Yuka focused on stabilizing and maintaining critical infrastructure in open source projects, addressing dependency and compatibility issues in both mongodb-js/mongosh and Mic92/nixpkgs. In mongosh, Yuka resolved an npm package-lock integrity problem by restoring missing fields and validating lockfile formatting, ensuring reproducible builds and reducing CI risk using JSON and npm tooling. Later, in nixpkgs, Yuka reverted a storage provider version to maintain compatibility with matrix-synapse, updating Nix expressions and hashes to guarantee reliable Matrix deployments with S3 storage. The work demonstrated depth in package management and system configuration, prioritizing long-term stability and reproducibility over rapid feature delivery.