Cross-Platform Betting Tracker App

I'm seeking an experienced developer to create a cross-platform application for both iPhone and Windows. The app will be used to track betting profits and losses across multiple sports and racing types, providing both individual and collective performance views.

Key Features:
- Support for various sports (NRL, AFL, MLB, NFL, NBL, NBA, NHL) and racing (Harness, Gallops, Greyhounds)
- Auto-lodge bets from all betting platforms (Tab, Ladbrokes, Tabtouch, Picklebet, Betfair, Sportsbet)
- Multiple user accounts with secure authentication via email and password
- Comprehensive data visualization using line graphs, bar charts, and pie charts

Ideal Skills and Experience:
- Proficiency in cross-platform app development
- Experience with secure authentication protocols
- Strong data visualization skills
- Familiarity with various betting platforms and APIs

Please share your relevant experience and approach.