I will integrate rest apis payments or ecommerce data with your backend or CRM

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Hyun Cho
integrate rest apis payments or ecommerce data with your backend or CRM
Full Screen
integrate rest apis payments or ecommerce data with your backend or CRM
Full Screen
integrate rest apis payments or ecommerce data with your backend or CRMintegrate rest apis payments or ecommerce data with your backend or CRM

About this gig

Orders in one system, customers in another, and someone copies data by hand every day. I build the bridge.


20 years of backend integrations: e-commerce and live-commerce platforms, CRM membership systems (points, cards, orders), payment gateways, third-party REST/GraphQL APIs, webhooks and scheduled syncs. Java/Spring Boot, Node.js or PHP against MySQL, PostgreSQL or MS-SQL.


You get: working integration code in your stack, auth, retries, idempotency and logging so it does not silently fail, a mapping document (which field goes where), and a screen recording of the flow.


Examples: Shopify, WooCommerce or Cafe24 to ERP or Google Sheets. Payment gateway to orders. CRM to marketing tool. Any REST API to your database.


Not included: building the whole product, mobile apps, machine learning.


Async, written communication, UTC+9. Reply within 24h.

  • Expertise

    • Debugging
    • Security
    • Databases
    • Testing procedures

  • Programming language

    • Java

  • Frontend framework

    • jQuery
    • React.js
    • Vue.js

  • Backend framework

    • Laravel
    • CodeIgniter
    • Express.js
    • Node.js
    • Spring Boot

Get to know Hyun Cho

Hyun Cho

Full stack rescue developer for Java Spring Boot Node PHP React and Linux

  • FromSouth Korea
  • Member sinceFeb 2021

  • Languages

    English, Korean
20 years building and running web backends: Java/Spring Boot, Node.js (Express), PHP (CodeIgniter), React/Vue, MySQL/PostgreSQL/MS-SQL, Linux + Nginx + GitLab CI. I fix what is broken and ship what is half-done: API bugs, Nginx 502/504, failed deploys, slow queries, legacy-to-Spring Boot migrations, e-commerce/CRM integrations. How I work: written brief first, fixed scope, daily written update, a short screen recording when I deliver. Remote and async (UTC+9 - your night is my working day). No AI/ML claims, no mobile-native. If your problem is not in my list, I say so on day one.

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