Android Expense Tracking Bill Notes App

I'm seeking a proficient Android developer to create a compact yet efficient bill notes application. This app should primarily focus on expense tracking.

Key Features:
- The app should seamlessly track expenses, providing users with a clear view of their financial outgoings.
- It should also allow for expenses to be sorted, making it easier for users to manage their bills.

Data Export:
- A crucial aspect of this project is the app's ability to export data as a PDF. The export feature should be user-friendly and accessible.

Ideal Skills:
- Proficiency in Android app development
- Experience in creating expense tracking applications
- Ability to implement user-friendly data export options

Please include examples of prior relevant work in your proposal.