Felix Del Val developed a Sitemap Index feature for the hlxsites/24petwatch repository, focusing on enhancing SEO and website optimization. By leveraging XML and SEO best practices, Felix enabled search engines to efficiently discover and index individual sitemaps, improving content visibility and supporting scalable sitemap management. The work emphasized commit-driven development and thorough QA, ensuring no major regressions were introduced. Although the project scope was limited to one feature over a month, Felix’s approach demonstrated a clear understanding of SEO-focused engineering and the importance of traceable, maintainable code. This contribution laid a foundation for future SEO improvements and site scalability.