Worked on build stability and touchscreen testing across google/perfetto and puppeteer/puppeteer repositories over a two-month period. In google/perfetto, addressed CI reliability by correcting the include order of Psapi.h and Windows.h in C++ code, resolving Chromium bot build failures and reducing flaky builds. Disabled clang-format for the affected block to maintain header order and safeguard future stability. Later, contributed to puppeteer/puppeteer by enhancing touchscreen test robustness, explicitly setting large HTML heights and adding detailed pointer events using TypeScript and HTML. Focused on build systems, front-end development, and testing, delivering targeted improvements to code hygiene and test accuracy.