Native Communication App Development

I'm seeking experienced native developers for both Android and iOS platforms.

Requirements:
- Develop a communication app (e.g., messaging, calling).
- Ensure high performance and security.
- Design intuitive, user-friendly interfaces.

Ideal Skills and Experience:
- Proven track record in native mobile app development.
- Expertise in both Android and iOS environments.
- Strong understanding of communication protocols and security measures.
- Experience with UI/UX design principles.

Please provide examples of previous similar work.