Global Community WebApp Development

I'm looking for a skilled web developer to create a web app that serves as a global community platform. This platform should be accessible from both mobile and desktop devices, and it should allow users to:

- View a directory of other users
- Communicate through a preformatted chat
- Access a location-based directory
- See a detailed description of any user
- Search for any user via their unique ID

The app should facilitate user interaction and updates, mirroring a social networking platform. Users should be able to contribute to the community by posting updates, which will be visible to other users.

Key Features:
- User authentication via phone number
- Ability for users to post text updates, upload images, and share video content

Ideal Skills and Experience:
- Proficiency in web development with experience in creating interactive, user-centric platforms
- Familiarity with mobile and desktop web app development
- Experience implementing secure user authentication systems
- Ability to create integrated chat features
- Experience with location-based services

Please provide a portfolio of similar projects you have completed.