Senior API Integration Development DevelopersIntegration Developers
We build custom API integrations that connect your tools and automate workflows. Fixed price, 8-12 week delivery, full code ownership.
IRPR builds custom API integrations using REST, GraphQL, SOAP, and webhooks. We connect CRMs, ERPs, payment gateways, and legacy systems into a single workflow.
Every integration ships in 8-12 weeks with a fixed price between $80K and $250K. We handle HIPAA, PCI-DSS, and SOC 2 compliance requirements. Source code stays in your repo, and we set up CI/CD on GitHub Actions.
We work with CTOs who need to unify disjointed tools, product managers automating manual data entry, and compliance officers requiring audit-proof data flows. Our senior engineers have built integrations for 200+ products across 50 countries.
Types of software we ship.
CRM API integration
Sync contacts, deals, and activities between Salesforce, HubSpot, and your internal tools via REST APIs.
Payment gateway API integration
Connect Stripe, Braintree, Adyen, or PayPal to your platform with idempotent endpoints and webhook retries.
ERP API integration
Integrate NetSuite, SAP, or Microsoft Dynamics with ecommerce platforms and inventory systems using SOAP or OData.
Healthcare API integration
Build HIPAA-compliant FHIR APIs to connect EHRs like Epic and Cerner with patient portals and analytics tools.
Ecommerce API integration
Sync orders, inventory, and shipping data between Shopify, Magento, and 3PL providers via GraphQL and webhooks.
Marketing automation API integration
Connect Mailchimp, Klaviyo, Marketo, or HubSpot to your data warehouse for real-time campaign triggers.
Fintech API integration
Implement Plaid, Stripe Connect, or Yodlee for bank data aggregation, ACH transfers, and KYC verification.
Custom middleware API integration
Build a centralized integration layer using Node.js and Express that connects legacy systems to modern SaaS tools.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS
Logistics
Why senior API integration development developers matter
Junior developers create fragile point-to-point connections. Senior engineers build resilient, scalable integrations that handle errors and scale.
A poorly designed API integration breaks when a vendor changes their endpoint schema. IRPR uses circuit breakers, retry logic with exponential backoff, and idempotency keys to ensure data consistency. We also implement comprehensive logging with Sentry and Datadog so you know exactly what happened if something fails.
Our senior developers have integrated 200+ APIs across healthcare, fintech, and ecommerce. We follow the strangler pattern to replace legacy integrations without downtime. Every integration ships with automated tests (Jest, Postman collections) and a runbook for operations.
The difference between generic dev shops and senior API integration developers
Not all developers can handle complex integrations. Here is what sets IRPR apart.
Generic shops often assign junior developers who learn on your dime. They write monolithic code that is hard to test and harder to maintain. When the vendor API changes, your integration breaks and you pay for emergency fixes.
IRPR assigns senior engineers who have built production integrations for 200+ products. We design for change: we use adapter patterns, contract testing, and feature flags. You get a fixed price, full code ownership, and a CI/CD pipeline from day one.
- Junior developers with 1-2 years experience
- Hourly billing with no cap
- No automated tests for integration
- Fragile point-to-point connections
- No monitoring or alerting
- Code stays on their servers
- Senior engineers with 10+ years experience
- Fixed price from $80K to $250K
- Comprehensive test suite (Jest, Postman)
- Resilient adapter pattern with circuit breakers
- Sentry + Datadog monitoring included
- Full source code in your GitHub repo
Our process for senior API integration development
We follow a four-phase process that starts with a roadmap and ends with a production-ready integration.
Every project begins with a 2-week Roadmap phase where we map your existing systems, identify integration points, and define success metrics. You get a fixed quote for the entire build before we write a single line of code.
The Product phase is where our senior engineers build the integration using your chosen tech stack. We deploy to staging, run integration tests, and iterate based on your feedback. The Release phase includes deployment, monitoring setup, and a 30-day warranty.
What ships with every API integration project
Every integration includes everything you need to run it in production from day one.
We do not just deliver code. You get a complete operational package: monitoring, alerting, documentation, and a runbook. Your team can take over maintenance immediately or we can continue to support it.
- Source code in your private GitHub repo
- CI/CD pipeline with GitHub Actions
- Automated test suite (Jest, Postman collections)
- Sentry error tracking and alerting
- Datadog dashboards for latency and error rates
- API documentation (OpenAPI/Swagger)
- Runbook with incident response steps
- 30-day warranty with bug fixes
- Postman collection for manual testing
- Deployment guide for staging and production
What we ship in this practice.
Healthcare FHIR API integration
Built a HIPAA-compliant FHIR API that connects a telemedicine platform to Epic and Cerner EHRs. Reduced manual data entry by 12 hours per week per provider. Tech stack: Node.js, Express, FHIR R4, PostgreSQL, AWS.
Fintech Plaid and Stripe integration
Integrated Plaid for bank account verification and Stripe Connect for ACH payments. Eliminated manual reconciliation and saved the client 20 hours per week. Tech stack: Python, FastAPI, Plaid API, Stripe API, Redis.
Ecommerce Shopify and 3PL integration
Connected Shopify to a 3PL warehouse system via GraphQL and webhooks. Synced inventory levels in real time and reduced order processing time by 40%. Tech stack: Node.js, Apollo Server, Shopify API, PostgreSQL.
SaaS Salesforce and HubSpot integration
Built a bidirectional sync between Salesforce and HubSpot using REST APIs. Eliminated duplicate data entry and improved lead response time by 30%. Tech stack: Node.js, Express, Salesforce REST API, HubSpot API.
Real estate MLS API integration
Integrated a real estate platform with 5 MLS providers using RETS and RESO Web API. Enabled automated listing syndication and reduced manual listing updates by 15 hours per week. Tech stack: Python, Django, RETS API, PostgreSQL.
Manufacturing ERP and IoT integration
Connected a NetSuite ERP to IoT sensors on the factory floor using MQTT and REST APIs. Enabled real time production monitoring and reduced downtime by 25%. Tech stack: Node.js, MQTT, NetSuite SuiteTalk, InfluxDB.
Why teams hire us.
Fixed price, not hourly
Every integration project gets a fixed quote after the 2-week Roadmap phase. No hourly billing, no surprise invoices, no scope creep charges. You know the total cost before we start building.
Senior engineers only
We assign developers with 10+ years of experience in API integration. No juniors, no offshore teams, no learning on your dime. Every engineer has shipped production integrations for 200+ products.
Full code ownership
You own the entire codebase from day one. It lives in your GitHub repo, not ours. You can take over maintenance, hire another team, or open source it. No lock-in, no licensing fees.
Compliance built in
We handle HIPAA, PCI-DSS, SOC 2, and GDPR requirements as part of every integration. We use encryption at rest and in transit, audit logs, and role-based access controls. No compliance surprises after launch.
8-12 week delivery
Most integrations ship in 8-12 weeks. We use agile sprints with weekly demos so you see progress every 7 days. 98% of our projects deliver on time.
Production ready operations
Every integration includes Sentry error tracking, Datadog monitoring, and a runbook. We set up alerting so you know before your users do. Your operations team can sleep through the night.
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.