During November 2025, Seob worked on the TanStack/virtual repository, focusing on stabilizing the masonry layout during viewport resizing. He addressed a critical bug where items would jump between lanes by introducing a lane assignment caching mechanism, ensuring that assignments persisted correctly through dynamic viewport changes. His approach included robust cleanup and recalculation logic, which reduced layout jitter and improved visual stability for end users. Utilizing TypeScript and applying front end development and performance optimization skills, Seob’s work enhanced the perceived performance of the layout. The depth of the solution demonstrated careful attention to both user experience and maintainable engineering practices.