Custom API Development DevelopersAPI Development
You need a custom API built by developers who ship on time and on budget. IRPR delivers production-grade APIs with fixed pricing and full code ownership.
IRPR builds custom APIs for companies that need reliable backend services. We use Node.js, Python, Go, Postgres, Redis, Kafka, and cloud-native tools like Docker and Kubernetes.
A custom API development project ships in 8-12 weeks for an MVP with pricing from $80K to $250K. Every API is built to HIPAA, PCI-DSS, or SOC 2 standards as needed.
CTOs building internal APIs for microservices, product owners integrating third-party platforms, data teams needing ETL pipelines, and SaaS companies launching public APIs all hire us. They want a fixed price, a clear timeline, and full code rights.
Types of software we ship.
RESTful API
Standard JSON-based API following REST principles. Built with Express.js or FastAPI and documented using OpenAPI 3.0.
GraphQL API
Flexible query language API for modern frontends. Built with Apollo Server or Yoga, integrated with Postgres or MongoDB.
Webhook Service
Event-driven API that sends real-time notifications to external systems. Uses Stripe or Twilio webhooks and Redis queues.
Real-time WebSocket API
Persistent connection API for live data updates. Built with Socket.io or WebSocketSharp, used in chat and live dashboards.
Internal Microservice API
Lightweight, isolated API for service-to-service communication. Uses gRPC or RabbitMQ and deployed on Kubernetes clusters.
Third-party API Integration
Bridge API that connects your system to Salesforce, HubSpot, Stripe, or AWS. Handles rate limiting and data transformation.
Public API Gateway
Managed API layer for external consumers with authentication and rate limiting. Uses Kong or AWS API Gateway and OAuth2.
ETL Data Pipeline API
Batch or streaming API that extracts, transforms, and loads data between sources. Built with Airflow or Kafka Connect and Postgres.
We build for every business type.
SaaS Platforms
Fintech
Healthcare
Ecommerce
Logistics
Why Custom API Development Developers Matter
Hiring the right developers for your custom API means faster time to market and lower risk.
A poorly designed API leads to integration headaches, security vulnerabilities, and costly rewrites. We have shipped over 200 products across 50 countries, and 98% of our custom API projects deliver on time with no scope creep.
Our developers write every API with automated tests, rate limiting, and monitoring from day one. You get a production-ready service that can handle thousands of requests per second without breaking.
How IRPR Compares to Generic API Development Shops
Not all custom API development developers work the same way. Here's what you get with IRPR.
When you hire a generic agency, you often get junior devs, hourly billing, and vague timelines. The result is an API that works on paper but fails under load.
IRPR assigns senior engineers with 10+ years of experience. We scope everything in the Roadmap phase (week 2) and give you a fixed price. No surprise invoices, no delays.
- Junior developers with little API experience
- Hourly billing that blows your budget
- No written architecture before coding starts
- No load testing or performance guarantees
- You don't own the source code
- Integration testing is an afterthought
- Senior engineers only (10+ years average)
- Fixed price from the Roadmap phase
- Full architecture document before any code
- Load testing at 10x expected traffic
- You own 100% of the code from day one
- Integration tests with CI/CD on every push
Our Process for Building Your Custom API
We follow a clear 4-phase process to get your custom API from idea to production.
Every custom API development project starts with a 2-week Discovery sprint. You talk directly to a senior engineer who maps your data flows, endpoints, and security requirements.
The Roadmap phase (week 2) produces a fixed-price proposal with a full timeline. You can start coding in week 3 and have a working MVP in 8 to 12 weeks.
What Ships with Every Custom API Project
Every custom API we build includes these deliverables by default.
We don't just hand you code. You get everything needed to maintain and scale your API independently.
Our standard delivery includes source code, infrastructure as code, automated tests, and production monitoring.
- Source code in your private GitHub or GitLab repo
- Full OpenAPI / Swagger documentation
- CI/CD pipeline with GitHub Actions or GitLab CI
- Docker containerization and docker-compose config
- Rate limiting and authentication (OAuth2 / JWT)
- Load testing scripts (k6 or Artillery)
- Error tracking with Sentry or DataDog
- Production monitoring dashboard (Grafana + Prometheus)
- Deployment guide and runbook
- 30-day post-release support with SLA
What we ship in this practice.
Multi-tenant SaaS API
Built a tenant-aware REST API for a B2B SaaS platform. Reduced onboarding time from 2 weeks to 2 days. Stack: Node.js, Postgres, Redis, Auth0.
HIPAA-Compliant Patient Data API
Developed a FHIR-based API for a telemedicine startup. Achieved HIPAA compliance and reduced patient data retrieval time by 60%. Stack: Python, FastAPI, AWS, FHIR.
Payment Orchestration API
Created a unified API that routes transactions across Stripe, PayPal, and Braintree. Handled 500k+ transactions per month with 99.99% uptime. Stack: Go, Postgres, Kafka.
Real-time Inventory API
Built a WebSocket-based API for a national retailer to sync inventory across 200 warehouses. Cut stock discrepancies by 80 percent. Stack: Node.js, Socket.io, Redis, MongoDB.
GPS Tracking API for Fleet Management
Delivered a REST + WebSocket API that ingests GPS data from 5000+ vehicles. Reduced route planning time by 40%. Stack: Go, Postgres, MQTT, AWS IoT.
EdTech Gradebook API
Built a GraphQL API for a K-12 analytics platform. Integrated with 10+ student information systems and saved teachers 5 hours per week on data entry. Stack: GraphQL, Apollo, Postgres, FERPA compliant.
Why teams hire us.
Fixed price from week 2
We scope everything in the Roadmap phase and give you a locked-in price. No hourly billing, no surprise charges.
Full code ownership
You own every line of code we write. No licenses, no hidden fees, no vendor lock-in. The repo is yours from day one.
Senior engineers only
Every developer on your project has 10+ years of experience. We don't staff juniors or offshore teams.
Compliance built in
We build HIPAA, PCI-DSS, SOC 2, and FERPA compliance into the API architecture. No retrofitting after launch.
8 to 12 week delivery
Your first working version ships in 8 to 12 weeks. You can demo it, test it, and start integrating before full release.
Dedicated project manager
A single point of contact ensures clear communication, weekly demos, and no surprises. You talk to your PM every week.
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.