Music Lobby App Development

I'm seeking an experienced mobile app developer to create WeMix, a unique music-sharing app.

Key Requirements:
• QR code generation and scanning for lobby joining
• OAuth2 cross-platform login integration with both Spotify and Apple Music
• Playlist selection and song submission from users' accounts
• Song ranking based on user frequency
• Host playback from their own account only
• Genre filtering for submitted playlists
• Ad-supported free version, with an option for a premium ad-free version
• Basic user creation after QR scan required
• Preferred use of Firebase or similar for backend

Technical Preferences:
• Mobile app development using Flutter or React Native
• Support for both iOS and Android platforms

Ideal Skills and Experience:
• Proficiency in mobile app development (Flutter/React Native)
• Strong background in OAuth2 authentication
• Experience with Firebase or similar backend services
• Familiarity with QR code generation and scanning integration
• Understanding of ad integration in mobile apps

Please provide a portfolio showcasing relevant experience.