Best Custom API Development DevelopersAPI Development
We build production-ready APIs in 8-12 weeks. Fixed price, full code ownership.
IRPR builds custom APIs using Node.js, Python, Go, and GraphQL. We ship REST and GraphQL APIs with OpenAPI specs and automated testing.
Projects deliver in 8-12 weeks with prices from $80K to $250K. All APIs meet HIPAA, PCI-DSS, or SOC 2 compliance as needed. We provide fixed pricing after a 2-week Roadmap phase.
We work with CTOs needing scalable integrations, product owners launching data-intensive platforms, engineering leads moving to microservices, and startup founders requiring rapid API prototyping.
Types of software we ship.
RESTful API
Stateless HTTP APIs using Express.js or FastAPI. Includes versioning, rate limiting, and Swagger documentation.
GraphQL API
Flexible query APIs built with Apollo Server or Hasura. Reduces over-fetching and speeds up frontend development.
Microservices Gateway
API gateway using Kong or NGINX. Routes requests, handles authentication, and aggregates multiple microservices.
WebSocket API
Real-time bidirectional APIs with Socket.IO or WebSocket protocols. Ideal for live chat, notifications, and streaming data.
Third-party Integration
Custom connectors for Stripe, Salesforce, HubSpot, and 200+ other services. Handles OAuth, webhooks, and data sync.
Internal Backend API
Private APIs for internal systems using Django REST or NestJS. Includes RBAC, audit logging, and database abstraction.
Public Developer Portal
Self-service API portals with Swagger UI, API keys, usage analytics, and documentation. Built with React and Docusaurus.
Event-Driven API
Async event streams using Apache Kafka or RabbitMQ. Enables decoupled services with guaranteed message delivery.
We build for every business type.
Fintech
Healthcare
Ecommerce
SaaS
Logistics
How we deliver best custom API development developers results
Our approach ensures your API is performant, secure, and ready for scale from day one.
Every API project starts with a 2-week Roadmap phase. During this phase we define endpoints, data models, authentication flows, and compliance requirements. You get a fixed price and a clear timeline before any development starts.
We use automated CI/CD pipelines with GitHub Actions, Sentry error monitoring, and Datadog performance tracking. Each API ships with complete OpenAPI documentation, Postman collections, and load test results.
What sets best custom API development developers apart
Most agencies overpromise and underdeliver. We do the opposite.
Generic development shops often lack API-specific expertise. They deliver code that works but fails under load or is impossible to maintain. Their billing is hourly and scope creeps endlessly.
IRPR builds APIs with senior engineers who have deep experience in REST, GraphQL, microservices, and event-driven architectures. We fix the price upfront and ship in 8-12 weeks.
- Hourly billing with unpredictable costs
- No API-specific design patterns
- Missing OpenAPI documentation
- No load testing or performance benchmarking
- Code ownership often unclear
- Post-launch support is an upsell
- Fixed price after 2-week Roadmap phase
- Senior engineers with 10+ years API experience
- OpenAPI specs and Postman collections shipped
- k6 or Artillery load tests included
- Full code ownership in your repository
- 2 weeks of free post-launch support
Our process for best custom API development developers
A structured approach that removes guesswork and delivers on time.
We follow the Idea - Roadmap - Product - Release framework. Each phase has clear deliverables and a go/no-go gate. By the end of week 2 you have a complete API specification and a fixed price.
During development we deploy to staging environments every 3 days. You see working endpoints, test them with Swagger UI, and provide feedback in real time. No surprises at the end.
What ships with your custom API
Everything you need to run, scale, and maintain your API independently.
We ship more than just code. Every project includes documentation, monitoring, and deployment infrastructure. Your team can take over immediately.
- Source code in your private GitHub/GitLab repository
- OpenAPI 3.0 specification file
- Postman collection with all example requests
- CI/CD pipeline using GitHub Actions or GitLab CI
- Sentry error and performance monitoring
- Datadog dashboard for API metrics and alerts
- Load test scripts using k6 or Artillery
- Deployment playbook with environment variables
- Docker Compose file for local development
- 2-week post-launch support period
What we ship in this practice.
Fintech Payment Aggregation API
Built a unified payment API integrating Stripe, PayPal, and Plaid. Reduced transaction failure rate from 4% to 0.5%. Tech stack: Node.js, PostgreSQL, Redis, Docker.
Healthcare FHIR Data Exchange API
Designed a HIPAA-compliant FHIR API for a telemedicine platform. Enabled secure data sharing across 12 hospital systems. Tech stack: Python, FastAPI, MongoDB, AWS KMS.
Ecommerce Inventory Sync API
Developed a real-time inventory API connecting Shopify, Amazon, and warehouse system. Cut stock discrepancy from 5% to zero. Tech stack: Node.js, GraphQL, RabbitMQ, DynamoDB.
SaaS Multi-Tenant API Gateway
Created an API gateway with Kong for a B2B SaaS platform serving 500+ tenants. Handled 10M requests/day with 99.9% uptime. Tech stack: Kong, Go, PostgreSQL, Kubernetes.
Real Estate MLS Aggregation API
Built an API that aggregates MLS data from 5 regional providers into a single RESTful endpoint. Reduced data latency from 4 hours to 15 minutes. Tech stack: Node.js, Redis, Elixir.
Logistics Route Optimization API
Developed a WebSocket API for real-time route tracking used by 200+ delivery drivers. Cut average delivery time by 18%. Tech stack: Python, FastAPI, PostgreSQL, Google Maps API.
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 invoices, no scope creep charges.
Full code ownership
You own 100% of the code from day one. We push directly to your repository. No licensing fees, no lock-in, no hidden IP clauses.
Senior engineers only
Our team averages 12 years of experience building APIs at scale. No junior developers, no offshoring. Every engineer writes production code.
Compliance built in
We handle HIPAA, PCI-DSS, and SOC 2 compliance as part of the build. Our APIs include audit logging, encryption at rest, and RBAC by default.
8-12 week delivery
We ship working APIs in 8-12 weeks, not 6 months. Our structured process and senior team keep projects on track. 98% of our projects deliver on time.
Post-launch support
Every project includes 2 weeks of free post-launch support. We help your team deploy updates, fix any issues, and document maintenance procedures.
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.