Performed a technical audit of a Next.js/React website and implemented a set of SEO, stability, and UX improvements. Configured redirects, canonical URLs, sitemap.xml, robots.txt, hreflang, localized 404 pages, and language switching behavior. Added and validated schema.org structured data for key pages, fixed navigation, anchor links, external booking links, and restaurant menu links. Also implemented frontend improvements for the mobile version, booking flow, menu sections, blog pages, and several user experience scenarios.