A mobile website development developer designs, builds, and maintains websites optimized for mobile devices. They ensure the site's layout, images, and functionalities are responsive and adaptable to various screen sizes. They write code, primarily using languages like HTML, CSS, JavaScript, and sometimes server-side scripting languages. They incorporate SEO best practices to improve site visibility. They also test the website across multiple browsers, operating systems, and devices to ensure compatibility and performance. Furthermore, they troubleshoot and fix bugs to enhance user experience. They usually work closely with designers and other developers to meet the project's objectives.