Henry improved testing reliability and streamlined CI/CD processes in the DUNE/MaCh3_DUNE repository by standardizing event rates test configurations and refining build system management. He introduced a shared configuration file and new test options using CMake and YAML, which enhanced the flexibility and consistency of test runs. Additionally, Henry cleaned up build and test configurations, removing redundant files and correcting build arguments to ensure more predictable and maintainable releases. His work leveraged skills in C++, configuration management, and automated testing, resulting in faster feedback cycles for developers and reduced maintenance overhead, demonstrating thoughtful attention to both code quality and process efficiency.