I will fix or build your script, backend, or automation

China

I speak English, Chinese

Full stack engineer

A Full Stack Engineer with over 9 years of experience, having developed various types of applications such as quantitative trading software, AI applications, data management tools, web development, an...
About this Gig

Need help fixing, building, or improving a script, backend, API integration, automation tool, or workflow? I can help you turn your requirements into a clean, reliable, and maintainable solution.


I'm Yellin, a full-stack developer with 9+ years of experience in backend, APIs, automation, web apps, AI integrations, and software development. I work with Python, Node.js, FastAPI, Flask, Express, scripts, APIs, data processing, webhooks, and backend systems.


I can help with:

  • Script development
  • Backend bug fixes and debugging
  • API development with Python or Node.js
  • API integration and automation
  • Data processing and file handling
  • Webhook setup and debugging
  • Workflow automation
  • Task scheduling and background jobs
  • Script refactoring and cleanup
  • Error handling and performance improvements


I focus on clear requirements, clean code, reliable automation, secure API handling, and smooth communication.


The basic package is for one small, clearly defined script, backend, or automation task. Complex systems may require a custom offer.


Contact me today, and let's discuss your project!

My Portfolio