A Java NetBeans developer designs, builds, and maintains Java applications using the NetBeans Integrated Development Environment (IDE). They write efficient, scalable, and reusable Java code while ensuring the software complies with design specifications. Their tasks also involve debugging and resolving technical issues, integrating and managing databases, and utilizing the NetBeans IDE for code completion, smart code analysis, and quick fixes. They may also collaborate with other software developers, participate in code reviews, and contribute to the software development lifecycle. They need to stay updated with Java development trends and the evolving features of the NetBeans IDE.