Professional REST API Development AgencyREST API
We build custom REST APIs that power your business. Our senior engineers deliver production-ready APIs in 8-12 weeks with fixed pricing.
IRPR is a professional REST API development agency. We build custom REST APIs using Node.js, Python, and Go, with OpenAPI/Swagger specs drafted before the first line of code. Our APIs handle authentication, rate limiting, and pagination out of the box.
Each project ships in 8-12 weeks with fixed pricing from $60,000 to $180,000. We deliver source code, CI/CD pipelines, and monitoring dashboards. HIPAA, PCI-DSS, and SOC 2 compliance are available for regulated industries.
We work with CTOs launching SaaS platforms, product managers integrating third-party services, engineering leads scaling microservices, and founders building API-first products. Every engagement uses senior engineers only.
Types of software we ship.
Public REST API for Third-Party Developers
Ship a developer-facing API with documentation, SDKs, and key management. Used by Stripe, Twilio, and Shopify. We build with Express.js and Kong gateway.
Internal REST API for Microservices
Connect backend services with a consistent API layer. Uses FastAPI or Go Gin with gRPC fallback. We include service discovery and circuit breakers.
REST API for Mobile Apps Backend
Power iOS and Android apps with a robust REST API. Supports push notifications, file uploads, and offline sync. Built with Node.js and PostgreSQL.
REST API for Ecommerce Integration
Sync orders, inventory, and customers between Shopify, WooCommerce, and ERP systems. We use Celery for background jobs and Redis for caching.
REST API for Data Synchronization
Real-time data sync between databases and SaaS tools. Built on Apache Kafka and Debezium. Handles CDC (change data capture) with no data loss.
REST API for Payment Processing
Abstract multiple payment gateways (Stripe, PayPal, Adyen) into one REST API. Includes idempotency keys, webhook handling, and PCI-compliant tokenization.
REST API for CRM Integration
Unify customer data across Salesforce, HubSpot, and custom apps. We use MuleSoft Anypoint Platform and custom connectors with OAuth 2.0 flow.
REST API for IoT Devices
Handle device telemetry, commands, and firmware updates via REST. Uses MQTT bridge and AWS IoT Core. Supports thousands of concurrent connections.
We build for every business type.
SaaS Platforms
Ecommerce
Enterprise
Healthcare
Fintech
Why choose a professional REST API development agency
A custom REST API built by IRPR gives you control, security, and scalability from day one.
We have shipped over 200 custom REST APIs for clients in 50+ countries. Our APIs handle millions of requests per day with 99.9% uptime. Every API includes monitoring via Datadog and error tracking via Sentry.
Our fixed pricing model means no surprises. You know the cost before we start building. The average REST API project runs $60K-$180K and takes 12 weeks. All code is yours and hosted on your own cloud accounts.
Generic agency vs professional REST API development agency
Most dev shops produce fragile APIs that break under load. IRPR builds APIs that scale from day one.
We have seen clients come to us after hiring a generic agency. The APIs had no rate limiting, no proper error handling, and no documentation. Rewriting them cost more than building from scratch.
IRPR writes OpenAPI specs before coding. Every endpoint is documented, typed, and tested. We use Postman collections for integration tests and run them in CI. The result is an API you can ship to customers immediately.
- No OpenAPI specification before coding
- No rate limiting or throttling
- No automated tests for endpoints
- No monitoring or alerting
- No versioning strategy
- No pagination or filtering patterns
- OpenAPI 3.0 spec written and agreed before coding
- Rate limiting with token bucket algorithm
- Automated integration tests in CI pipeline
- Datadog dashboards and PagerDuty alerts
- Semantic versioning with deprecation headers
- Cursor-based pagination and sort/filter by design
Our REST API development process
We follow a four-phase approach to deliver production-ready APIs in 8-12 weeks.
Every project starts with a two-week Roadmap phase. We map endpoints, data models, and integrations. You approve the spec before we write code.
After the Roadmap, we build in two-week sprints. You see working endpoints every 14 days. Deployments go to staging first. We ship to production after your sign-off.
What ships with every professional REST API project
You get more than code. Every delivery includes documentation, infrastructure, and monitoring.
We believe in shipping a complete system, not just endpoints. Every REST API project from IRPR includes the items below. No hidden extras, no 'phase two' surprises.
The code is hosted in your own GitHub repo from day one. You own the intellectual property. We grant you full administrative access to all cloud services.
- OpenAPI 3.0 specification document
- Source code in your private GitHub repository
- CI/CD pipeline with GitHub Actions
- Postman collection with example requests
- Rate limiting and authentication middleware
- Datadog monitoring and PagerDuty alerting
- Sentry error tracking integration
- Load test results with k6
- Deployment playbook and environment setup
- Admin access to AWS/GCP/Azure account
What we ship in this practice.
Payment Gateway REST API
Built a PCI-compliant API for a fintech startup that processed $2M in transactions within the first month. Stack: Node.js, Express, Stripe Connect, PostgreSQL. Reduced payment failures by 40%.
Patient Data REST API for Telemedicine
Developed a HIPAA-compliant REST API for a telemedicine platform handling 10,000 appointments per month. Stack: FastAPI, PostgreSQL, AWS HealthLake. Eliminated manual data entry saving 20 hours/week for staff.
Inventory Sync REST API for Ecommerce
Created a real-time inventory sync API between Shopify and a warehouse management system for a multi-brand retailer. Stack: Python, Celery, Redis, Shopify REST API. Reduced overselling by 100%.
Multi-Tenant REST API for SaaS CRM
Built a multi-tenant CRM API for a B2B SaaS company serving 500+ customers. Stack: Node.js, Express, MongoDB, Auth0. Cut onboarding time from 3 weeks to 2 days.
Real Estate Listings REST API
Developed a listing sync REST API for a real estate platform integrating MLS, Zillow, and custom data. Stack: Go, Gin, PostgreSQL, RabbitMQ. Reduced data latency from 24 hours to 15 minutes.
Learning Management REST API for EdTech
Created a FERPA-compliant REST API for an online learning platform serving 200 schools. Stack: FastAPI, PostgreSQL, AWS S3. Enabled automated grade syncing, saving teachers 5 hours per week.
Why teams hire us.
Fixed price, not hourly
Every professional REST API project gets a fixed quote after the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. The price you see is the price you pay.
Senior engineers only
We do not use junior or offshore developers. Every engineer has 8+ years of experience and a strong background in API design. You work directly with the team building your API.
OpenAPI by default
We write the OpenAPI 3.0 spec before writing code. Your frontend and integration teams can start working against the spec immediately. No guesswork, no misaligned expectations.
Compliance ready
We build REST APIs that pass HIPAA, PCI-DSS, and SOC 2 audits. We handle encryption at rest (AES-256) and in transit (TLS 1.2+), audit logging, and access controls out of the box.
8-12 week delivery
Most REST APIs ship in 8 to 12 weeks. We break the project into two-week sprints with demos at the end of each sprint. You see progress every 14 days.
Full source code ownership
You own every line of code we write. We never license software back to you or charge recurring fees for the API. The code is in your repository from day one.
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.