Mobile Voice Chat App Development

I'm looking for an experienced developer to create a mobile voice chat application for both iOS and Android platforms. The app should support group chat functionality.

Key Requirements:
- Mobile compatibility (iOS and Android)
- Group chat feature

Ideal Skills and Experience:
- Proficiency in mobile app development for iOS and Android
- Experience with real-time communication (RTC) technologies
- Strong knowledge of group chat functionalities
- UI/UX design skills for a user-friendly experience
- Previous experience in developing similar voice chat applications

Please provide examples of similar projects you've completed and an estimated timeline for delivery.