Zhanjiahui focused on backend and API development in TypeScript, contributing to the daytonaio/daytona repository during April 2026. Their primary work involved stabilizing sandbox lifecycles by addressing a critical bug that affected the reliability of sandbox startup states. Zhanjiahui implemented a fix to reset the backup state during v2 sandbox start, create, and recover operations, ensuring each sandbox instance began from a clean state and eliminating issues caused by residual backup data. This targeted solution improved the predictability and reliability of sandbox runs, particularly in CI and development workflows, reflecting a thoughtful approach to system stability and maintainability.