A developer designs, develops, implements, and maintains enterprise-level applications using Java Enterprise Edition (). They develop robust and secure software solutions for web applications, web services, and databases. They utilize frameworks like Spring, Hibernate, or Struts, and work with markup languages like HTML and XML. They also ensure the performance, quality, and responsiveness of applications. Debugging, troubleshooting, and improving application functionalities are part of their responsibilities. They often collaborate with other team members, such as UI designers and software testers, to ensure the applications meet the clients' requirements and expectations.