Cross-Platform App Development with Messaging

I'm seeking an experienced app developer to create a cross-platform app. The app will feature a robust messaging system.

Key Requirements:
- Develop a cross-platform app for iOS and Android
- Integrate a secure and efficient messaging system
- Ensure a user-friendly interface and seamless user experience

Ideal Skills and Experience:
- Proven experience in developing cross-platform apps
- Strong expertise in implementing messaging systems
- Proficient in UI/UX design
- Familiarity with security protocols for secure messaging

Please include your relevant experience in your application.