Cross-Platform Messenger App Development

I'm looking for a skilled developer to create a customizable messenger app that supports iOS, Android, and web platforms. The app should include text messaging and voice calling features, along with user authentication via email and password.

Key Requirements:
- Development for iOS, Android, and web platforms
- Features: Text messaging, Voice calling
- User authentication with email and password

Ideal Skills and Experience:
- Proven experience in developing cross-platform applications
- Strong knowledge of real-time messaging and voice call integration
- Expertise in secure user authentication protocols
- Familiarity with UI/UX design for a seamless user experience

Please provide examples of similar projects you've completed. Looking forward to your bids!