Pedro Mass enhanced the chess-dojo-scheduler repository by implementing a date-time picker feature for activity submissions, focusing on improving scheduling accuracy and user experience. He replaced the existing date picker with a more precise date-time picker, allowing users to edit both the date and time of their submissions. Using React and TypeScript, Pedro streamlined the frontend by removing redundant labels and helper text, which reduced UI clutter and improved clarity. His work emphasized maintainable, traceable commits and clear frontend architecture. Over the course of one month, Pedro concentrated on frontend development, delivering targeted improvements without addressing bug fixes during this period.