Crypto Exchange App Development

I'm seeking an experienced app developer to create a cryptocurrency exchange app. The app should facilitate the exchange of Bitcoin, Ethereum, Litecoin, and Solana.

Key requirements:
- Primary function: Exchange cryptocurrencies
- Supported cryptocurrencies: Bitcoin, Ethereum, Litecoin, Solana
- User authentication: Email and password

Ideal skills and experience:
- Proven experience in developing cryptocurrency exchange platforms
- Strong knowledge of blockchain technology and security protocols
- Proficiency in mobile app development (iOS and Android)
- Experience with user authentication methods

Please provide examples of similar projects you've completed. Looking forward to your proposals!