Zhwei Wei focused on enhancing the robustness of the HiGHS solver in the ERGO-Code/HiGHS repository by addressing a critical bug in clique merging logic. Through careful C++ development and in-depth software debugging, Zhwei ensured that fixed variables were correctly skipped during the merging process, preserving the integrity of optimization results. This work required a strong understanding of algorithm optimization and data structures, as the fix involved multi-commit changes to maintain correctness in edge cases. By improving the solver’s reliability for production workloads, Zhwei demonstrated attention to detail and a methodical approach to maintaining complex optimization software.