Mauro Bazan developed a dynamic promotional banner feature for the hlxsites/24petwatch repository, focusing on enhancing marketing flexibility within the website header. He implemented the banner using JavaScript, HTML, and CSS, enabling it to load dynamically and allowing users to close it, with the closed state persisting via localStorage. The solution was integrated across both paid and general header components, ensuring consistent UI/UX and styling. By allowing marketing campaigns to be configured without code changes, Mauro’s work reduced deployment cycles and improved responsiveness. The project demonstrated solid frontend engineering depth, particularly in component integration and state management for real-world applications.