Offline Android Checklist App

I need an Android application for maintenance task checklists. This app should work offline and allow users to save checklists as PDFs.

Essential Features:
- User authentication
- Offline functionality
- Save checklists as PDFs

Ideal Skills:
- Android app development
- Experience with offline data storage
- PDF generation integration
- User authentication implementation

Looking for an experienced developer to bring this project to life.