Integrate Video Calling and Chat

***Please no placeholder bids***

I am looking for a skilled developer to integrate video calling and text chat messaging into my application.

Requirements:
- Platforms: Web, iOS, Android
- Video Functionality: Video calling
- Chat Functionality: Text chat
- Must be able to test functionalities and message retention

Ideal Skills and Experience:
- Experience in developing real-time communication features
- Proficiency in cross-platform development
- Strong knowledge of WebRTC or similar technologies
- Ability to deliver a seamless user experience across all platforms

Please provide examples of similar work done.