Roshan Yogi focused on stabilizing the Windows build of the fossasia/magic-epaper-app repository by addressing a critical bug in the Win32Window::WndProc function. Using C++ and leveraging his experience in Windows application development, he fixed a potential null pointer dereference that previously caused application crashes and unreliable window handling. His targeted patch, co-authored with Mario Behling, directly resolved issues #289 and #290, reducing the crash surface and improving the user experience for Windows users. The work demonstrated careful attention to regression risk and contributed to the project’s readiness for broader Windows testing and more reliable future releases.