Android App Development for Adults

I'm looking for an experienced Android developer to create an Android app targeted at adults. The app will require user authentication as a main functionality.

Ideal Skills and Experience:
- Proficiency in Android development (Java/Kotlin)
- Experience with implementing secure user authentication
- Knowledge of UI/UX design principles for adult users
- Familiarity with backend services for data management
- Strong debugging and problem-solving skills

Please provide examples of previous work and relevant experience.