS Lambda, Shopify REST API.
SaaS Billing API with Webhook Orchestration
Developed a billing API for a B2B SaaS company handling 10,000 subscriptions across 30 plans. Integrated Stripe, Chargebee, and Salesforce. Automated invoice generation and dunning emails, reducing churn by 15%. Tech stack: Go, PostgreSQL, Stripe API, Celery, Redis.
Logistics Tracking API for a 3PL Provider
Built a real-time tracking API that aggregates data from 5 carrier partners (FedEx, UPS, USPS, DHL, regional). Provides shipment status, ETA, and proof-of-delivery images. Reduced customer support calls by 40%. Tech stack: Node.js, WebSocket, MongoDB, AWS S3, Datadog.
Real Estate MLS Integration API
Constructed an API that bridges a real estate platform with 12 MLS providers across 3 states. Supports full property listing sync, open house scheduling, and agent commission calculations. Increased listing accuracy from 85% to 99%. Tech stack: Ruby on Rails, PostgreSQL, Elasticsearch, Redis.
Why teams hire us.
Fixed price, not hourly billing
Every project gets a fixed quote after the Roadmap phase (week 2). You pay that amount regardless of how many hours our engineers spend. No surprise invoices, no time tracking drama.
Senior engineers only, no junior buffers
Our team consists of engineers with 10+ years experience each. We never staff juniors or offshore interns. Every API endpoint is written by a senior developer who has shipped production APIs before.
HIPAA and PCI compliance built in
We handle compliance from day one. Our APIs include audit logging, encryption at rest (AES-256), and encrypted TLS 1.3 traffic. We have delivered APIs for 12 healthcare clients and 8 fintech clients.
You own 100% of the code and IP
After the project, you have full ownership of the source code, documentation, tests, and deployment scripts. No licensing fees, no vendor lock-in. You can take the code and run it anywhere.
Async-first, timezone-friendly delivery
Our team works overlapping hours with US time zones (6 AM to 2 PM Pacific). We communicate via Slack and shared GitHub repos. You get daily standup summaries and sprint reviews every two weeks.
Production-grade monitoring and alerting
Every API ships with Datadog dashboards for P99 latency, error rates, and throughput. We configure Sentry error tracking and PagerDuty alerts. Your team knows about issues before customers do.
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.