Cross-Platform Social Networking App Development

I'm seeking an experienced app developer to create a social networking app available on iOS and Android platforms. The app should include:

- User Profiles
- Messaging System
- News Feed
- File Sharing (Photos, Videos)
- Additional Features (to be discussed)

Ideal skills and experience:
- Proficient in mobile app development for iOS and Android
- Strong experience in building social networking platforms
- Knowledge of secure messaging and file sharing protocols
- UI/UX design skills for an intuitive user experience
- Ability to integrate additional features based on project requirements

Please provide examples of previous work, especially in social networking apps. Looking forward to your proposals!