Senior Custom API Development VendorAPI Development
We build production-grade APIs for 8-12 weeks at a fixed price. Your API ships with full documentation, security audits, and 99.9% uptime.
IRPR is a senior custom API development vendor. We build REST, GraphQL, and gRPC APIs using Node.js, Go, Python, and AWS Lambda. Every API goes through OWASP security checks and includes OpenAPI documentation.
Your API ships in 8-12 weeks at a fixed price of $80,000 to $250,000. We handle compliance for HIPAA, PCI-DSS, and SOC 2. The code is yours from day one with a CI/CD pipeline on GitHub Actions.
CTOs at healthcare companies hire us to replace legacy SOAP APIs with FHIR. Fintech startups need PCI-compliant payment APIs. Enterprise SaaS teams require custom integration APIs with Salesforce. Fast-growing logistics companies want high-throughput data APIs.
Types of software we ship.
REST API
Standard RESTful API with JSON responses, rate limiting, and versioning. Built with Express.js and PostgreSQL. Includes Swagger docs.
GraphQL API
GraphQL API with Apollo Server and a single endpoint. Supports subscriptions and complex queries. Ideal for data-heavy dashboards.
gRPC API
gRPC API using Protocol Buffers for microservices. Low latency, streaming support, and server-side load balancing with Envoy proxy.
WebSocket API
Real-time WebSocket API for live notifications and chat. Uses Socket.IO on Node.js with Redis for horizontal scaling.
Event-Driven API
Event-driven API with Apache Kafka event streams. Supports pub/sub patterns, event sourcing, and CQRS for audit trails.
Payment API
PCI-compliant payment API integrated with Stripe, Braintree, or Adyen. Handles tokenization, recurring billing, and 3D Secure.
Healthcare API (FHIR)
HIPAA-compliant FHIR API for EHR integration. Uses HAPI FHIR on Azure. Supports SMART on FHIR apps and OAuth 2.0.
Data Aggregation API
Data aggregation API that joins multiple sources. Built with AWS Lambda and DynamoDB. Includes caching via Redis and rate limiting.
We build for every business type.
Industries
Use Cases
Company Sizes
Compliance Standards
Tech Stacks
Why hire a senior custom API development vendor
Most development shops hand your API to a junior engineer. IRPR assigns senior engineers only, each with 7+ years of experience. They have shipped APIs for healthcare, fintech, and enterprise SaaS.
You get a senior team that writes production-ready code from the first sprint. They use OpenAPI specs, automated testing, and CI/CD pipelines. No handoffs, no wasted cycles.
The difference between generic dev shops and IRPR
Not all API development vendors deliver the same result. Here is what sets IRPR apart.
Generic shops start coding without a detailed specification. They charge by the hour and the scope creeps. You end up with undocumented endpoints and no security audit.
IRPR starts with a 2-week Roadmap phase. We write every endpoint, data model, and error code. You get a fixed price and a clear timeline before one line of code is written.
- Vague requirements, no spec
- Hourly billing, unpredictable cost
- Junior developer assigned
- No OpenAPI documentation
- No automated tests or CI/CD
- No security audit
- Detailed spec from Roadmap phase
- Fixed price, no surprise invoices
- Senior engineers with 7+ years
- OpenAPI docs generated from code
- CI/CD pipeline on GitHub Actions
- OWASP security audit included
Our 4-phase process for building your custom API
We follow a repeatable process that eliminates guesswork. Each phase has a clear deliverable.
Every project goes through Idea, Roadmap, Product, and Release. The Roadmap phase costs $8,500 and locks your scope and price. After that, no changes, no delays.
The Product phase runs 6-10 weeks. We build and ship working endpoints every week. You see progress in a staging environment and give feedback each sprint.
Everything that ships with your custom API
You own every line of code. We ship a complete system, not just endpoints.
We do not hand over a ZIP file and walk away. You get production infrastructure, monitoring, and documentation. Everything is ready for your team to maintain.
Our standard package includes 8-12 week build, 2-week support, and a knowledge transfer session. After that, you can extend or modify the API yourself.
- Source code in your private GitHub repo
- OpenAPI 3.0 specification
- CI/CD pipeline on GitHub Actions with automated tests
- Infrastructure as Code (Terraform or Pulumi)
- Monitoring dashboards on Datadog (uptime, latency, error rates)
- Error tracking with Sentry
- Load testing report (k6 or Artillery)
- OWASP security audit report
- Deployment playbook with runbooks
- 2 weeks of post-release support
What we ship in this practice.
Payment Processing API for Fintech Startup
Built a PCI-DSS compliant payment API using Node.js and Stripe. Reduced transaction failure rate by 40% and cut chargeback disputes by 8 hours per week. Industry: fintech.
FHIR API for Regional Health Network
Developed a HIPAA-compliant FHIR API on Azure with HAPI FHIR. Enabled real-time patient data exchange between 3 EHR systems. Reduced lab result delivery from 24 hours to 3 minutes.
Real-time Tracking API for Logistics Company
Built a WebSocket API with Socket.IO and Redis for live GPS tracking. Handled 10,000 concurrent connections. Improved delivery ETA accuracy from +/- 30 minutes to +/- 2 minutes.
Integration API for SaaS CRM Platform
Created a GraphQL API to sync data between Salesforce and a custom CRM. Used Apollo Server and PostgreSQL. Eliminated manual data entry, saving each user 5 hours per week.
Data Aggregation API for Ecommerce Marketplace
Designed a REST API aggregating inventory from 50+ suppliers. Used AWS Lambda and DynamoDB with Redis caching. Reduced product sync time from 6 hours to 12 minutes.
IoT Sensor API for Manufacturing Plant
Built a gRPC API using Go and Envoy for machine sensor data. Achieved 1ms latency on 99% of requests. Reduced unplanned downtime by 30% through real-time alerts.
Why teams hire us.
Fixed price, not hourly
Every project gets a fixed quote in 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, no juniors
We assign engineers with 7+ years of experience. They have built APIs for HIPAA, PCI, and SOC 2 environments. No junior devs, no training curve, no guesswork.
Compliance built into the process
We audit every API against OWASP Top 10, HIPAA privacy rules, and PCI-DSS requirements. Compliance is not an afterthought. We include the security report with the delivery.
8-12 week delivery
Our 4-phase process delivers a production-ready API in 8 to 12 weeks. The Roadmap phase locks scope and timeline before coding starts. You get a firm delivery date.
Full code ownership from day one
You own the source code, the infrastructure code, and the documentation. No licensing fees, no lock-in, no recurring royalties. The code is yours to modify.
No vendor lock-in with specific tools
We use standard open-source tools: Node.js, Go, Python, PostgreSQL, Redis. Your team can maintain the API without needing IRPR. We document everything for handoff.
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.