During a one-month engagement, Fergus upgraded the casacorecxx package to version 0.4.0 within the JuliaPackaging/Yggdrasil repository, focusing on enhancing Julia interoperability. He refined build automation processes by adjusting dependency management and package management configurations, ensuring unsupported architectures were excluded and Julia version compatibility was strictly enforced. Fergus improved the reliability of continuous integration by tightening architecture filtering and version checks, reducing the risk of regressions. His work demonstrated a methodical approach to maintaining cross-language compatibility and robust build pipelines using Julia and related tooling. The depth of his contributions addressed both immediate integration needs and long-term maintainability concerns.