Worked on the Shopify/nixpkgs repository to enhance the reliability of build systems by addressing a specific unpacking issue. Focused on system administration and shell scripting, the developer removed the --preserve=mode flag from the cp command in the defaultUnpack process. This change prevented errors related to unsupported extended attributes when copying files between filesystems such as NFSv4 and Ext4, while maintaining correct permission bits. The solution improved the robustness of the unpacking workflow without introducing new features, demonstrating careful attention to cross-filesystem compatibility and traceable commit practices. The work reflects a pragmatic approach to maintaining stable build environments.