Backend Engineer at Lunit Inc.

Developed scalable backend systems integrating AI models for cancer detection using medical X-ray images, ensuring reliable data processing, storage, and smooth data flow between AI and clinical applications. Created an internal OAuth 2.0 authentication server and implemented FDA-compliant data collection and analysis of user interaction logs to evaluate AI model effectiveness, supporting regulatory approval for medical AI software. Collaborated with AI researchers and frontend teams to integrate machine learning models into backend services. Utilized Kotlin (Spring), Python, PostgreSQL, AWS, and Docker to architect and integrate scalable backend systems for seamless AI model deployment.

Game Programmer at Pearl Abyss Corp.

Developed and maintained real-time cross-platform MMORPG UI and gameplay systems on a proprietary engine using C++ and Lua, delivering responsive user experiences on PC, PlayStation, and Xbox. Incorporated user feedback to refine gameplay and system design, gaining insights into human-computer interaction (HCI). Built strong expertise in real-time rendering and complex system integration applicable to immersive AR/VR environment development.

Full-stack Developer at Restaurant Ordering System Development

Developed frontend using Next.js and backend with NestJS. Designed and managed PostgreSQL database. Built and operated AWS infrastructure utilizing EC2, RDS, and S3. Implemented integrated order and payment system. Communicated in English with local Australian store owners to incorporate user requirements. Developed real-time order notification service for Android app.

Pearl Abyss Client Programmer at Pearl Abyss

Maintained and extended client systems for a large-scale MMORPG. Developed user interface systems for multiplayer features and analyzed engine APIs for stability and performance.