A Jetty Developer works with the Jetty web server, a Java HTTP server and servlet container that can serve static and dynamic content. They are responsible for implementing, configuring, and managing applications within this server environment. They develop and deploy Java applications, troubleshoot issues, optimize performance, and ensure security. They must also have knowledge of Java Servlet API, HTTP protocols, and web technologies. Additionally, they often work with other web technologies and databases, integrating them with Jetty. Their goal is to create efficient, scalable, and reliable web applications or services. They may also create and maintain technical documentation.