Experienced Custom API Development ConsultantsAPI Development
We build custom APIs that connect your systems and scale with your business. Our senior engineers deliver in 8-12 weeks with fixed pricing.
IRPR builds custom APIs for applications that need to connect, scale, and secure data exchange. We use Node.js, Python, Go, and serverless architectures on AWS Lambda or Azure Functions.
Every project ships with a production-ready API, OpenAPI documentation, CI/CD pipeline, and monitoring. Timeline is 8-12 weeks for MVPs. Pricing is fixed: $80K-$250K depending on complexity. Compliance built-in: HIPAA, PCI-DSS, SOC 2.
We work with CTOs scaling their product, startup founders needing a payment API, healthcare companies requiring FHIR APIs, and fintech firms integrating with bank systems.
Types of software we ship.
RESTful API Development
Standard HTTP APIs for CRUD operations. Use JSON, OpenAPI, and JWT authentication. Integrates with any frontend or third party.
GraphQL API Development
Flexible query-based APIs for complex data fetching. Use Apollo, Prisma, and real-time subscriptions. Ideal for mobile and dashboard apps.
Third-Party API Integration
Connect your app to Stripe, Salesforce, HubSpot, or custom vendor APIs. Includes error handling, retries, and data sync.
Microservices API Architecture
Decoupled service APIs using Docker, Kubernetes, and Kong. Each service scales independently. Supports event-driven patterns with Kafka.
Real-Time API (WebSocket)
Live data feeds for chat, notifications, or IoT. Use Socket.io, Redis Pub/Sub, and AWS IoT Core. Latency under 100ms.
Payment API Integration
Securely integrate Stripe, Braintree, or Adyen. Handle PCI-DSS compliance, tokenization, and webhook events. Reduce failure rates.
Data API (ETL)
Transform and serve data from multiple sources (PostgreSQL, MongoDB, BigQuery). Use Python, Apache Airflow, and REST endpoints for dashboards.
Authentication & Authorization API
OAuth2, OpenID Connect, SSO with SAML. Implement with Auth0, Okta, or custom. Manage roles, permissions, and token lifecycle.
We build for every business type.
Fintech
Healthcare
Ecommerce
SaaS
Real Estate
API development metrics that matter
We measure what matters for your integration.
IRPR has shipped over 200 API integrations across 50 countries. Our engineers average 15+ years of experience. We track delivery time, uptime, and compliance standards.
Every API project includes a Roadmap phase in week 2 where we lock scope and price. No surprises. 98% of projects deliver on time.
Why IRPR beats generic API shops
Most dev shops treat APIs as just another feature. We treat them as the backbone.
Generic agencies assign junior developers, use hourly billing, and skip architecture reviews. They often miss compliance and have no post-launch plan.
IRPR assigns senior engineers with 15+ years of experience. We deliver fixed-price contracts, architecture-first approach, and built-in compliance. Monitoring and support continue after launch.
- No API architecture review
- Hourly billing - no price guarantee
- Junior or mid-level developers
- No compliance (HIPAA/PCI-DSS)
- No post-launch monitoring
- Scope changes cause delays
- Architecture review in week 1
- Fixed price from Roadmap phase
- Senior engineers only (15+ yrs)
- HIPAA/PCI-DSS built-in
- Post-launch monitoring included
- Scope locked at Roadmap
Our API development process
A repeatable four-phase process that delivers working APIs fast.
Phase 1: Discovery and architecture. We map your data, users, and integration points in one week. This feeds into a detailed Roadmap.
Phase 2: Design and prototyping. We produce OpenAPI specs, mock endpoints, and get stakeholder sign-off before writing production code.
What ships with every custom API
Everything you need to run and maintain the API yourself.
- Source code in your private repo (GitHub/GitLab)
- OpenAPI 3.0 documentation (Swagger UI)
- CI/CD pipeline using GitHub Actions
- API monitoring with Datadog dashboards
- Error tracking with Sentry
- Rate limiting and throttling configuration
- Authentication (OAuth2 / JWT)
- Postman collection with test scripts
- Docker containerization with Dockerfile
- Load test report with k6
What we ship in this practice.
Payment API for Fintech Startup
Built a payment processing API that reduced failed transactions by 40%. Used Node.js, Stripe Connect, PostgreSQL. Achieved PCI-DSS compliance. Handles $2M in monthly payments.
FHIR API for Telehealth Platform
Developed a FHIR-compliant API integrating with Epic and Cerner. Cut integration time by 6 weeks. Used Python FastAPI, Azure FHIR Server. HIPAA audited and passed.
Real-Time Inventory API for Ecommerce
Built a WebSocket API syncing inventory across 50 warehouses with 2-second latency. Used Go, Redis Pub/Sub, AWS IoT Core. Supports 10,000 concurrent connections.
Microservices API for SaaS Platform
Replaced a monolith with 12 microservice APIs. Scaled to 1 million requests per day. Used Kubernetes, Kong API Gateway, Node.js. Reduced deployment time from 2 hours to 10 minutes.
Property Data API for Real Estate Portal
Aggregated MLS data from 10 states into a single GraphQL API. Used Python, AWS Lambda, PostgreSQL. Reduced data load time by 60%.
Single Sign-On API for Enterprise
Implemented OAuth2 and SAML SSO connecting 10,000 users across Okta, Azure AD, and custom IDP. Used Node.js, Auth0, PostgreSQL. Cut login support tickets by 80%.
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. We absorb risk so you don't have to.
Senior engineers only
All engineers have 15+ years of experience. No junior or mid-level developers. You talk directly to the people building your API.
Compliance built-in
We build HIPAA and PCI-DSS compliance into your API from day one. No retrofitting. We've passed audits for fintech and healthcare clients.
12-week delivery guarantee
Most API MVPs ship in 8-12 weeks. We lock scope early and sprint to production. On-time delivery rate is 98% across 200+ projects.
Full code ownership
You own all source code and documentation. No licensing fees, no lock-in. You can continue development with your own team after launch.
Ongoing monitoring included
We set up Datadog, Sentry, and uptime monitoring for 30 days post-launch. You get alerts for errors, latency, and failure rates.
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.