Cross-Platform Chat App Development

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

Key requirements:
- User authentication via email and password
- Core functionality for text messaging including:
- Message payload
- Message sent
- Message received
- Message read

Ideal skills and experience:
- Proficient in mobile app development for both iOS and Android
- Strong background in implementing secure email/password authentication
- Experience with real-time messaging features and backend integrations
- Familiarity with UI/UX design principles for chat applications

Please provide examples of similar work done. Looking forward to your proposals!