A Markdown developer utilizes the lightweight markup language called Markdown to create content for the web. This involves writing text with embedded instructions for formatting, such as headers, links, emphasis, lists, and more. They convert this simple, readable text into valid HTML. Markdown developers often work on content management systems, documentation, blogs, books, or any platform that requires formatted text. They also integrate with version control systems like Git. Their work enables non-technical users to maintain and update web content without knowing complex HTML or CSS, ensuring the content remains accessible and easily editable.