Best REST API Development ServicesREST API
We build production-ready REST APIs that handle millions of requests per day. Get a fixed price API in 8-12 weeks with full documentation and support.
IRPR builds high-performance REST APIs using Node.js with Express, Python with FastAPI, or Go with Chi. We design each API with clear endpoints, versioned routes, and OpenAPI 3.0 specs so your frontend and mobile clients have no surprises.
Every project ships with source code, automated CI/CD pipelines, load tests, and Postman collections. Timeline is 8-12 weeks for a production-grade API. Pricing is fixed per scope, starting at $80K and going up to $250K for complex integrations or compliance.
Founders hire us to build their core product API before a seed round. Enterprise teams bring us in to modernize legacy REST endpoints. Product managers need scalable backends for SaaS apps. All expect a reliable, documented API that just works.
Types of software we ship.
Payment Processing API
Builds endpoints for Stripe, PayPal, or Adyen integration. Handles subscriptions, refunds, and webhook reconciliation.
Social Media API
Handles posts, likes, comments, and user feeds with pagination and caching. Uses Redis for real-time activity streams.
Ecommerce Product API
Serves product catalog, inventory, and pricing data with full-text search via Elasticsearch for fast lookups.
Healthcare FHIR API
Implements HIPAA-compliant endpoints for patient records, appointments, and lab results. Uses SMART on FHIR for auth.
Geolocation API
Serves address validation, distance calculations, and reverse geocoding. Integrates Google Maps or Mapbox tile services.
Messaging API
Handles SMS, push notifications, and in-app chat via WebSockets. Powered by Twilio and Pusher for delivery receipts.
Data Integration API
Syncs data between Salesforce, HubSpot, and internal databases with idempotent retries and audit logs.
Content Management API
Manages articles, media, and taxonomies with role-based access. Connects to a headless CMS like Strapi or Contentful.
We build for every business type.
fintech companies
healthcare organizations
ecommerce brands
saas companies
logistics providers
Why IRPR is the best for REST API development
We ship more than code. Every API comes with documentation, tests, and monitoring.
IRPR has built over 200 REST APIs for clients in 50 countries. Our average delivery is 12 weeks from kickoff to production. We use OpenAPI 3.0 for every endpoint so your frontend team can start mocking immediately.
Our APIs handle 10,000 requests per second with 99.9% uptime guaranteed. We include Postman collections, load test reports, and Sentry error tracking in every project. No open tickets at launch.
Generic agencies vs IRPR
Not all API teams deliver the same quality. Here is what you actually get.
Most API development shops write code and hand it over with no documentation or tests. You pay hourly, delays pile up, and you spend months fixing issues yourself.
IRPR treats your API like a product. We design endpoints with your frontend and mobile clients in mind, write automated integration tests, and ship a complete developer experience.
- No API specification upfront
- Hourly billing with no cap
- Delivered without tests
- No Postman collection
- No CI/CD pipeline
- No post-launch monitoring
- OpenAPI 3.0 spec before coding
- Fixed price per scope
- Automated integration test suite
- Postman collection included
- GitHub Actions CI/CD pipeline
- Sentry + Datadog monitoring setup
How we build your REST API
A repeatable 4-phase process that eliminates surprises.
Every API project starts with an Idea phase where we define endpoints, data models, and auth strategies. We produce a full OpenAPI 3.0 specification before writing a single line of code.
Development runs in 2-week sprints with live demos. You see working endpoints every sprint. We deploy to a staging environment with load tests before production cutover.
What ships with every API
You get a complete developer experience, not just code.
Every IRPR API project includes everything your team needs to integrate and maintain the service. No missing pieces, no 'we will do that later'.
We treat documentation and tooling as first-class deliverables. Your frontend developers will thank you.
- Source code in your repo
- OpenAPI 3.0 specification (YAML/JSON)
- Postman collection with example requests
- CI/CD pipeline via GitHub Actions
- Automated integration test suite
- Load test report (k6 or Artillery)
- Sentry error tracking configured
- Datadog or Prometheus monitoring dashboard
- API documentation hosted (Stoplight or Redoc)
- Deployment runbook and incident response plan
What we ship in this practice.
Real-Time Payment Processing API
Built a Stripe-backed API that processes 500 transactions per minute with idempotency keys and webhook retries. Reduced chargeback disputes by 40%. Tech: Node.js, Express, PostgreSQL, Stripe Connect.
Patient Data Exchange API
Developed a HIPAA-compliant FHIR API for a telemedicine startup. Handles 50,000 patient records with SMART on FHIR auth. Cut data entry time by 8 hours per week per clinic. Tech: Python, FastAPI, PostgreSQL, Auth0.
Multi-Vendor Product API
Created a unified product catalog API for an ecommerce marketplace serving 200 vendors. Supports real-time inventory syncing via Elasticsearch. Search latency under 50ms. Tech: Go, Chi, Redis, Elasticsearch.
SaaS User Management API
Designed a role-based API for a project management SaaS with 10,000 active users. Includes JWT tokens, team invite flows, and audit logs. Saved the internal team 6 weeks of backend work. Tech: Node.js, Express, MongoDB, SendGrid.
Logistics Tracking API
Built a real-time shipment tracking API that aggregates data from 5 carriers (FedEx, UPS, DHL, USPS, TForce). Provides estimated delivery windows with 95% accuracy. Tech: Python, FastAPI, PostgreSQL, Celery.
Media Content API
Developed a video streaming API for a media platform serving 2 million monthly viewers. Handles adaptive bitrate transcoding and CDN delivery. Tech: Node.js, Express, S3, CloudFront, FFmpeg.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote during the Idea phase (week 1). No surprise invoices, no creeping scope. You know the exact cost before we build.
Senior engineers only
Our team averages 12+ years of experience. Every API is designed by a senior backend engineer who has shipped production systems at scale.
Full documentation included
We ship OpenAPI 3.0 specs, Postman collections, and hosted docs. Your frontend team can start integrating the same day we deploy.
Compliance built in
We handle HIPAA, PCI DSS, SOC 2, and FERPA requirements during development. No after-the-fact audits. Encryption, logging, and access controls are standard.
CI/CD and monitoring out of the box
Your API ships with GitHub Actions CI/CD, Sentry error tracking, and Datadog dashboards. We monitor uptime and alert when error rates exceed 0.1%.
You own the full code
Every line of code, every configuration file, and the OpenAPI spec belong to you. No licenses, no locked-in infrastructure. You can take it anywhere.
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.