I will do api development integration and fixing as a backend developer and full stack

J
j_dev27
J
j_dev27
Joel
do api development integration and fixing as a backend developer and full stack
Full Screen
do api development integration and fixing as a backend developer and full stack
Full Screen
do api development integration and fixing as a backend developer and full stackdo api development integration and fixing as a backend developer and full stack

About this gig

REST API Development, Integration & Automation



Need an API built, connected, or fixed so it actually works the way it should?

I design and build custom REST APIs, integrate third-party services, and automate the workflows between them, for eCommerce stores, travel platforms, finance tools, and custom apps. I work daily with Postman, OAuth2, and RESTful APIs, so every endpoint gets configured, tested, and confirmed in both sandbox and production before handoff.


What you get:


  • Custom API built in Node.js, Go, or Python
  • Secure connection setup for any third-party service
  • Multiple endpoints wired up (GET, POST, PUT, DELETE)
  • Authentication done right (API key or OAuth2)
  • Database setup and modeling (PostgreSQL, MySQL, MongoDB, Redis)
  • Automation scripts and webhook integration
  • Postman collection and environment for testing
  • Debugging, error handling, and a clear walkthrough
  • Payment Gateway Integration


Need to connect Wordpress, Wix, Gohighlevel, QuickBooks, Zoho, Stripe, or your own custom API, or build one from scratch? I'll make sure it's fast, stable, and ready for real traffic.


Send me your project details or API docs and I'll lay out a plan before we start.


  • Programming language

    • Go

  • Expertise

    • Debugging
    • Performance
    • Databases
    • Source control
    • Testing procedures

  • Frontend framework

    • Bootstrap
    • jQuery
    • Next.js
    • React.js
    • Tailwind CSS

  • Backend framework

    • Django
    • Express.js
    • Gin
    • Next.js
    • Node.js

  • AI & low/no code builders

    • Lovable
    • Bolt.new
    • Firebase Studio
    • Base44
    • Co.dev
    • Cursor
    • Softgen
    • Replit
    • Bubble
    • FlutterFlow
    • Adalo
    • OutSystems
    • Mendix
    • Webflow
    • Retool
    • Glide
    • Thunkable
    • AppGyver
    • Zoho Creator
    • Clutch.io
    • Wappler
    • Stacker
    • Softr
    • Ninox
    • Betty Blocks
    • V.One
    • UI Bakery
    • Backendless

Get to know Joel

Joel

API Development and Integration Expert

  • FromCanada
  • Member sinceJun 2026

  • Languages

    English, Spanish, German, French
I'm an API developer who helps businesses connect their tools and automate the work that slows them down. I specialize in API integration and backend automation, linking stores, apps, and platforms with payment gateways, CRMs, and third-party services so your data flows on its own. Every project I deliver comes with clean code, error handling, and clear documentation, so nothing breaks after handover. I'd rather build something reliable than something rushed. Have a project in mind? Message me and let's talk it through.

Other Software Development Services I Offer

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