Cross-Platform Social Networking App Development

I'm seeking an experienced app developer to create a social networking app for both iOS and Android platforms.

Core features include:
- User profiles
- Messaging system
-Setting up in person appointment system

Ideal skills and experience:
- Proven background in developing social networking apps
- Expertise in cross-platform development
- Strong UI/UX design skills
- Familiarity with backend technologies for messaging systems

Please provide portfolio and relevant experience in your bids.