Southeast Asia Multi-Currency QR Wallet

I need a QR wallet app developed for iOS, Android, and Web platforms. This wallet will cater primarily to Southeast Asia users and must support multiple currencies.

Key features:
- User authentication
- Transaction history
- Balance check

Ideal skills and experience:
- Proficiency in mobile and web app development
- Experience with multi-currency financial applications
- Strong understanding of user authentication and data security protocols

Please provide a portfolio with similar projects.