A (Java Micro Edition) developer specializes in designing, implementing, and maintaining applications for micro devices like mobile phones, set-top boxes, or industrial machinery. They use Java programming language to create apps that are efficient, scalable, and compatible with a variety of small devices. Their responsibilities include understanding client requirements, writing reusable and testable code, debugging, ensuring software compatibility, and improving application performance. They also work closely with other team members to integrate their applications with other systems. Additionally, they stay updated with the latest industry trends to ensure the developed applications meet current standards.