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How to become a mobile application developer
Try a computer science degree.
While a degree in computer science is not strictly necessary, it can give you a foundation for the field. Plus, many companies will prefer you have at least a bachelor's degree in computer science if they are going to hire you on as a developer.
If you can, try specializing in mobile application coding while you are in school. Other degrees in relevant fields can also help, such as in software development.