An Android developer specializes in designing and programming applications for Android, the mobile operating system developed by Google. They use the Android Software Development Kit (SDK) and programming languages like Java or Kotlin. Their tasks include creating user interfaces, coding application functionalities, debugging and troubleshooting, ensuring compatibility with different Android versions, and integrating with backend systems. They also collaborate with designers and testers to optimize user experience and application performance. Furthermore, they are responsible for maintaining and updating the application after its deployment, addressing any issues, and adding new features as needed.