Worked on the Trilinos repository to enhance the stability and maintainability of the Ifpack2 package by reverting the Schur sublines logic to an iterative, cost-based approach. This adjustment replaced a previous empirical heuristic that relied on linear regression, restoring robust and predictable behavior for Schur decompositions across diverse matrix types. The change improved numerical stability and reduced the risk of performance regressions, while also simplifying the underlying logic for easier maintenance. Demonstrated expertise in high-performance computing, numerical analysis, and C++ by implementing these changes, focusing on solver component reliability and effective version-control practices throughout the development process.