Professional Custom API Development PartnerDevelopment Partner
Secure, scalable APIs built by senior engineers. Ship your project in 8-12 weeks with fixed pricing.
IRPR builds professional custom API development partner solutions using REST, GraphQL, and gRPC. We use Node.js, Go, and Python with PostgreSQL, Redis, and Kafka for data-intensive APIs.
A custom API project ships in 8-12 weeks with fixed pricing from $80K to $250K. We handle compliance for HIPAA, PCI-DSS, SOC 2, and FERPA.
Who hires us: CTOs needing a dedicated API team for their platform, founders building API-first products, enterprise IT directors replacing legacy integration layers, and product managers adding third-party data exchange capabilities.
Types of software we ship.
REST API Development
Build RESTful APIs with OpenAPI 3.0 spec, automated documentation, and versioning. Supported by Express, Fastify, or Django REST Framework.
GraphQL API Development
Use Apollo Server or Hasura to create a flexible GraphQL layer. Clients query exactly what they need, reducing overfetching and versioning overhead.
Third-Party API Integration
Integrate with Stripe, Salesforce, HubSpot, or Slack. We handle rate limiting, webhooks, and error recovery with automated retries.
Internal API Gateway
Unify microservices behind a Kong or NGINX gateway. Centralize authentication, logging, and rate limiting for internal tools.
Real-Time API (WebSocket)
Deliver live updates with WebSocket or Server-Sent Events (SSE). Built with Socket.io, Pusher, or AWS AppSync.
Data Aggregation API
Combine data from multiple sources (databases, third-party APIs) into a single queryable endpoint. Uses GraphQL federation or Apollo Router.
Payment API Development
Integrate payment gateways like Stripe, Braintree, or Adyen. Include PCI-DSS compliance, tokenization, and subscription management.
Authentication API (OAuth)
Implement OAuth 2.0 / OpenID Connect with Auth0, Okta, or custom JWT. Support social login, SAML, and role-based access control.
We build for every business type.
SaaS companies
Fintech
Healthcare
Ecommerce
Enterprise Platforms
Why a professional custom API development partner matters
A well-designed API reduces integration time by 60%.
IRPR's API team writes OpenAPI specifications before any code, so your developers know exactly what endpoints to expect. We include contract tests using Dredd to catch breaking changes before they hit production.
Each API ships with rate limiting, caching, and monitoring from day one. Our clients report 40% faster onboarding for new team members because of thorough documentation and migration guides.
The difference between a generic dev shop and a true API partner
IRPR treats your API as a product, not a one-off task.
Most dev shops deliver an API and disappear. Your team is left with little documentation, no versioning, and tight coupling to the frontend. That leads to broken integrations and painful rewrites.
IRPR builds APIs the right way: OpenAPI first, semantic versioning, contract testing, and automated monitoring. Your team gets a well-documented, independently deployable API that evolves without breaking clients.
- No API documentation
- No versioning strategy
- Tight coupling to frontend
- No automated integration tests
- No rate limiting or throttling
- No monitoring or alerting
- OpenAPI 3.0 spec generated from code
- Semantic versioning (major.minor.patch)
- Contract tests with Dredd or Postman
- Rate limiting with Redis or Kong
- Sentry error tracking and Datadog metrics
- API changelog and migration guides
Our API development process: from spec to production
We follow a 4-phase process that guarantees on-time delivery.
Phase 1 and 2 focus on specification and core implementation. You review every endpoint and schema before we write production code.
Phase 3 and 4 add security, deployment, and monitoring. By week 8 you have a fully tested API running in production with CI/CD and alerting.
What you get when you work with IRPR
Every API project ships with documented deliverables.
You receive everything needed to maintain and extend your API independently.
- Source code in your private repository
- OpenAPI 3.0 specification file
- Postman collection for testing
- CI/CD pipeline on GitHub Actions
- Dockerized deployment configuration
- Sentry error tracking setup
- Load testing report with k6
- Security audit summary
- API changelog and migration guide
- 30 days of post-launch support
What we ship in this practice.
Payment Processing API for Fintech Startup
Built a Stripe-connected payment API with automatic retries and webhook handling. Reduced failed payment retries by 80% and saved the client 15 hours/week on manual reconciliation.
Real-Time Inventory API for Ecommerce
Developed a WebSocket-based inventory sync API using Socket.io and PostgreSQL. The client reduced stock discrepancies from 5% to 0.2% across 3 warehouses.
HIPAA-Compliant Patient Data API
Created a FHIR API for a telehealth platform using HAPI FHIR and AWS. Achieved HIPAA compliance in 12 weeks and enabled integration with 10 EHR systems.
Unified Data Aggregation API for SaaS
Combined data from Salesforce, HubSpot, and internal database into a single GraphQL endpoint. Cut report generation time from 2 hours to 15 minutes.
OAuth Authentication API for Enterprise
Implemented OAuth 2.0 with Okta for a B2B platform supporting SSO and role-based access. Reduced login support tickets by 90% and set up automatic user provisioning.
Legacy System Integration API for Manufacturing
Built a REST API layer over an old ERP system using Node.js and Kafka. Enabled real-time production data access and cut order processing time by 40%.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote after the Roadmap phase (week 2). No surprise invoices - the price you see is the price you pay.
Senior engineers only
All team members have 10+ years of experience. No junior devs - you get a lead architect, backend engineer, and DevOps specialist from day one.
8-12 week delivery
We ship your MVP in 8-12 weeks using a proven Sprint framework. 98% of our projects finish on time or early.
Full code ownership
You own all source code, documentation, and CI/CD pipelines. There are no licensing fees or ongoing lock-ins.
Post-launch support included
Every project includes 30 days of bug fixing and monitoring after launch. We don't disappear after deployment.
Compliance built-in
We handle HIPAA, PCI-DSS, SOC 2, and GDPR compliance from the start. Each API is audited before production release.
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.