An Android application developer is a professional who is responsible for designing, programming, and developing mobile applications for devices that use the Android operating system. To perform their work, the developer must have knowledge of programming languages such as Java or Kotlin, and must be familiar with the Android software development kit (SDK).

The process of developing an Android application involves several stages, such as defining project requirements, designing the user interface, implementing programming logic, and conducting tests to ensure that the application functions properly. In addition, the Android application developer must stay up-to-date with the latest trends in mobile technology and be familiar with the best development practices to create high-quality applications.