Worked on the trilinos/Trilinos repository to enhance the build system by replacing the use of ADD_CUSTOM_COMMAND with CMake’s configure_file for copying specific C++ source files. This approach streamlined the build process, ensuring consistent file copying across various test configurations and reducing the potential for fragile logic in the build scripts. The update improved continuous integration reliability and simplified maintenance by centralizing source-copy operations within CMakeLists.txt. Demonstrated expertise in build systems, C++ development, and CMake, focusing on configuration management and maintainability. No major bugs were addressed during this period, with efforts concentrated on feature development and build optimization.