Senior REST API Development ConsultantsDevelopment Consultants
We build production-grade REST APIs for SaaS platforms and enterprise systems. 8-12 week delivery with fixed pricing and full code ownership.
IRPR provides senior REST API development consultants who design and build APIs using Node.js, Express, Python FastAPI, Go, and .NET Core. Every API follows OpenAPI 3.0 specs and includes automated testing with Postman and Jest.
We ship a production-ready REST API in 8-12 weeks with a fixed price of $80K-$250K. All APIs are compliant with HIPAA, PCI-DSS, and SOC 2. You own the source code from day one.
Our clients include CTOs at Series A-B startups needing a scalable API backend, product managers at healthcare companies requiring HIPAA-compliant FHIR APIs, and engineering directors at fintech firms building PCI-DSS compliant payment APIs.
Types of software we ship.
REST API for SaaS Platforms
Multi-tenant REST APIs with JWT auth, rate limiting, and usage metering. Built on Node.js and PostgreSQL.
Payment Gateway API
PCI-DSS compliant REST APIs integrating Stripe, Braintree, or Adyen. Includes webhook handling and idempotency keys.
Healthcare FHIR API
HIPAA-compliant REST APIs for EHR integration, patient data exchange, and clinical workflows using FHIR R4.
Ecommerce Product & Order API
REST APIs for product catalogs, cart management, order processing, and inventory sync with Shopify or Magento.
Real-Time Data Streaming API
REST endpoints combined with WebSockets for live dashboards, IoT data ingestion, and event-driven architectures.
Internal Microservices API
RESTful microservices with Docker, Kubernetes, and API gateways for enterprise backend decoupling.
Third-Party Integration API
REST APIs that wrap legacy systems or external services (Salesforce, HubSpot, SAP) with consistent interfaces.
Public Developer API
Documented, versioned REST APIs with developer portals, API keys, usage analytics, and SDK generation.
We build for every business type.
SaaS & Technology
Healthcare
Fintech & Payments
Ecommerce & Retail
Media & Content
Why hire senior REST API development consultants
Building a production API requires more than writing endpoints. It demands architecture decisions that scale to millions of requests.
Our senior REST API development consultants have shipped over 200 APIs across 50 countries. We use OpenAPI 3.0 for spec-first design, ensuring every endpoint is documented, versioned, and testable from day one. We enforce idempotency, rate limiting, and proper error handling with structured error responses.
Each API includes automated load testing with k6, security scanning with OWASP ZAP, and continuous deployment via GitHub Actions. We deploy on AWS ECS or Kubernetes with auto-scaling. Your API ships with a Postman collection and a developer-friendly README.
Senior REST API development consultants vs generic dev shops
Not all API teams are equal. Here is how IRPR compares to a generic development shop.
Generic shops often treat API development as a side task. They skip spec-first design, omit rate limiting, and deliver undocumented endpoints. You end up with a fragile API that breaks under load and takes months to fix.
IRPR treats API development as a core engineering discipline. Every API starts with an OpenAPI spec, includes automated tests, and ships with monitoring and alerting. We guarantee 99.9% uptime and provide a 12-month warranty on all production APIs.
- No OpenAPI spec
- No rate limiting
- No automated tests
- No monitoring
- Hourly billing
- No compliance support
- OpenAPI 3.0 spec-first
- Rate limiting + caching
- Postman + Jest tests
- Sentry + Datadog monitoring
- Fixed price from $80K
- HIPAA, PCI-DSS, SOC 2
How we build your REST API in 4 phases
Our process is designed to de-risk API development and deliver predictable results.
Phase 1 is a 2-week Roadmap where we define the API spec, data model, and deployment architecture. You get a fixed-price contract and a detailed project plan. Phase 2 is a 6-8 week build sprint where we code, test, and deploy the API incrementally.
Phase 3 is a 1-week Release where we run load tests, security audits, and documentation finalization. Phase 4 is a 12-month warranty with monitoring and hotfix support. Every phase includes weekly demos and a shared Slack channel.
What ships with your REST API
Every API project includes a complete delivery package. No missing pieces.
You get more than just code. We deliver a production-ready API with documentation, tests, monitoring, and deployment pipelines. Everything is in your repository from day one.
Our senior REST API development consultants ensure you can maintain and extend the API after launch. We include a developer onboarding session and a handoff document.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification (YAML/JSON)
- Postman collection with example requests
- CI/CD pipeline on GitHub Actions
- Automated tests (unit, integration, load)
- Sentry error tracking
- Datadog monitoring dashboard
- Docker Compose for local development
- Deployment guide and architecture diagram
- 12-month warranty with priority support
What we ship in this practice.
Patient Data API for Telemedicine Platform
Built a HIPAA-compliant REST API for a telemedicine startup. The API handles 50K patient records, supports FHIR R4 data exchange, and integrates with Epic EHR. Reduced patient data retrieval time by 60%. Tech stack: Node.js, Express, PostgreSQL, AWS ECS.
Payment Processing API for Fintech SaaS
Designed a PCI-DSS Level 1 compliant REST API for a B2B payment platform. The API processes $2M in monthly transactions with Stripe and Plaid. Achieved 99.99% uptime over 12 months. Tech stack: Python FastAPI, Redis, Stripe, Kubernetes.
Product & Order API for Ecommerce Marketplace
Developed a REST API for a multi-vendor marketplace handling 500K products. The API syncs inventory across Shopify and WooCommerce, reducing manual data entry by 8 hours per week. Tech stack: Node.js, MongoDB, Elasticsearch, AWS Lambda.
Real-Time Analytics API for SaaS Platform
Built a REST API with WebSocket streaming for a real-time analytics dashboard. The API ingests 10K events per second and serves 200 concurrent users. Reduced dashboard load time from 8 seconds to under 1 second. Tech stack: Go, TimescaleDB, Kafka, Docker.
MLS Data API for Real Estate Platform
Created a REST API that aggregates MLS data from 50+ sources for a real estate search platform. The API returns property listings with images and tax history in under 200ms. Tech stack: Node.js, PostgreSQL, Redis, AWS CloudFront.
Student Records API for EdTech Platform
Built a FERPA-compliant REST API for a K-12 learning management system. The API manages 100K student records and integrates with Google Classroom and Canvas. Reduced data sync time from 4 hours to 15 minutes. Tech stack: Python Django, PostgreSQL, Celery, AWS RDS.
Why teams hire us.
Fixed price, not hourly
Every API project gets a fixed quote in the Roadmap phase (week 2). No hourly billing, no surprise invoices, no scope creep charges. You know the cost before we write a single line of code.
Senior engineers only
Every consultant on your project has 8+ years of API development experience. We do not outsource to juniors or offshore teams. Your API is built by engineers who have shipped production APIs at scale.
OpenAPI spec-first design
We write the OpenAPI 3.0 spec before any code. This gives you a complete contract for your API, including request/response schemas, error codes, and authentication. No surprises during integration.
Compliance built in
We build HIPAA, PCI-DSS, and SOC 2 compliance into the API architecture from day one. This includes audit logging, encryption at rest and in transit, and role-based access control. No retrofitting.
Full code ownership
You own all source code, documentation, and infrastructure config from the first commit. No licensing fees, no vendor lock-in. Your API runs in your AWS or GCP account.
12-month warranty
After launch, we monitor your API with Datadog and Sentry, fix bugs within 24 hours, and provide priority support for 12 months. No additional retainer required.
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.