Technical SEO and Multilingual Website Update

I am looking for an experienced website developer to update an existing media website without redesigning or rebuilding it. The work includes implementing an existing SEO plan, improving headings and navigation, adding missing metadata and structured data, fixing crawlability and technical issues, setting up website translations correctly, and connecting all newsletter signup points to a new Brevo landing page and contact list. The developer should be able to work with the existing code, create a staging version, test changes on desktop and mobile, and provide a record of all completed updates. Please include examples of similar technical SEO, multilingual, and Brevo integration projects.