I will integrate stripe twilio quickbooks or any third party API into your backend

I
iloomnex
I
iloomnex
Iloomnex
integrate stripe twilio quickbooks or any third party API into your backend
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integrate stripe twilio quickbooks or any third party API into your backend

About this gig

Third-party API work is where most backend projects quietly break. Stripe webhooks arrive out of order and get processed twice. Twilio rate limits trip in production and nobody noticed. Plaid tokens expire and break onboarding at 2am. OAuth flows work in testing and fail the moment a real user tries. The integration itself is rarely the hard part. The retries, idempotency, webhook replay protection, and error handling are.

I've shipped integrations in production for real clients. Stripe for payment processing and subscriptions. Twilio for SMS and voice. SendGrid and Postmark for transactional email. Plaid for banking. QuickBooks and Xero for accounting sync. Shopify and Amazon SP-API for e-commerce. Unified.to for multi-CRM work. Plus dozens of custom REST and webhook integrations that don't have famous names.

The code is Node.js and TypeScript. I handle OAuth flows properly, verify webhook signatures, build retry logic with exponential backoff, and make sure your integration survives the provider's next incident without waking you up.


I reply within an hour, any timezone. Message me with what you need wired up.

  • Expertise

    • Debugging
    • Performance
    • Security
    • Databases

  • Programming language

    • TypeScript

  • Backend framework

    • Express.js
    • NestJS
    • Next.js
    • Node.js

Get to know Iloomnex

Iloomnex

Senior backend engineer

5.0(11)
  • FromPakistan
  • Member sinceNov 2023
  • Avg. response time1 hour
  • Last delivery1 year

  • Languages

    English
Senior backend engineer, 4+ years shipping production systems. I build Node.js and NestJS backends on AWS serverless. Lambda, SQS, EventBridge, Step Functions. I handle the integrations most devs avoid: Amazon SP-API, Shopify, QuickBooks, Xero, and LLMs via Bedrock, OpenAI, and Claude. Day job is a multi-tenant HRIS and payroll platform running real traffic. On Fiverr as iLoomNex, I take on backend builds, API integrations, and AI features that need to work in production, not just in a demo. Always online. Reply in under an hour. Any timezone.

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