Else contributed to several Nix-based repositories, focusing on system packaging, dependency management, and documentation. In hmemcpy/nixpkgs, Else refactored CUDA package compatibility logic, improving platform reporting and dependency validation using Nix and C++, which reduced build errors and streamlined review processes. For srid/nixpkgs, Else upgraded the Polars Python package, updating build scripts and dependencies to ensure stability and future-proofing, leveraging Rust and Python for integration and testing enhancements. In NixOS/nix, Else clarified documentation for experimental features, improving onboarding and system feature transparency. The work demonstrated depth in build systems, DevOps, and governance, resulting in more reliable and maintainable codebases.