Worked on the IBM/velox repository to improve the reliability and determinism of the build and continuous integration process. Addressed an issue where DWIO tests were unintentionally built whenever GPU support was enabled, regardless of the intended testing configuration. By gating the DWIO test builds behind the VELOX_BUILD_TESTING flag and restructuring the tests into a dedicated subdirectory, ensured that tests are only built when explicitly enabled. This targeted fix, implemented using C++ and CMake with a focus on build system and CI/CD practices, reduced unnecessary CI time and aligned the build process with the project’s intended testing configuration.