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Ann Arbor
Sang Jin Yoon

Sang Jin Yoon

Web Developer, AI researcher, Software Developer

Technology / Internet

Ann Arbor, City of Ann Arbor, Washtenaw

Social

About Sang Jin Yoon:

Web & AI developer blending full-stack skills with cutting-edge AI research. 3+ years building responsive apps (React, Node.js, Python/Django) and prototyping LLM-powered tools (LangChain, OpenAI, Hugging Face).

I help startups ship production-ready web platforms and integrate AI features—chatbots, recommendation engines, automated workflows. Recently deployed a RAG pipeline that cut customer-support response time by 40%.

Open to freelance contracts (web dev, AI PoCs) and remote full-time roles.

Experience

3+ years full-stack web dev (React, Node.js, Django) + AI prototyping (LangChain, OpenAI, Hugging Face). Built 15+ client apps and 3 LLM-powered tools. Reduce support response time by 40% with the RAG pipeline. Remote/freelance.

Education

B.Sc. Computer Information Systems from the University of Michigan-Flint, 2023.  
Focus: Web Systems, Coding, and Programming.  
Capstone: Mental Health robot (Python, GPT-2.43) – 92% accuracy on customer queries.

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