David Morcillo modernized animation handling in the factorialco/factorial-one repository by migrating Motion API usage to the new motion.create approach within the OneDataCollection and OverflowList components. He focused on refactoring legacy code to align with the latest library versions, removing deprecated motion patterns while carefully preserving existing animation behaviors to avoid user experience regressions. Working primarily with React, JavaScript, and TypeScript, David’s changes improved maintainability and reduced future upgrade risks for motion-related UI elements. His disciplined approach ensured downstream consumers would benefit from enhanced compatibility, and the work demonstrated a strong emphasis on code quality and forward-looking frontend development practices.