Senior Custom API Development PartnerCustom API
We build production-grade APIs with a team of senior engineers. Your first release ships in 8 to 12 weeks with fixed pricing.
IRPR builds custom APIs for startups and enterprises that need a reliable technical partner. We use Node.js, Python, PostgreSQL, and AWS Lambda to create REST, GraphQL, and WebSocket endpoints that handle millions of requests per day.
Each project ships in 8 to 12 weeks with fixed pricing between $60K and $150K depending on scope. We deliver production-ready code with full CI/CD, monitoring, and API documentation. Teams are 100% senior engineers with experience in HIPAA, PCI-DSS, and SOC 2 compliance.
CTOs at SaaS companies hire us when their internal team is overloaded. VP of Engineering at fintech firms use us to build compliant payment APIs. Product managers at healthcare startups bring us in to accelerate HIPAA-compliant data exchange. Startup founders partner with us to launch their API-driven product on a fixed timeline.
Types of software we ship.
REST API Development
RESTful endpoints with OpenAPI specs, versioning, and rate limiting. We integrate with AWS API Gateway and CloudFront.
GraphQL API Development
GraphQL layers that unify multiple data sources. Use Apollo Server, Prisma, and subscription support for real-time updates.
WebSocket API Development
Real-time bidirectional APIs for chat, live notifications, and collaborative editing. Background with AWS WebSocket API and Socket.IO.
Microservice API Development
Decoupled service boundaries with event-driven messaging. We use Kafka, NATS, and Docker to deploy on Kubernetes.
Public API / Third-Party API
Developer-facing APIs with authentication, usage tracking, and documentation portals. Powered by Stripe Billing and Postman.
Internal / Private API
Internal APIs for connecting legacy systems and internal tools. Integrated with Okta SSO and Datadog monitoring.
Partner API / B2B Integration
White-label APIs for partner integrations with custom rate limits, roles, and audit logs. Built on Auth0 and Kong.
Payment API Development
PCI-DSS Level 1 compliant payment processing APIs. Tokenization with Stripe, Braintree, and custom vaults for fintech.
We build for every business type.
SaaS Companies
Fintech Firms
Healthcare Organizations
Ecommerce Brands
Logistics & Supply Chain
Why choose a senior custom API development partner
Building APIs in-house takes months and often misses compliance and performance targets.
IRPR has shipped over 200 API projects across 50 countries. Every project is led by a senior engineer with at least 8 years of experience. We don't hire juniors or offshore teams. This means your API is built right the first time with proper error handling, logging, and security.
Our process starts with a 2-week Roadmap phase. You get a fixed quote, a detailed architecture diagram, and a timeline before a single line of code is written. This eliminates surprises and keeps the project on track.
The difference between IRPR and a generic dev shop
Most dev shops hide scope creep in vague hourly billing. IRPR works differently.
When you hire a generic agency, you often get a junior team, unclear specs, and surprise overages. They bill by the hour and rarely enforce code quality standards. You end up with technical debt that slows down future development.
IRPR assigns only senior engineers. Every project has a fixed price set during the Roadmap phase. We ship with a complete CI/CD pipeline, API documentation, and monitoring from day one. Your team owns the full source code and can continue development without us.
- Junior or mixed-skill teams
- Hourly billing with no cap
- Unclear API specs
- No CI/CD set up
- Delayed delivery
- No compliance expertise
- 100% senior engineers (8+ years)
- Fixed price from Roadmap phase
- Detailed architecture docs upfront
- CI/CD, monitoring, and logging built-in
- 8-12 week delivery
- HIPAA, PCI-DSS, SOC 2 compliance built-in
How we build your custom API in 4 phases
Each phase is designed to minimize risk and maximize speed.
The entire process takes 8 to 12 weeks from kickoff to production release. We start with discovery to define your requirements, then move through roadmap, development, and launch. Each phase ends with a clear deliverable.
During the build phase we work in 2-week sprints. You see working code every two weeks. By the time we reach launch, the API is already running in staging with full monitoring.
What ships with your API project
Every project includes everything needed to run and maintain the API independently.
We don't just hand over code. Every delivery includes documentation, infrastructure, and monitoring so your team can operate without us. You get full ownership of all artifacts from day one.
Our standard delivery includes source code in your GitHub or GitLab repository, a CI/CD pipeline using GitHub Actions, infrastructure defined in Terraform, and API documentation generated with OpenAPI and Postman.
- Source code in your private repository (GitHub/GitLab)
- CI/CD pipeline with automated testing and deployment
- Infrastructure as code with Terraform and AWS CloudFormation
- API documentation (OpenAPI 3.0 + Postman collection)
- Monitoring dashboard with Datadog and error tracking with Sentry
- Load testing results and performance benchmarks
- Security audit report (OWASP Top 10 scan)
- Deployment runbook and operational guides
- Postman environment for staging and production
What we ship in this practice.
Payment Gateway API for Fintech Startup
Built a PCI-DSS Level 1 compliant payment API processing $2M per month. Integrated with Stripe Connect and custom token vault. Reduced integration time for merchants from 3 months to 2 weeks.
HIPAA-Compliant Patient Data Exchange API
Developed a FHIR-based API connecting 3 hospital systems and 2 EHR platforms (Epic and Cerner). Handles 500k patient records per day with end-to-end encryption. Achieved HIPAA audit pass in 6 weeks.
Real-Time Inventory API for Ecommerce Platform
Created a WebSocket API that syncs inventory across 12 warehouses in real time. Reduced overselling incidents by 95%. Stack: Node.js, Redis Pub/Sub, AWS Fargate.
Partner Integration API for SaaS B2B Platform
Built a public API with OAuth2 and rate limiting for 50+ partner integrations. Increased partner onboarding speed by 70%. Used Kong API Gateway, Auth0, and PostgreSQL.
Logistics Tracking API for Freight Company
Developed a GraphQL API providing real-time shipment tracking across 5 carriers. Reduced support calls about delivery status by 60%. Stack: Apollo Server, Prisma, PostgreSQL.
Microservice API for Media Content Platform
Created 12 microservices handling video encoding, metadata, and user subscriptions. Achieved 99.99% uptime with Kafka and Kubernetes. Reduced infrastructure costs by 40% compared to monolith.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote after the 2-week Roadmap phase. No hourly billing, no surprise charges, no scope creep fees. You know the cost before development starts.
Senior engineers only
Every engineer on your project has at least 8 years of experience. No juniors, no offshore trainees. Our average engineer has 12 years of experience building scalable APIs.
8 to 12 week delivery
We ship your first API release in 8 to 12 weeks. Our focused sprints and senior team eliminate churn. 98% of our projects deliver on time.
Compliance built-in from day one
HIPAA, PCI-DSS, and SOC 2 aren't an afterthought. We design authentication, encryption, and logging to meet regulatory requirements before writing a line of code.
Full code ownership
You own all source code, documentation, and infrastructure from the first commit. No licensing fees, no vendor lock-in. You can maintain the API with any team after launch.
Async-first communication with overlap hours
Our team works across time zones but overlaps with US business hours (9am-2pm EST). You get async updates daily and synchronous calls weekly. No waiting for responses.
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.