Custom Messaging App Development

I'm in need of a skilled developer to create a messaging app with unique features that set it apart from existing apps like WhatsApp.

Key Features:
- Voice and video calling
- Group chats
- End-to-end encryption
- Status and news updates
- Health tracking capabilities

Target Audience:
- Teenagers
- Professionals
- Elderly

Platform Specifications:
- iOS
- Android
- Web
- PC

The chosen developer should have prior experience in developing messaging apps, as well as the ability to implement custom features. Expertise in data encryption and multi-platform development is highly desired. A keen eye for user experience and a solid understanding of varying user needs across different age groups is crucial.