Michael Welt focused on improving build stability for the ERGO-Code/HiGHS repository by addressing global constant redefinition issues in C++ projects. He modified highs_c_api.h to declare all global constants as static const, ensuring each constant is localized to its translation unit and preventing multiple-definition linker errors during cross-module integration. This targeted change enhanced build reliability and streamlined the developer experience, particularly in complex build systems. Michael’s work demonstrated a strong understanding of C++ header design, translation-unit semantics, and linker behavior, resulting in safer API usage and laying a foundation for more robust multi-module development in the codebase.