A Java ME developer specializes in building applications for mobile and embedded devices using Java Micro Edition (Java ME), a subset of the Java platform tailored for small devices. They design, develop, test, and maintain applications, ensuring optimal performance, quality, and responsiveness. Their tasks include writing efficient, reusable, and reliable Java ME code, debugging to identify and fix software defects, and integrating user-facing elements with server-side logic. They may also work on software documentation, version control, and software updates. Understanding of device limitations, security aspects, and user interface design for limited display sizes is crucial for their role.