Social Networking Web App Development

I'm seeking a skilled web app developer to create a comprehensive social networking platform. The app should serve as a marketplace and an open-world business space, integrating various marketplace functionalities in one accessible location.

Key features to include:
- User profiles
- Messaging system
- News feed

Ideal Skills and Experience:
- Expertise in developing scalable web applications
- Experience in social networking and marketplace integrations
- Strong background in cloud infrastructure management
- Proficient in UX/UI design for optimal user engagement
- Familiarity with security protocols to protect user data

Please provide examples of similar projects completed and your approach to ensure scalability and security.