Cross-Platform Social Networking Development

I'm seeking an experienced web and app developer to create a comprehensive social networking platform. The platform should support web, iOS, and Android.

Core features must include:
- User Profiles
- Messaging
- Content Sharing

Ideal skills and experience:
- Expertise in cross-platform development
- Strong background in social networking apps
- Experience with user authentication and real-time messaging systems
- UI/UX design skills for seamless user experience

Looking forward to your proposals!