I will develop custom API integrations for your web app

J
johnjamesv
J
johnjamesv
JOHN J
develop custom API integrations for your web app
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develop custom API integrations for your web app

About this gig

Need a reliable API integration that works smoothly with your website, web app, or software?


Youre in the right place.


I will professionally integrate REST APIs, third party APIs, webhooks, payment APIs, and custom API solutions into your application. I can connect your platform with external services, configure authentication, exchange data securely, troubleshoot API errors, and make sure everything works as expected.


What I can help you with:

  • REST API integration
  • Third party API integration
  • Webhook integration
  • Payment/API gateway integration
  • API authentication & configuration
  • API connection and data transfer
  • API troubleshooting & error fixing
  • Custom API integration
  • Testing and debugging


Whether you need to connect your website to a CRM, payment system, AI service, marketplace, automation platform, or another third-party service, I can help.


 Ready to integrate your API? Message me now with your requirements, and lets get started!

  • Expertise

    • Security
    • Operating systems
    • Design
    • Databases
    • Testing procedures

  • Programming language

    • JavaScript

  • Frontend framework

    • Next.js
    • Nuxt.js
    • React.js

  • Backend framework

    • FastAPI
    • Fastify
    • Next.js
    • Strapi
    • Supabase

Get to know JOHN J

JOHN J

API Integration Developer

  • FromPortugal
  • Member sinceAug 2026
  • Avg. response time1 hour

  • Languages

    English, German, Spanish
Backend developer specializing in API integration, REST API, Webhook, Stripe API, ChatGPT API, Shopify API, CRM API, n8n, Make.com, and payment gateway integration. I build secure, scalable, and reliable API solutions using PHP, Node.js, and Python. From automation and third-party integrations to API debugging and custom backend development, I deliver clean code, fast communication, and quality results.

My Portfolio

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