Developed a new configurability feature for NixOS within the Saghen/nixpkgs repository, enabling users to override the default Mosh package through the programs.mosh.package option. This addition allowed precise control over package versions and forks, supporting reproducible and reliable deployments across diverse environments. The work involved NixOS configuration and package management, leveraging the Nix language to implement module design and package override mechanisms. By aligning with established nixpkgs module conventions and maintaining clear commit practices, the solution improved flexibility for enterprise deployments and addressed the need for version pinning without introducing major bug fixes during the development period.