Cross-Platform Car Expense App

I'm seeking a skilled app developer to create an expense reporting app for car-related costs. The app should be available on both iOS and Android platforms.

Key Features:
- User-friendly interface for easy logging of expenses
- Categorization of expenses (fuel, maintenance, etc.)
- Visual reports and summaries of spending
- Data backup and sync across devices
- daily, monthly and yearly expenses reports

Ideal skills and experience:
- Proven experience in mobile app development for both iOS and Android
- Strong UI/UX design capabilities
- Experience with data visualization and reporting tools
- Familiarity with cloud services for data backup and sync

Please provide detailed project proposals in your application.