Testing and debugging:iOS and Android developers test their applications to ensure they are functioning correctly, and they debug any issues that arise. They may use tools such as Xcode and Android Studio to identify and fix bugs in their code.

Collaborating with other teams: iOS and Android developers work closely with other members of the mobile development team, such as designers and product managers, to ensure that the mobile application meets the needs of its users.

Staying up to date with the latest technologies: iOS and Android developers stay up to date with the latest technologies and trends in mobile application development, and incorporate these into their applications where appropriate.

App store submission and maintenance: iOS and Android developers are responsible for submitting their applications to the App Store and Google Play Store, and for maintaining them once they are released.

To become an iOS or Android developer, one typically needs a strong foundation in programming languages such as Swift, Objective-C, Java, and Kotlin, as well as experience with mobile application development frameworks such as UIKit and Android SDK. A degree in computer science or a related field is often required, along with relevant work experience. Additionally, certifications such as the Apple Developer Certification or Android Developer Certification can be helpful in demonstrating expertise in iOS or Android development.