Target was to create a simple Registration App in Android.

• Registration Form with Name, Email and Birthday Validation
• Confirmation Screen with Registration Information
• Persist Registration Data securely in the App
• Load persisted name and email and set it in Registration View (exception for birthday)

• Data Binding
• LiveData
• Hilt
• EncryptedSharedPreferences

Due to the limited time, the solution is not yet perfect.

• Currently Error Messages are defined in Constants, better to move them to String ressources to also make them localizable.
• There are no InstrumentedTests yet, compared to Unit Tests, InstrumentedTests are more time intensive to write and offer less benefit, with more time -> write Instrumented Tests.
• Live Input Validation, instead of only validating the user input when clicking on the button, we could validate on typing.
• Organise Dependencies better, introduce versions.gradle file.
• Layouts and drawables currently in one folder, create sub folders.
• Kotlinx.Serialization is still experimental had to add @OptIn(ExperimentalSerializationApi::class) Annotation, maybe using Jackson or GSON would be better.
• Working with more Interfaces, it makes sense, to work with more interfaces, specially in the domain and data layer.
• We persist the Registration data name, email and birthday and set it, when restarting the App after a successful registration. To still be able to test the birthday validator, the birthday is not set.

There might be more improvements, which we can discuss in the Interview.