Andrew Pennell focused on stabilizing cross-platform ARM64 continuous integration for the microsoft/libHttpClient repository, addressing a critical issue in the test automation workflow. He resolved a bug in the TAEF test build process by correcting the library path during the linking phase, which enabled reliable execution of tests on ARM64 platforms. This work improved CI reliability and expanded platform coverage, ensuring that ARM64 environments are properly validated. Andrew applied his expertise in build systems and CI/CD pipelines, working primarily with XML to configure and manage the build process. The contribution demonstrated targeted problem-solving and a deep understanding of cross-platform build challenges.