A web developer specializes in creating, programming, and maintaining websites and web applications. She works on both frontend development, which focuses on the design and usability of the website, and backend development, which handles data processing and functionality. Her tasks include writing code in various programming languages such as HTML, CSS, JavaScript and PHP, as well as implementing content management systems (CMS) like WordPress or TYPO3. A web developer needs to have technical expertise and the ability to develop user-friendly and high-performing solutions optimized for various devices.