Senior API Integration Development ServicesIntegration Development
We connect your software to the tools you depend on. REST, SOAP, GraphQL — built by senior engineers in 8-12 weeks.
IRPR builds production-grade API integrations for companies that need their systems to talk to each other. We use Express.js, Fastify, Kong, Kafka, and Postman to create connectors that sync data reliably between CRMs, ERPs, payment gateways, and legacy services.
You get a fully functional integration in 12-14 weeks with a fixed price of $80K-$250K. Every integration passes compliance checks for HIPAA, PCI-DSS, or SOC 2 before it ships. Code is yours from day one.
We work with CTOs who need to connect Salesforce to their internal ERP. With product managers who need a Stripe-Salesforce integration. With operations directors who need to sync inventory across Shopify, NetSuite, and 3 warehouses. With engineering leads who need a secure bridge between a legacy .NET service and a new Next.js app.
Types of software we ship.
REST API integration
Connect two systems using HTTP methods. We build endpoints that handle JSON payloads with rate limiting and retry logic via Kong.
SOAP API integration
Connect legacy enterprise systems that use XML envelopes. We handle WSDL parsing, WS-Security, and complex schema validation.
GraphQL API integration
Build a unified GraphQL layer that queries multiple backends. Apollo Federation, schema stitching, and real-time subscriptions included.
File-based API integration
Sync data via SFTP, S3, or email attachments. We parse CSV, XML, EDI, and JSON files and push them into your database with error logging.
Event-driven API integration
Build a pub/sub system with Kafka or RabbitMQ. Process high-volume events from Shopify, Stripe, or HubSpot without data loss.
ERP API integration
Connect NetSuite, SAP, or Microsoft Dynamics to your stack. We handle complex mapping for orders, inventory, and financial transactions.
Payment gateway API integration
Integrate Stripe, Braintree, or Adyen with your checkout flow. We handle idempotency, webhook verification, and PCI-DSS compliance.
Ecommerce platform API integration
Sync products, orders, and customers between Shopify, BigCommerce, Magento, and your backend. Real-time inventory updates included.
We build for every business type.
Healthcare
Fintech
Ecommerce
SaaS Companies
Logistics and Manufacturing
Why custom API integration beats off-the-shelf connectors
Pre-built connectors hit limits when your data model or business rules are unique.
Off-the-shelf tools like Zapier or MuleSoft work for simple one-way syncs. But when you need bidirectional sync with conflict resolution, custom error handling, or field-level mapping, they fall short. IRPR builds custom API integrations that handle your exact data schema and business logic.
We use Fastify and Node.js to build connectors that process 10,000+ requests per minute with built-in retry and dead-letter queues. Every integration includes monitoring via Datadog and error alerts via Sentry. You own the code and run it anywhere.
Generic API shops vs. IRPR senior API integration developers
The difference is in the architecture, testing, and compliance.
Many dev shops build one-off scripts that break when upstream APIs change. IRPR builds integrations with proper error handling, schema validation, and automated tests that run on every deploy.
Our integrations include a test harness in Postman or Newman, type-safe code in TypeScript, and a monitoring dashboard. Compliance checks for HIPAA or PCI-DSS are included in the build.
- No schema versioning, breaks on API updates
- No automated tests for edge cases
- No monitoring or alerting for failures
- No retry or dead-letter queue logic
- No compliance review for HIPAA or PCI
- Source code often locked behind NDAs
- Schema versioning with JSON Schema or Protocol Buffers
- Automated test suite covering 150+ scenarios
- Datadog monitoring + Sentry error alerts included
- Retry with exponential backoff + dead-letter queue (DLQ)
- HIPAA, PCI-DSS, or SOC 2 review built into Roadmap
- Full source code in your Git repo from day one
Our 4-phase API integration delivery process
We build integrations the same way we build products: with a fixed timeline and fixed price.
Every integration starts with a discovery call to map your endpoints, data fields, and business rules. We produce a written Roadmap with a fixed price and timeline in week 2.
After you approve the Roadmap, we build the integration in 8-12 weeks. We deploy to your cloud or on-prem infrastructure. You get the full source code and documentation.
What ships with every API integration project
Every deliverable is concrete and usable on day one.
You don't just get code. You get the entire setup to run, monitor, and maintain the integration yourself.
All code is TypeScript, runs in Docker containers, and is deployed via GitHub Actions. No black boxes.
- Source code in your private GitHub/GitLab repo
- Docker Compose file for local development
- CI/CD pipeline via GitHub Actions or GitLab CI
- Automated Postman/Newman test collection (100+ tests)
- Schema validation library for incoming and outgoing payloads
- Retry logic with exponential backoff and dead-letter queue
- Datadog dashboard with request latency, error rate, and throughput
- Sentry error tracking with alert rules
- Runbook covering start, stop, restart, and monitor steps
- 30-day post-launch support with SLA
What we ship in this practice.
Salesforce-NetSuite order sync
A B2B manufacturer needed to sync orders from Salesforce into NetSuite without manual entry. IRPR built a Fastify-based integration that maps 45 fields, handles currency conversion, and logs every transaction. Result: 12 hours/week saved on data entry. Tech stack: Fastify, Node.js, Salesforce REST API, NetSuite SOAP API, Kafka for queuing.
Stripe-HubSpot payment reconciliation
A SaaS company needed to sync payment data from Stripe to HubSpot for automated revenue reporting. IRPR built a serverless integration using AWS Lambda and EventBridge. Result: 20 hours/month saved on manual reconciliation. Tech stack: Stripe API, HubSpot API, AWS Lambda, DynamoDB.
Epic EHR to lab system lab data exchange
A hospital network needed to send lab orders from Epic to Quest Diagnostics and receive results automatically. IRPR built an HL7 FHIR integration with full HIPAA compliance. Result: lab results delivered in 4 minutes instead of 2 hours. Tech stack: Epic FHIR API, Quest API, Node.js, AWS HealthLake.
Shopify-WMS inventory sync
An ecommerce brand with 3 warehouses needed real-time inventory sync from Shopify to their warehouse management system. IRPR built a webhook-based integration that updates stock levels within 5 seconds. Result: zero overselling incidents in 6 months. Tech stack: Shopify GraphQL API, custom WMS API, RabbitMQ, PostgreSQL.
Plaid-Slack fraud alert integration
A fintech startup needed to send real-time fraud alerts from their Plaid-powered transaction monitoring to a Slack channel. IRPR built a serverless integration on AWS. Result: fraud detection alerts delivered in under 1 second. Tech stack: Plaid API, Slack API, AWS EventBridge, Lambda.
Zendesk-QuickBooks customer-insurance sync
A real estate insurance broker needed to sync customer data from Zendesk to QuickBooks for automated invoicing. IRPR built a scheduled integration that runs every 15 minutes. Result: 10 hours/week saved on manual invoice generation. Tech stack: Zendesk API, QuickBooks Online API, Node.js, cron on AWS ECS.
Why teams hire us.
Senior engineers only, no juniors
Every engineer on your project has 8+ years experience. We don't train juniors on your dime. You get a single point of contact who knows your data model and business logic.
Fixed price from week 2
After the Roadmap phase (week 2), we give you a fixed price for the entire integration. No hourly billing, no surprise charges, no scope creep. You approve the price before we write a line of code.
Full code ownership
You get the complete source code in your repository from day one. No proprietary frameworks, no license fees, no lock-in. You can run the integration anywhere.
Compliance built in, not bolted on
HIPAA, PCI-DSS, and SOC 2 reviews happen during the Roadmap phase, not after the build. We write security controls into the architecture before we start coding.
8-12 week delivery for most integrations
We use proven patterns — Express.js, Fastify, Kong — and adapt them to your specific endpoints. Most integrations ship in 8-12 weeks from Roadmap approval.
Post-launch monitoring included
We set up Datadog dashboards and Sentry alerts before launch. You get a 30-day support window with a 4-hour response SLA. We don't disappear after deployment.
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.