Cross-Platform Social Networking App Development

I'm seeking an experienced mobile app developer to create a cross-platform social networking application for both iOS and Android.

Key Requirements:
- User-friendly interface
- Secure user authentication
- Profile creation and management
- Real-time messaging and notifications
- Content sharing (images, videos, posts)
- Search and discovery features
- Integration with existing social media platforms
- Robust backend to support high traffic

Ideal Skills and Experience:
- Proven experience in mobile app development for both iOS and Android
- Strong knowledge of social networking app functionalities
- Expertise in UI/UX design
- Proficient in backend development and database management
- Familiarity with security protocols and data protection
- Excellent communication skills

Please provide a portfolio of similar projects and your approach to this development.