Jefferson Pessoa worked on the EduCompBR/educompbrasil-site repository, focusing on improving the accuracy of event information for Campo Grande, MS. He identified and corrected incorrect location references, ensuring that all mentions of Juiz de Fora, MG were updated to Campo Grande, MS. Using his skills in Handlebars, HTML, and CSS, Jefferson also revised transportation details and cultural highlights to provide more reliable data for event discovery and attendee planning. His work involved careful data verification and traceable commits, resulting in a targeted bug fix rather than new feature development. The scope was precise, addressing a specific data integrity issue.