Worked on the NixOS/nixpkgs repository to revert the Package URL (pURL) support in the stdenv module, restoring the previous package fetch behavior and removing pURL metadata and logic from core fetchers such as fetchgit, fetchgithub, fetchpypi, and gem. This effort involved updating and pruning related documentation to align with the changes, thereby reducing the metadata surface area and mitigating downstream risks for users and tooling. Leveraged expertise in build systems, package management, and the Nix language to stabilize package fetch flows, ultimately decreasing maintenance overhead and improving the reliability of the package management infrastructure within the project.