Cezar worked on UX improvements and routing infrastructure for the petcau/ProjetoBrinqueAprenda repository, focusing on enhancing user interaction and navigation. He implemented an interactive image cursor cue using CSS and React, allowing users to easily identify clickable images, which improved overall usability. Additionally, Cezar established the routing groundwork for four distinct games by leveraging React Router and updating the GameCard component to support seamless navigation between game routes. His work laid a solid foundation for future feature development, demonstrating depth in front end development and thoughtful integration of JavaScript, JSX, and CSS to address both user experience and codebase scalability.