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chanwoothecali/README.md

Hi there, I'm Chanwoo ๐Ÿ‘‹

Backend Developer ยท Building AI on top of production systems

์šด์˜ํ˜• ๋ฐฑ์—”๋“œ ์œ„์— AI ํŒŒ์ดํ”„๋ผ์ธ์„ ์–น๋Š” ์ผ์— ๊ด€์‹ฌ์ด ๋งŽ์Šต๋‹ˆ๋‹ค.

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๐Ÿงญ About Me

name:        ์ •์ฐฌ์šฐ (Jung Chanwoo)
role:        Backend Developer @ KoreaEDS
focus:       AI Backend ยท LLM Pipelines ยท Production Reliability
location:    Seoul, Korea
education:   M.S. in Computer Software Engineering, Yonsei University (2026)
  • ์ผํ‰๊ท  657๋งŒ+ ํ˜ธ์ถœ ๊ทœ๋ชจ์˜ ๋ฆฌํ…Œ์ผ ์•ฑ/์›น ์„œ๋น„์Šค์—์„œ ์ฟ ํฐยท์ด๋ฒคํŠธยท์‡ผํ•‘๋งตยท๊ด€๋ฆฌ์žยท๋ฐฐ์น˜ ์˜์—ญ์„ 5๋…„๊ฐ„ ์šด์˜ํ•ด์™”์Šต๋‹ˆ๋‹ค.
  • ์‹ค๋ฌด์™€ ๋ณ‘ํ–‰ํ•œ ๊ณตํ•™๋Œ€ํ•™์› ๊ณผ์ •์—์„œ LLMยทRAGยทQLoRA ํŒŒ์ธํŠœ๋‹ ๊ธฐ๋ฐ˜ AI ๋ฐฑ์—”๋“œ ํŒŒ์ดํ”„๋ผ์ธ์„ ์ง์ ‘ ์„ค๊ณ„ยท๊ตฌํ˜„ํ–ˆ์Šต๋‹ˆ๋‹ค.
  • ์šด์˜ ์•ˆ์ •์„ฑ, ๋ฐ์ดํ„ฐ ์ •ํ•ฉ์„ฑ, AI ์‘๋‹ต ์‹ ๋ขฐ๋„๋ฅผ ํ•จ๊ป˜ ๊ณ ๋ คํ•˜๋Š” ๋ฐฑ์—”๋“œ๋ฅผ ์ง€ํ–ฅํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ›  Tech Stack

Backend

Database

AI / LLM

Infra & Tools


๐Ÿ’ผ Experience

๐Ÿข ํ•œ๊ตญ์ด๋””์—์Šค (KoreaEDS) ยท Backend Developer ยท 2019.12 โ€” Present

๐Ÿ“Œ ๋กฏ๋ฐ๋ฐฑํ™”์  ์šด์˜ (2021.01 โ€” Present)
   โ”” ์ผํ‰๊ท  657๋งŒ+ ํ˜ธ์ถœ / ์ตœ๋Œ€ ์ผ์ผ 1,021๋งŒ+ ํ˜ธ์ถœ / ๋ˆ„์  2.03์–ต+ ํ˜ธ์ถœ
   โ”” ์ฟ ํฐ ยท ๋ชจ๋ฐ”์ผ ์ด๋ฒคํŠธ ยท ์‡ผํ•‘๋งต ยท ์˜ˆ์•ฝ ยท ๊ด€๋ฆฌ์ž ยท ๋ฐฐ์น˜ ยท ์™ธ๋ถ€ ์—ฐ๋™
   โ”” ๋ฐ์ดํ„ฐ ์ •ํ•ฉ์„ฑ ์ถ”์ , ์žฅ์•  ๋Œ€์‘, ์™ธ๋ถ€ API ์—ฐ๋™, ์šด์˜ ๋ฐฐํฌ

๐Ÿ“Œ NSํ™ˆ์‡ผํ•‘ ์ œํœด ์‹œ์Šคํ…œ ๊ณ ๋„ํ™” (2020.01 โ€” 2020.09)
   โ”” ์ œํœด์‚ฌ โ†” NSํ™ˆ์‡ผํ•‘ ์ฃผ๋ฌธ ยท ๋ฐฐ์†ก ยท CS ยท ์ •์‚ฐ ๋ฐ์ดํ„ฐ ์—ฐ๋™
   โ”” JMS ๋น„๋™๊ธฐ ์ฒ˜๋ฆฌ, PostgreSQL JSON Operator ํ™œ์šฉ

๐Ÿš€ Featured Project

HrAutoFlow โ€” AI-powered Resume Analysis System

์ด๋ ฅ์„œ ์—…๋กœ๋“œ๋ถ€ํ„ฐ ํ…์ŠคํŠธ ์ถ”์ถœ ยท ์ž„๋ฒ ๋”ฉ ยท ๋ฒกํ„ฐ ๊ฒ€์ƒ‰ ยท LLM ๋ถ„์„ ยท RAG ์งˆ์˜์‘๋‹ต๊นŒ์ง€ ์ด์–ด์ง€๋Š” end-to-end AI ๋ฐฑ์—”๋“œ ํŒŒ์ดํ”„๋ผ์ธ์„ ์ง์ ‘ ์„ค๊ณ„ยท๊ตฌํ˜„ํ•œ ๋Œ€ํ•™์› ์กธ์—… ํ”„๋กœ์ ํŠธ์ž…๋‹ˆ๋‹ค.

๐Ÿ”ง Backend Pipeline

  • extracting โ†’ chunking โ†’ embedding โ†’ analyzing โ†’ completed/failed 6๋‹จ๊ณ„ ์ƒํƒœ ๋จธ์‹  ๊ธฐ๋ฐ˜ ์ฒ˜๋ฆฌ
  • asyncio.gather + return_exceptions=True ๋กœ 5๊ฐœ LLM ๋ถ„์„ task ๋ณ‘๋ ฌ ์‹คํ–‰ ๋ฐ ๋ถ€๋ถ„ ์‹คํŒจ ๊ฒฉ๋ฆฌ
  • LangChain LCEL ์ฒด์ธ ํŒจํ„ด (prompt | llm | StrOutputParser) ๊ธฐ๋ฐ˜ ํ”„๋กฌํ”„ํŠธ ๋ชจ๋“ˆํ™”
  • PGVector + NumPy ์ฝ”์‚ฌ์ธ ์œ ์‚ฌ๋„ ์ง์ ‘ ๊ตฌํ˜„์œผ๋กœ doc_id ํ•„ํ„ฐ๋ง RAG ๊ฒ€์ƒ‰

๐Ÿค– LLM Fine-tuning (Model Compression)

  • Llama 3.1 8B Instruct ๋ฒ ์ด์Šค ๋ชจ๋ธ ์œ„์— 4bit QLoRA SFT ํ•™์Šต
  • bnb_4bit_quant_type=nf4 ยท bf16 compute ยท paged_adamw_8bit ยท gradient checkpointing
  • ์ง๋ฌด๋ณ„ ํ‰๊ฐ€ ์–ด๋Œ‘ํ„ฐ ๋ถ„๋ฆฌ ํ•™์Šต (team_backend / team_frontend)
  • target_modules: q/k/v/o_proj + gate/up/down_proj ์ „์ฒด ์–ด๋Œ‘ํŒ…
  • SFT ๋ฐ์ดํ„ฐ์…‹ 14,000๊ฑด ์ž์ฒด ์„ค๊ณ„ (tech / experience / impact / growth 4์ถ• ํ‰๊ฐ€)

โš™๏ธ LLMOps Design

  • LLM Provider ์ถ”์ƒํ™” (Ollama / OpenAI / Upstage SOLAR)
  • Human-in-the-loop ํ‰๊ฐ€ ๋ชจ๋ธ โ€” AI ์ ์ˆ˜์™€ ํ‰๊ฐ€์ž ์ ์ˆ˜ ๋ถ„๋ฆฌ ์ €์žฅ
  • QA History + Good-case Vector โ€” RAG ์‘๋‹ต ํ’ˆ์งˆ ํ”ผ๋“œ๋ฐฑ ๋ˆ„์  ๊ตฌ์กฐ
Tech: FastAPI ยท PostgreSQL ยท PGVector ยท LangChain ยท Ollama
      Llama 3.1 8B ยท QLoRA ยท PEFT ยท TRL ยท Transformers ยท Next.js

๐ŸŒฑ Currently Learning

  • LangGraph โ€” Agent ๊ธฐ๋ฐ˜ ์ œํ’ˆ ์„ค๊ณ„ ๋ฐ multi-step reasoning
  • vLLM ยท TensorRT-LLM โ€” Production-grade LLM serving (PagedAttention, continuous batching)
  • MSA ยท Kubernetes โ€” AI ์„œ๋น„์Šค์˜ ํ™•์žฅ์„ฑ๊ณผ ์šด์˜ ์ž๋™ํ™”

๐ŸŽ“ Education

  • M.S. Computer Software Engineering, Yonsei University Graduate School of Engineering (2024 โ€” 2026)
  • B.S. Food and Nutrition, The Catholic University of Korea (2012 โ€” 2019)

๐Ÿ“Š GitHub Stats

Chanwoo's GitHub stats Top Languages


"์•ˆ์ •์ ์ธ ๋ฐฑ์—”๋“œ ์œ„์—, ์‹ ๋ขฐํ•  ์ˆ˜ ์žˆ๋Š” AI๋ฅผ ์–น์Šต๋‹ˆ๋‹ค."

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