Cross-Platform Social Networking App Development

I need an experienced app developer to assist with finalizing a social networking app for both iOS and Android platforms.

The app will primarily serve as a social networking platform.

Core features to include:
- User profiles
- Messaging system
- Content sharing

Ideal skills and experience:
- Proven experience in developing social networking apps
- Expertise in both iOS and Android development
- Strong knowledge of user interface and user experience (UI/UX) design
- Ability to implement secure and efficient messaging systems

Please share your portfolio and relevant experience. Looking forward to your bids!