Some key skills that are typically required to become a professional app developer include:
1. Strong programming skills, particularly in languages such as Swift (iOS) or Java (Android)

2. Knowledge of mobile development frameworks, such as React Native or Xamarin

3. Familiarity with software development concepts, such as object-oriented programming, MVC, and Agile development
4. Familiarity with mobile development tools, such as Xcode and Android Studio
5. Experience with version control systems, such as Git
6. Understanding of mobile design principles and user experience (UX) design
7. Good problem-solving and debugging skills
8. Strong written and verbal communication skills, as well as the ability to work well in a team
9. knowledge about cloud infrastructure, such as AWS or Firebase is a plus
10. Experience with native/hybrid apps development, third-party libraries, APIs, and other external services

It would also be beneficial for an app developer to stay up-to-date with new technologies and trends in the mobile development industry.

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