Otavio worked on the senacscsrs/primeiroano2025 repository, focusing on establishing foundational scaffolding for new web features over a two-month period. He created the initial User Profile section by setting up a dedicated directory and placeholder HTML, ensuring a maintainable structure for future UI and UX integration. In addition, Otavio delivered site-wide navigation, header, and footer components, introducing reusable layouts and CSS groundwork to support scalable development. He also addressed code maintainability by fixing formatting issues in the HTML. His work demonstrated a methodical approach to front-end development using HTML and CSS, laying a solid base for subsequent feature expansion.