Gustavo worked on the lmtsufape/hvu repository, focusing on backend security and data model simplification using Java and Spring Security. He implemented role-based access control for protected API routes, ensuring that only users with MEDICOLAPA or SECRETARIOLAPA roles could access sensitive endpoints. To streamline the codebase and reduce maintenance overhead, Gustavo removed the LivroRegistro entity along with its related controllers, services, and repositories. All changes were consolidated into a single, traceable commit, reflecting a methodical approach. His work enhanced maintainability, reduced the risk of future bugs, and made onboarding easier by decreasing the code surface area and legacy complexity.