About
Jina Kim
EXPERIENCE
Software Engineer @SK Hynix
Jan 2026 - Current
Software Engineer Intern @SAP Labs Korea
Jul 2024 - Dec 2025
Worked in HANA Core SQL Team
Extended the query optimizer in C++ to support a new SQL hint.
Developed AI SQL HINT Suggestion program utilizing LangChain and RAG with average 32.02% performance increase.
Developed a framework for redacting personal information from data inputs to LLM systems.
Software Engineer Intern @LG Electronics
Mar 2024 - Jun 2024
Worked in H&A Sound/Image Intelligence R&D Lab
Developed QE automation program for voice intelligence speakers.
Participated in AI speaker research.
Led Matter protocol seminars.
SNU Data Science Career Workshop (ExploreCSR Winter 2024)
Dec 2023 - Feb 2024
Built a full-stack news aggregation platform that crawls SNU newsclipping articles into a MySQL database on AWS EC2, serves them via a Node.js/Express backend, and displays them through a React frontend on Vercel, with daily cron jobs to keep content up to date.
PUBLICATIONS
Interpretable Prediction of Private Brand Purchases by Pet Type in E-Commerce for Consumer Behavior Analysis Using Real-World Transaction Data
Jaehyuk Lee*, Woojung Song*, Jina Kim, Yoona Chung, Eunchan Kim
PeerJ Computer Science 12 (2026)
Developed machine learning models to predict private brand purchasing behavior in pet e-commerce, identifying distinct decision-making patterns between dog and cat owners through explainable AI techniques.
The Impact of Code-Switching on LLM Response Quality: Focusing on Korean-Japanese
Hoyeol Yang, Jina Kim, Jungbin Song
Korea Computer Congress 2025
Systematically analyzed how Korean-Japanese language translanguaging affects LLM response quality using 1,548 MKQA queries, finding that replacing Korean particles and predicates with Japanese significantly improved GPT-4o performance while noun substitutions decreased quality.
B.F. SWORD: Blank inference system with optimized RAG and knowledge distillation
Junseong Pyo, Hyejin Bae, Kitae Kwon, Jina Kim, Woojung
Proceedings of HCI Korea 2025
Conducted research on developing an AI-assisted tool for generating CSAT(Korean College Scholastic Ability Test) English blank-filling questions using Large Language Model.
EDUCATION
Hanyang University - Department of Information Systems
Mar 2022 - Aug 2025
GPA : 4.39 / 4.50 (Summa Cum Laude)
ACTIVITIES
‘DBDBDip’ (Database) Study Mentor
‘디비디비딥’ 스터디 멘토
Mar 2025 - Jul 2025
Leading a study group on databases.
HSPC (Hanyang Sejong Programming Contest) Problem Setting Team
HSPC 한양대학교-세종대학교 알고리즘 대회 출제진
Sep 2024
Developed and reviewed problems for HSPC competitions, creating challenging and educational content for participants.
‘Do you believe me GPT?’ (LangChain, RAG) Study Mentor
‘GPT야 나를 믿니? 네~ 띰장님’ 스터디 멘토
Sep 2024 - Dec 2024
Led a study group on application development with LangChain and RAG, and secured 1st place in a hackathon competition.
HPEC (Hanyang Programming Evaluation Contest) Problem Setting Team
HPEC 한양대학교 알고리즘 대회 출제진
Sep 2023
Developed and reviewed problems for HPEC competitions, creating challenging and educational content for participants.
Specialized in creating problems with a focus on Graph Theory and Data Structures.
‘Why Frontend? Go Full Stack’ (Backend with Node.js) Study Mentor
‘프론트 해? 풀스택 해보자’ 스터디 멘토
Sep 2023 - Dec 2023
Led a study group on backend development using Node.js, culminating in securing 1st place in a hackathon competition.
‘I Became Your Boss with Python’ (Basic Python) Study Mentor
‘파이썬으로 내가 쟤 상사가 됐어’ 스터디 멘토
Mar 2023 - Jun 2023
Facilitated a study group focused on teaching basic Python skills, guiding participants through practical programming challenges and projects.
SKILLS
- TOEIC 980
- TOEFL 110
- TEPS 540
PERSONAL INTERESTS
Algorithms
Graph Theory, Data Structure
Mechanical Keyboards
Coffee