- Reconstructed the entire processing pipeline for a large-scale image-text pair dataset and trained the image-to-text model, Karlo 2.1, using the improved dataset.- Led the Mobile Vision Team, which developed and maintained a cross-platform, real-time video processing SDK. The SDK, previously integrated into KakaoTalk's video call feature, supports background blur/replacement and blendshapes-based face retargeting to characters, similar to Animoji. The core models were trained using in-house datasets, and the blendshapes model for face retargeting utilized only single camera frames as input.- Researched a lightweight human pose estimation model for real-time processing on mobile devices and developed an iOS SDK using the model, achieving quantitative improvements in both latency and accuracy over the models provided by Apple and Google at the time.- Developed and maintained a human pose estimation model API using Kubernetes, Flask, Celery, and Triton Inference Server, which was made public on Kakao Developers.

- Researched a deep learning model that generates whole Korean fonts using only a few hundred of Korean characters. The researched model became the foundation of the service "Ownglyph". Worked as a project manager- Researched deep learning models that generate filters suitable for each of night photographs, and developed an Android app that runs the model. Worked as a project manager

- Developed and maintained Kakao Account that provides account management features and authentication for Kakao services and third parties- Architected and developed an abuser detection system that collects logs from app servers and analyzes it to find and penalize abusers

- Co-founder, lead of software engineering- Developed and maintained HotPick, an innovative mobile shopping service that automates international online shopping, offering hot deals from 25 U.S. online stores- Architected and implemented Android app, scrappers and automated purchase process based on CasperJS, and Django backend server

- Developed the GolfStar online golf game for PC, contributing to successful launches in three countries- Took charge of optimization, troubleshooting, integrating and managing several game security solutions, and development of file system and client patch system in addition to the general game client development- Substitute for military service