Cross-Platform Social App Development

I'm seeking an experienced app developer to build a cross-platform social networking app.

The app will include core features such as:
- User Profiles
- Messaging System
- News Feed

Ideal candidates should have:
- Proven experience in developing cross-platform apps
- Expertise in social networking functionalities
- Strong UI/UX design skills
- Familiarity with both iOS and Android platforms

Please provide a portfolio with relevant work.