Worked on build system configuration for the simonmichael/stackage and commercialhaskell/lts-haskell repositories, focusing on restoring package compatibility and stability. Addressed issues by re-enabling the dimensional and geodetics packages in the build matrix, removing exclusion constraints, and validating these changes through continuous integration to improve release readiness. In lts-haskell, restored Dhall package compatibility by updating build-constraints YAML and removing restrictive version bounds, ensuring reliable builds for downstream packages. Utilized YAML for configuration management and applied systematic troubleshooting to resolve build failures. The work emphasized careful dependency management and contributed to maintaining robust, up-to-date package coverage across both projects.