Cross-Platform Music App Development

I'm looking to build a comprehensive music app available on both iOS and Android platforms. The app should support music streaming, downloading, and social sharing.

Key features:
- Offline playback
- Playlist creation
- User ratings and reviews

Ideal skills and experience:
- Proven experience in developing music apps
- Strong knowledge of both iOS and Android platforms
- Expertise in implementing offline playback and playlist functionalities
- Experience with user-generated content features like ratings and reviews

Please provide examples of similar work done.