Experienced Custom API Development PartnerAPI Development
Build secure, scalable APIs with a team that has shipped 200+ integrations. We deliver production-ready APIs in 8-12 weeks with fixed pricing.
IRPR builds custom APIs using Node.js, Python (FastAPI), .NET, and Go. We design REST, GraphQL, and gRPC endpoints that handle 10,000+ requests per second with sub-50ms latency. Every API includes OpenAPI documentation and automated load testing.
Our engagements run 8-12 weeks for a production-ready MVP, with fixed pricing between $80K and $250K. We support SOC 2 Type II, HIPAA, PCI-DSS, and GDPR compliance out of the box. Post-launch we provide 99.9% uptime SLAs on AWS or GCP.
Typical buyers include CTOs scaling their platform, VP of Engineering replacing legacy integrations, Product Managers launching API-first products, and Tech Leads who need a dedicated team for a complex data pipeline.
Types of software we ship.
REST API Development
Stateless HTTP APIs with JSON payloads. We use Express, FastAPI, or ASP.NET Core with PostgreSQL and Redis caching.
GraphQL API Development
Single endpoint schemas with Apollo Server or Hasura. Includes query optimization, batching, and real-time subscriptions.
gRPC API Development
High-performance RPC with Protocol Buffers. Used for internal microservices communication with 10x throughput over REST.
WebSocket API Development
Real-time bidirectional communication using Socket.IO or WebSocket API. Supports chat, live dashboards, and streaming data.
SOAP API Development
XML-based enterprise APIs with WSDL contracts. We integrate with legacy systems like SAP or Salesforce.
Microservices API Gateway
Central gateway using Kong or AWS API Gateway. Handles auth, rate limiting, and routing to 20+ internal services.
Third-Party API Integration
Connect your system with Stripe, HubSpot, Shopify, Salesforce, or 200+ other providers. Includes retry logic and webhook handling.
Custom API SDK Development
Generate client SDKs in Python, JavaScript, Java, and Swift using OpenAPI Generator. Ships with sample code and error handling.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics & Travel
Why You Need an Experienced Custom API Development Partner
Building a custom API in-house often takes 6+ months and misses security, scalability, and documentation requirements.
IRPR has delivered over 200 API projects across 10 industries. We start with a 2-week Roadmap phase where we define endpoints, data models, and deployment architecture. This phase costs $5K-$15K and is applied to the fixed price.
Our APIs are built with automated CI/CD pipelines using GitHub Actions and AWS CodePipeline. Every endpoint gets unit tests, integration tests, and performance benchmarks. We ship OpenAPI 3.0 docs and Postman collections by default.
The Difference Between a Generic Dev Shop and IRPR
Many agencies say they build APIs but ship spaghetti code without documentation or tests.
We make every API production-ready from day one. Our teams include a dedicated QA engineer and a DevOps specialist. You get a documented, scalable API that meets your exact compliance needs.
IRPR's fixed pricing means no hourly surprises. We quote the entire project after the Roadmap phase. Most clients launch in 8-12 weeks and own the full codebase.
- No formal API design review
- Code without unit tests or CI/CD
- Delayed by 3-6 months on average
- Hourly billing with scope creep
- No compliance documentation
- Handoff without Postman or OpenAPI specs
- 2-week Roadmap with endpoint spec
- Automated tests, CI/CD, code coverage >80%
- Fixed timeline: 8-12 weeks MVP
- Fixed price from Roadmap phase onward
- Built-in SOC 2, HIPAA, PCI-DSS compliance
- Ship OpenAPI 3.0 docs and Postman collections
Our API Development Process: From Idea to Production
We move fast without cutting corners. Every phase has clear deliverables and client sign-offs.
The process starts with a discovery call where we learn your data sources, integrations, and performance goals. Within the first week we draft a technical proposal.
Once approved, our engineering team works in 2-week sprints. You see progress every sprint in a shared demo environment.
What Ships with Every Custom API Project
Everything you need to run, scale, and maintain your API without hiring a dedicated team.
We treat your API as a product, not a one-time handoff. Every project includes production-grade infrastructure and monitoring.
Our default stack uses AWS ECS or GCP Cloud Run for compute, RDS for databases, and ElastiCache for caching. We also set up Datadog or New Relic for observability.
- Source code in your private GitHub/GitLab repository
- CI/CD pipeline on GitHub Actions with test and deploy stages
- OpenAPI 3.0 specification (Swagger UI included)
- Postman collection with example requests and environments
- Docker containers for local and production environments
- Terraform or CloudFormation IaC scripts for infrastructure
- CloudWatch / Datadog dashboards for API health and latency
- Sentry error tracking with alerting on 4xx and 5xx errors
- Load test report from k6 or Artillery (requests per second, p99 latency)
- Post-launch support and 90-day warranty on production issues
What we ship in this practice.
Healthcare FHIR API for Telemedicine Platform
Built a HIPAA-compliant FHIR API to connect 500+ clinics. Reduced patient data access time from 30 seconds to under 200ms. Stack: FastAPI, PostgreSQL, AWS Fargate.
Real-Time Payment Gateway API for Fintech Startup
Developed a PCI-DSS level 1 compliant payment API handling $2M in monthly transactions. Achieved 99.99% uptime with sub-10ms latency. Stack: Go, gRPC, Stripe Connect, Redis.
Inventory Sync API for Multi-Channel Ecommerce Brand
Unified inventory across Shopify, Amazon, and 3PL warehouse using a RESTful API. Decreased overselling by 95%. Stack: Express.js, PostgreSQL, AWS Lambda.
Usage Metering API for B2B SaaS Platform
Created a metering API that tracks 10M+ events per day for per-seat billing. Reduced invoice disputes by 80%. Stack: Node.js, TimescaleDB, Kafka.
MLS Data Aggregation API for Real Estate Startups
Aggregated listing data from 200+ MLS providers into a single REST API. Cut data refresh time from 24 hours to 15 minutes. Stack: Python, PostgreSQL, Redis Streams.
Student Record API for EdTech Platform
Built a FERPA-compliant API to sync student data between LMS and gradebook. Reduced manual data entry by 8 hours per week per school. Stack: .NET Core, GraphQL, Azure SQL.
Why teams hire us.
Fixed price, not hourly billing
Every API project gets a fixed quote after the Roadmap phase (week 2). No hourly tracking, no surprise invoices, no scope creep charges. 95% of our projects stay within budget.
Production-ready in 8-12 weeks
Our engineered process delivers a documented, tested, and deployed API in under 12 weeks. We have a 98% on-time record across 200+ products.
Compliance built in, not bolted on
We bake HIPAA, PCI-DSS, SOC 2, and GDPR into the architecture from day one. Our compliance checklist has 40+ items validated during deployment.
Full code ownership and no lock-in
You own all source code, documentation, and infrastructure scripts. No proprietary frameworks. You can run the API anywhere after we hand it over.
Dedicated team of senior engineers
Every project gets a senior engineer, a QA specialist, and a DevOps engineer. Our team averages 8+ years of experience. You communicate directly via Slack and weekly calls.
Obsessive testing and monitoring
We enforce >80% code coverage and run performance tests with k6. Every API gets Sentry monitoring, Datadog dashboards, and PagerDuty alerts for 99.9% uptime.
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.