Senior Custom API Development ConsultantsAPI Development
We build secure, scalable APIs for your product. You get a dedicated senior team, fixed price, and code ownership in 12 weeks.
IRPR builds custom APIs for startups and enterprises. We use Node.js, Python, Go, GraphQL, REST, and PostgreSQL to design APIs that handle millions of requests per day. Every API includes automated testing, rate limiting, and monitoring from day one.
We ship a production-ready API in 8-12 weeks. Pricing is fixed at $80K-$250K depending on complexity and integrations. All APIs meet HIPAA, PCI-DSS, or SOC 2 compliance requirements if needed. You get full source code and a CI/CD pipeline.
We work with CTOs who need a secure data layer for their SaaS product, product managers integrating third-party services like Stripe or Salesforce, and founders launching a mobile app that needs a custom backend. You hire senior engineers, not a junior team.
Types of software we ship.
REST API
Stateless, resource-based APIs using HTTP methods. Built with Express.js or FastAPI. Ideal for mobile apps and web services.
GraphQL API
Flexible query language for complex data requests. Uses Apollo or Hasura. Reduces over-fetching and under-fetching.
Webhook System
Real-time event-driven APIs that push data to external services. Built with Node.js or Python. Integrates with Slack, Stripe, or Zapier.
Third-Party API Integration
Connect your product to Salesforce, HubSpot, QuickBooks, or custom endpoints. Includes authentication, error handling, and rate limit management.
Microservices API Gateway
Central entry point for multiple microservices. Uses Kong or AWS API Gateway. Handles authentication, routing, and throttling.
Internal API for SaaS
Private APIs for internal tools and data pipelines. Built with gRPC or RabbitMQ. Ensures low latency and high throughput.
Public API for Developers
Developer-facing APIs with documentation, SDKs, and versioning. Includes Swagger/OpenAPI specs and API key management.
Data Sync API
Real-time or batch data synchronization between systems. Uses Apache Kafka or AWS Kinesis. Supports conflict resolution and audit logs.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics
Why Senior Custom API Development Consultants Matter
A poorly designed API costs you time, money, and customer trust.
We have shipped 200+ APIs across 50+ countries. Our engineers average 10 years of experience. We design APIs that scale to 1 million requests per day with 99.9% uptime. Every API includes authentication, rate limiting, and monitoring from day one.
We use tools like Postman for testing, Sentry for error tracking, and Datadog for performance monitoring. Our APIs are built with Node.js, Python, or Go and deploy on AWS, GCP, or Azure. You get a documented, versioned API that your team can maintain.
How IRPR Compares to Generic Dev Shops
Not all API consultants deliver the same quality. Here is the difference.
Generic shops often assign junior developers who learn on your project. They use hourly billing and stretch timelines. You end up with undocumented endpoints, no tests, and a fragile system.
IRPR assigns senior engineers only. We use a fixed price model. Your API ships with full documentation, automated tests, and a CI/CD pipeline. You own the code from day one.
- Junior developers with 2-3 years experience
- Hourly billing with no cap
- No compliance knowledge (HIPAA, PCI-DSS)
- APIs with no rate limiting or monitoring
- No documentation or versioning
- Timelines stretch 6-12 months
- Senior engineers with 10+ years experience
- Fixed price from $80K to $250K
- HIPAA, PCI-DSS, SOC 2 compliance built in
- Rate limiting, authentication, monitoring included
- OpenAPI/Swagger docs and versioned endpoints
- 8-12 week delivery, on time 98% of projects
Our API Development Process in 4 Phases
We follow a clear, repeatable process to deliver your API on time and on budget.
Every project starts with a discovery call. We map your data model, endpoints, and integrations. Then we build, test, and deploy. You see progress every week.
We use agile sprints with daily standups and weekly demos. You review and approve each milestone. No surprises.
What Ships with Every API Project
Every API we build comes with these deliverables. No hidden extras.
We believe in complete transparency. You get everything you need to run and maintain your API. No black boxes.
Our delivery includes source code, infrastructure configs, and documentation. Your team can take over immediately or we can continue support.
- Full source code in your private GitHub repo
- CI/CD pipeline on GitHub Actions or GitLab CI
- API documentation via Swagger/OpenAPI
- Authentication (JWT, OAuth2, or API keys)
- Rate limiting and throttling configuration
- Error tracking with Sentry
- Performance monitoring with Datadog
- Postman collection for testing
- Deployment scripts for AWS, GCP, or Azure
- 1 hour of post-launch support per week for 4 weeks
What we ship in this practice.
Patient Data API for Telehealth Startup
Built a HIPAA-compliant REST API for a telehealth platform handling 50,000 patient records. Used Node.js, PostgreSQL, and AWS. Reduced data access time by 60%. Achieved SOC 2 Type II certification.
Payment Processing API for Fintech App
Developed a PCI-DSS compliant payment API integrating Stripe and Plaid. Handles 10,000 transactions per day. Reduced payment failure rate from 8% to 2%. Built with Python and FastAPI.
Product Catalog API for Ecommerce Brand
Created a GraphQL API for a multi-vendor marketplace with 500,000 SKUs. Used Apollo Server and MongoDB. Improved search response time from 2 seconds to 200ms.
Subscription Billing API for SaaS Platform
Built a billing API with Stripe integration for a SaaS company serving 5,000 customers. Automated invoice generation and dunning. Reduced manual billing work by 15 hours per week.
Real-Time Tracking API for Logistics Firm
Developed a real-time tracking API using WebSockets and Kafka. Handles 1 million location updates per day. Reduced delivery delays by 25%. Built with Go and Redis.
Content Delivery API for Media Platform
Designed a video streaming API with adaptive bitrate support. Used AWS CloudFront and Lambda. Serves 100,000 concurrent viewers with 99.9% uptime. Built with Node.js and S3.
Why teams hire us.
Senior engineers only
Every consultant has 10+ years of experience building APIs. No junior developers. You get a team that has shipped APIs for healthcare, fintech, and ecommerce.
Fixed price, no hourly billing
You get a fixed price quote after the Roadmap phase (week 2). No surprise invoices. Typical projects range from $80K to $250K depending on complexity.
Compliance built in
We build APIs that meet HIPAA, PCI-DSS, and SOC 2 standards. We include audit logs, encryption at rest and in transit, and access controls by default.
Full code ownership
You own every line of code. We hand over source code, deployment scripts, and documentation. No lock-in. No recurring fees.
8-12 week delivery
We ship production-ready APIs in 8-12 weeks. 98% of our projects deliver on time. You see working endpoints every week.
Global team, your time zone
Our team works async-first with overlap hours in US time zones (EST, CST, PST). We have delivered APIs for clients in 50+ countries.
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.