During March 2026, Ph.Ds focused on backend development within the dotnet/msbuild repository, addressing a workflow issue related to build artifact preservation. He implemented a targeted bug fix in C# that modified the ProcessExit cleanup logic to respect the MSBUILDPRESERVETOOLTEMPFILES environment variable. This change ensured that temporary build files are retained when requested, enabling developers to inspect post-build artifacts for debugging and analysis without manual intervention. By enhancing the debuggability of the build process and supporting workflows reliant on artifact retention, Ph.Ds contributed to the reliability goals of the build system, demonstrating depth in C# and backend engineering practices.