Cross-Platform Chat App Development

I'm seeking an experienced developer to create a chat application for both Android and iOS platforms.

Key Features:
- Text messaging
- Voice calls
- Video calls
- Mobile verification for user authentication
- Media sharing (images and videos)

Ideal Skills and Experience:
- Proven experience in developing cross-platform mobile applications
- Strong knowledge of real-time communication technologies
- Experience with secure mobile verification processes
- Ability to implement media sharing functionalities
- Familiarity with both Android and iOS design guidelines

Please provide your portfolio and relevant experience.