Sean Baccas focused on stabilizing CUDA test runs in the idaholab/moose repository by addressing instability in the test infrastructure. He resolved a persistent issue by switching test configurations from MFEMHypreGMRES to MFEMHyprePCG across CUDA-related setups, including mfem multiapps and timesteppers. This targeted change, implemented in C++ with expertise in high-performance computing and numerical methods, reduced test flakiness and improved the reliability of continuous integration feedback cycles. Sean’s work demonstrated careful debugging of complex test environments and precise Git-based change management, resulting in more deterministic validation and faster release cycles for CUDA-enabled code paths within the project.