Rafael Rubio Carnes focused on backend development for the Maua-Dev/reservation_mss_user repository, where he streamlined the environment configuration by removing observability functionality. Working primarily in Python, Rafael eliminated the get_observability static method and its related imports, updating both the presenter and associated tests to reflect this change. This refactoring effort simplified the setup process and reduced ongoing maintenance risks, aligning the codebase with updated product requirements. His work demonstrated careful attention to code cleanliness and traceability, ensuring that all changes were well-documented and robust. The depth of the update reflects strong backend engineering skills and disciplined development practices.