Yan worked on the Unity-Technologies/mono repository, focusing on enhancing debugging capabilities and improving Windows 64-bit build documentation. By implementing assembly-name capture in MonoStackFrameDetails using C and Perl, Yan enabled more informative stack traces, which support better diagnostics and developer productivity. The technical approach involved updating the stack frame details to include assembly file names, directly addressing the need for clearer error reporting. Additionally, Yan refreshed the Windows 64-bit build documentation to reference the correct build script, ensuring alignment with current workflows. The work demonstrated depth in build systems, debugging, and documentation, contributing to maintainability and reliability for ongoing development.