Kotlin Android Developer for Google Sheets App

I'm in need of a seasoned Kotlin Android developer. The goal is to construct an application that will:

- Allow manual data entry from the user
- Update existing rows in Google Sheets
- Both add and update mixed data (text and numbers)

The application should seamlessly integrate with Google Sheets and offer a smooth user experience. Ideal candidates should have:

- Extensive experience in Kotlin and Android development
- Previous experience with Google Sheets integration
- Strong UI/UX skills for a user-friendly application