Worked on the root-project/root repository to modernize legacy C++ code through a targeted cross-platform safety and robustness refactor. The approach focused on replacing unsafe constructs, such as obsolete sprintf() calls, with safer alternatives to reduce buffer overrun risks and undefined behavior. This refactoring improved code portability and reliability across platforms, establishing a safer baseline for future maintenance and updates. Emphasizing modern C++ practices, the work enhanced code quality by clarifying separation of concerns and simplifying code reviews. The changes contributed to lower maintenance costs and enabled faster iteration for safety-critical features, demonstrating strong skills in C++ and cross-platform development.