A Java Servlets developer designs and builds web-based applications using Java Servlet technology. They are responsible for creating dynamic web content, managing client-server communication, and handling HTTP requests and responses. Their tasks include writing server-side code, integrating front-end components, debugging applications, and maintaining database connectivity. They also ensure the security and scalability of applications, collaborate with other team members to develop high-quality software solutions, and often deal with session management. Additionally, they might be involved in updating existing applications to improve performance or add new features. They must always stay updated with the latest industry trends and technologies.