Worked on stability and security improvements across Esri/harfbuzz and microsoft/git repositories, focusing on targeted bug fixes and feature enhancements. Addressed a memory leak in the HarfBuzz CoreText integration by refining memory management in C++ and Shell, which improved rendering stability for long-running processes. In the microsoft/git project, enhanced the git-subtree script by implementing robust argument parsing and adding GPG-sign support for subtree operations, increasing both reliability and commit verifiability. Demonstrated strong skills in bug fixing, Git workflows, and shell scripting, delivering isolated, low-risk patches that facilitated straightforward review, testing, and integration into existing codebases over a two-month period.