Janus focused on build system configuration for the simonmichael/stackage and commercialhaskell/lts-haskell repositories, addressing package compatibility and stability issues. Over two months, Janus restored the inclusion of the dimensional, geodetics, and dhall packages by removing restrictive constraints in YAML-based build configurations. This work involved updating build matrices and validating changes through continuous integration, ensuring that previously excluded packages were reliably incorporated into standard builds and release pipelines. By resolving these bugs, Janus improved package coverage and reduced the risk of broken builds for downstream dependencies, demonstrating depth in build system management and proficiency with YAML and CI workflows.