Social Network App Development

I'm seeking a mobile app expert to develop a social networking app for both iOS and Android platforms. The primary function of the app will be user interaction, allowing users to post, comment, and like content.

Key features:
- User interaction: posts, comments, likes
- Content sharing: photos, videos
- Messaging and chat functionality
- User authentication: email/password, social media logins, phone number verification

Ideal Skills and Experience:
- Proven experience in mobile app development for iOS and Android
- Strong background in building social networking features
- Expertise in implementing secure user authentication
- Familiarity with UI/UX design principles for a seamless user experience
- Ability to work within budget constraints and deliver on time

Please provide a portfolio showcasing similar projects.