Alex Chan contributed to the facebook/sapling repository over a two-month period, focusing on front end development and user experience improvements using React, CSS, and TypeScript. Alex enhanced commit workflows by introducing contextual highlighting for right-clicked commits and adding explicit submit controls, streamlining the process for both standalone and stacked commits. They improved dark mode support by refining scrollbar theming for visual consistency across browsers and addressed usability by preventing unintended text selection during multi-select operations. The work demonstrated a thoughtful approach to state management and UI clarity, resulting in features that reduced friction and improved the efficiency of developer interactions.