Contractor Expense Tracker App

I need an Android app to track expenses, staff attendance, and material receipt details for my contracting company.

Key Features:
- Daily expense logging
- Expense categorization
- Staff attendance: clock-in/clock-out tracking and overtime calculation
- Details on materials received

Ideal skills and experience:
- Experience in Android app development
- Background in creating expense tracking and attendance monitoring features
- UI/UX design skills for a user-friendly interface
- Ability to integrate various functionalities seamlessly

Please provide a portfolio showcasing similar work.