An / developer creates and modifies the structure and appearance of web content using and languages. They design user-friendly, interactive websites ensuring browser compatibility, implementing responsive design principles for optimal viewing on various devices. They also manage site updates and fixes, follow SEO best practices, and collaborate with designers and developers to maintain the aesthetic and functional aspects of the website. Additionally, they may conduct website performance tests, debug issues, and improve loading speeds. Understanding JavaScript, jQuery, or other scripting languages may also be part of their role for dynamic web content creation.