Professional Custom API Development ConsultantsAPI Development
We build APIs that move data your way. Get a fixed-price quote in week two.
IRPR builds custom APIs for web and mobile apps. We use frameworks like Express.js, FastAPI, and GraphQL to design secure, scalable endpoints that handle millions of requests per day.
Each project ships in 12-14 weeks with a fixed price between $80K and $250K. We handle compliance for HIPAA, PCI DSS, and SOC 2 as part of the build.
We work with CTOs scaling their platform, product managers automating integrations, and founders building API-first businesses. Our team of senior engineers has shipped over 200 products globally.
Types of software we ship.
REST API Development
Build stateless, cacheable RESTful endpoints using Express.js or FastAPI. Ideal for web and mobile backends.
GraphQL API Development
Deliver flexible, strongly-typed APIs with Apollo GraphQL and Prisma. Clients fetch exactly the data they need.
Third-Party API Integration
Connect your app to Salesforce, Stripe, HubSpot, or Slack. We handle OAuth, webhooks, and rate limiting.
Microservices API Gateway
Deploy a gateway layer (Kong, AWS API Gateway) to route, throttle, and authenticate traffic across services.
Payment API Integration
Integrate Stripe, Braintree, or Adyen. We build idempotent endpoints that prevent double charges.
Social Media API Integration
Pull data from Twitter, LinkedIn, Instagram using OAuth2 and webhooks. Aggregate feeds in real time.
E-commerce API Development
Custom Shopify or Magento endpoints for inventory sync, order management, and custom checkout flows.
IoT API Development
Handle device telemetry with MQTT and REST APIs. Store sensor data in TimescaleDB and alert via SNS.
We build for every business type.
Healthcare
Fintech
SaaS
E-commerce
Enterprise
Proven results from custom API projects
Every API we build ships with real-world metrics that matter to you.
We track delivery time, compliance standards met, and uptime across all projects. Our engineers average 10+ years of experience, which keeps estimations accurate and code clean.
Since 2018, IRPR has shipped over 200 products in 50+ countries. Our on-time delivery rate is 98%. We guarantee 99.9% uptime on all production APIs.
The difference between generic dev shops and IRPR
Not all API consultants deliver the same quality. Here is how IRPR stands out.
Generic dev shops bill hourly, change scope without notice, and leave you with undocumented code. They rarely understand compliance requirements like HIPAA or PCI DSS.
IRPR gives you a fixed price, a clear roadmap, and senior engineers who write tests and documentation as standard practice. You own every line of code.
- Hourly billing and scope creep
- No fixed delivery timeline
- Junior developers on your project
- No compliance knowledge
- Handoff without API docs or tests
- Single tech stack forced on you
- Fixed price locked in week 2
- 12-14 week delivery guarantee
- Senior engineers with 10+ years avg
- HIPAA, PCI, SOC2 built in
- Full documentation, tests, CI/CD included
- Right stack for your use case (Node, Python, Go, etc)
How we build your custom API in 4 phases
Our process removes uncertainty. You see progress every week.
We start with a Discovery phase to map your data sources, users, and performance requirements. Then we create a detailed Roadmap with a fixed price.
During Build we ship working endpoints every sprint. The Release phase includes load testing, security review, and a 30-day monitoring handoff.
What ships with every API project
Every deliverable is designed to make your team productive from day one.
You receive everything needed to run, modify, and scale the API yourself. No hidden dependencies, no legacy surprises.
IRPR provides deployment scripts, environment configuration, and a runbook. Your ops team can start managing the API within hours.
- Source code in your private GitHub/GitLab repo
- Automated CI/CD pipeline (GitHub Actions or CircleCI)
- Unit and integration tests (coverage > 80%)
- Sentry error tracking and DataDog monitoring
- API documentation (Swagger/OpenAPI 3.0)
- Postman collection with environment variables
- Deployment scripts for AWS, GCP, or Azure
- Security audit report (OWASP top 10 check)
- Runbook with incident response steps
- 30-day post-release support
What we ship in this practice.
Custom Payment Gateway API
Built a PCI-compliant payment API that processed $5M in transactions monthly. Integrated with Stripe and Plaid for ACH and card payments. Reduced chargebacks by 20% with idempotency logic.
Real-Time Inventory API for Retail
Developed a WebSocket-based inventory API for a national retailer. Reduced stockouts by 40% using Node.js, Redis pub/sub, and AWS Lambda. Handled 10,000 updates per second.
Healthcare Interoperability FHIR API
Created a FHIR R4 API that connected 3 hospital systems. Cut patient data retrieval from 2 hours to 12 seconds. Built with FastAPI, FHIR validators, and Azure Healthcare API.
SaaS Webhook API for Event Processing
Engineered a webhook delivery system that processes 10M events per day. Used Kafka for buffering and Go for low-latency dispatch. Achieved 99.98% delivery success.
Social Media Aggregator API
Built a unified API that fetches posts from 5 platforms (Twitter, LinkedIn, Instagram, YouTube, TikTok). Saved a media agency 20 hours of manual scraping per week. Stack: Express.js, OAuth2, Redis caching.
Enterprise Analytics API
Designed a GraphQL API for internal analytics serving 500+ requests per second. Connected 12 data sources including PostgreSQL, Snowflake, and Salesforce. Reduced report generation from 4 hours to 5 minutes.
Why teams hire us.
Fixed price from week 2
IRPR estimates your project during the Roadmap phase and locks the price. No hourly billing, no surprise invoices, no scope creep charges.
Senior engineers only
Our team averages over 10 years of API development experience. We do not assign junior developers to client projects.
Compliance built in
IRPR ships HIPAA, PCI DSS, and SOC 2 compliant APIs. We include audit logs, encryption at rest, and data masking where required.
Full code ownership
You receive complete source code, tests, documentation, and CI/CD scripts. There is no proprietary framework or recurring license fee.
Async-first collaboration
We work with clients across 50+ countries using Slack, Notion, and weekly video calls. Overlap hours ensure real-time communication when needed.
12-14 week delivery
IRPR delivers 98% of projects on time. We use 2-week sprints, automated testing, and weekly demos to keep you informed and on schedule.
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.