Best Custom API Development VendorAPI Development
Build APIs that scale. Our senior engineers ship production-ready APIs in 8-12 weeks.
IRPR builds custom APIs for SaaS platforms, fintech apps, and enterprise systems. We use Node.js, Go, Python, and cloud-native stacks on AWS/GCP.
We ship in 8-12 weeks with fixed pricing from $80K. Our APIs meet PCI-DSS, HIPAA, and SOC 2 compliance.
We work with SaaS founders needing API-first products, CTOs migrating to microservices, and product owners integrating third-party services.
Types of software we ship.
RESTful API
Stateless endpoints with JSON payloads. We use Express.js, FastAPI, or Go Gin for high throughput.
GraphQL API
Flexible queries and mutations. Built with Apollo Server or Hasura for real-time data fetching.
Webhook System
Event-driven callbacks for asynchronous integrations. Powered by AWS EventBridge or Kafka.
API Gateway
Single entry point for routing, auth, rate limiting. We use Kong or AWS API Gateway.
Real-Time API (WebSocket)
Persistent connections for live updates. Built with Socket.IO or AWS API Gateway WebSockets.
Third-Party API Integration
Connect Stripe, Salesforce, Twilio, and more. We handle OAuth, rate limits, and data mapping.
Internal Microservice API
Domain-specific services with gRPC or message queues. Designed for scalability and fault isolation.
Public API for Partners
Documented, versioned, and secured with API keys. Includes usage analytics and SDK generation.
We build for every business type.
SaaS Companies
Fintech Apps
Healthcare Systems
Ecommerce Merchants
Enterprise Integration
Why We Are the Best Custom API Development Vendor
Our APIs are built by senior engineers who ship fast and keep costs predictable.
Every custom API we build starts with a two-week Roadmap phase where we define endpoints, data models, and compliance needs. You get a fixed price and timeline before any code is written.
We have shipped APIs for 200+ products across fintech, healthcare, and SaaS. Our uptime SLA of 99.9% and 98% on-time delivery rate prove we deliver reliable integrations.
What Sets the Best Custom API Development Vendor Apart
Generic dev shops overpromise and underdeliver. IRPR ships on time with full documentation.
Many agencies hand off projects to junior developers after the sale. They use unclear pricing with hourly billing that blows budgets.
IRPR assigns senior engineers from day one. We give you a fixed quote in week two and deliver working code every sprint.
- Junior developers after contract signed
- Hourly billing with no cap
- No compliance knowledge (HIPAA, PCI)
- One-size-fits-all stack
- Deliverables hidden in vague timelines
- No post-launch support in contract
- Senior engineers only (10+ years)
- Fixed price from $80K after Roadmap
- HIPAA, PCI-DSS, SOC 2 ready
- Stack tailored: Node.js, Go, Python, AWS
- Two-week Roadmap defines all endpoints
- Two months of free post-launch maintenance
How We Build Your Custom API
Our process eliminates risk with a documented Roadmap before any code.
We start with a two-week Roadmap where we interview stakeholders, map data flows, and choose the right protocol (REST, GraphQL, WebSocket).
Then we build in two-week sprints with continuous deployment. You see working endpoints and can test them in a staging environment.
What Ships When You Hire the Best Custom API Development Vendor
Every project includes deliverables that let your team operate independently.
You get more than just code. We hand over infrastructure-as-code, monitoring dashboards, and a runbook for on-call teams.
All source code is in your GitHub repository from sprint one. There is no vendor lock-in.
- Source code in your private GitHub repo
- CI/CD pipeline (GitHub Actions or GitLab CI)
- Postman collection with all endpoints
- OpenAPI specification (Swagger)
- Sentry error tracking and alerts
- Datadog dashboards for latency and errors
- Deployment scripts (Terraform or CDK)
- Security scan report (OWASP Top 10)
- Runbook for production incidents
- Two months of free post-launch support
What we ship in this practice.
Payment API for Fintech Startup
Built a PCI-DSS compliant payment API that processes 10,000+ transactions daily. Reduced integration time from 6 weeks to 2. Stack: Node.js, PostgreSQL, Stripe Connect.
Patient Data API for Telehealth
Created a HIPAA-compliant API connecting EHR systems with a telehealth platform. Cut patient data retrieval time by 70%. Stack: Go, PostgreSQL, AWS HealthLake.
Real-Time Inventory API for Ecommerce
Designed a WebSocket-based inventory API for a multi-vendor marketplace. Enabled live stock updates across 500+ sellers. Stack: Node.js, Redis, AWS AppSync.
Subscription Billing API for SaaS
Developed a metered billing API handling millions of events per month. Automated revenue recognition and reduced manual invoicing by 20 hours per week. Stack: Python, Django, Stripe.
Property Data API for Real Estate
Built an API aggregating MLS data, tax records, and walkability scores. Used by a national brokerage with 10,000+ agents. Stack: Node.js, Elasticsearch, AWS Lambda.
Learning Analytics API for EdTech
Created a FERPA-compliant API that pushes student performance data to dashboards and parent portals. Handles 1 million requests per day. Stack: Go, TimescaleDB, Apache Kafka.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote after the two-week Roadmap. No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
Our team averages 12+ years of experience. You never get junior developers. Every API is built by engineers who have shipped production systems at scale.
Full ownership of code
You own every line of code from day one. We put it in your GitHub repo immediately. No proprietary frameworks, no licenses to buy.
Compliance built-in
We have built HIPAA, PCI-DSS, and SOC 2 compliant APIs. Our processes include automated security scans and data encryption at rest and in transit.
8-12 week delivery
We ship a working MVP in 8-12 weeks. Our 98% on-time delivery rate comes from strict sprint planning and daily standups with your team.
Post-launch support included
Every project comes with two months of free maintenance. We handle bug fixes, monitoring alerts, and small changes so your team can ramp up.
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.