Skip to content
View yh4752's full-sized avatar
6 followers · 7 following

Achievements

Achievement: Pull Sharkx2

Achievements

Achievement: Pull Sharkx2

Organizations

@egongeill

Block or report yh4752

Block user

Prevent this user from interacting with your repositories and sending you notifications. Learn more about blocking users.

You must be logged in to block users.

Maximum 250 characters. Please don’t include any personal information such as legal names or email addresses. Markdown is supported. This note will only be visible to you.
Report abuse

Contact GitHub support about this user’s behavior. Learn more about reporting abuse.

Report abuse
yh4752/README.md

Hi, I'm Yonghyun Kim πŸ‘‹

🎯 AI Backend Engineer · Search / RAG Systems
πŸŽ“ Sejong University, Intelligent Mechatronics Engineering
πŸ‡°πŸ‡· Based in Seoul Β· πŸ‡―πŸ‡΅ Learning Japanese (JLPT N3)

πŸ” What I do

I design and operate production AI search systems end-to-end β€” from incremental ETL pipelines (Airflow + watermark) to hybrid retrieval (Elasticsearch BM25 + Qdrant dense vector), Neo4j-based GraphRAG, and async LLM pipelines (asyncio.Semaphore + ainvoke).

Built and operated these systems during 13 months of military service in the ROK Air Force Data Platform Team.

πŸ’Ό Recent Experience

Republic of Korea Air Force Β· Data Engineering Soldier
Intelligence Information System Management Group, Data Platform Team
Apr 2025 – May 2026

  • πŸ”Ž News Hybrid RAG + GraphRAG Search System β€” Airflow ETL Β· 3-signal Hybrid Retrieval (ES + Qdrant) Β· Neo4j GraphRAG Β· async LLM extraction
  • πŸ—„οΈ Internal Data Hub β€” Kotlin Spring Boot Β· KotlinJDSL Β· event-driven RDB↔ES sync Β· React + TS full-stack
  • πŸ’¬ Real-time Meeting Text Analytics β€” Spring/FastAPI split Β· Kiwi NLP Β· dual-token JWT (key_version + SHA-256/AES-GCM)

πŸ› οΈ Tech Stack

AI / Search
RAG GraphRAG LangChain Elasticsearch Qdrant Neo4j

Backend
Kotlin Spring Boot Python FastAPI PostgreSQL Oracle

Frontend / Ops
React TypeScript Docker Airflow

πŸ“« Contact

πŸ“§ yh47529722@gmail.com
πŸ”— LinkedIn

🚧 Currently building: open-source news hybrid search benchmark with retrieval evaluation (Recall@K, MRR, nDCG)

Popular repositories Loading

  1. kokoa-clone-2020 kokoa-clone-2020 Public

    Kokoa Clone 2020 Update

    HTML

  2. 2021_Spring_ArduinoStudy 2021_Spring_ArduinoStudy Public

    Forked from sejongsmarcle/2021_Spring_ArduinoStudy

    2021 1ν•™κΈ° SMARCLE 아두이노 μŠ€ν„°λ””/λ©˜ν† λ§ λ ˆν¬μ§€ν† λ¦¬

  3. yh4752.github.io yh4752.github.io Public

    Forked from mmistakes/minimal-mistakes

    πŸ“ Jekyll theme for building a personal site, blog, project documentation, or portfolio.

    SCSS

  4. kokoa-clone-2021 kokoa-clone-2021 Public

    Kokoa Clone 2021 Update.

    CSS

  5. new-gaetalk new-gaetalk Public

    Forked from gogang-with-children/new-gaetalk

    HTML

  6. gaegaotalk gaegaotalk Public

    HTML