Group-based Communication Platform Development

I am essentially looking to build a focused, group-based communication platform that’s intuitive yet flexible as a proof of concept.

Flutter Mobile App (iOS & Android)
●A Flutter-based mobile app that enables users to engage in text, voice, and video. The mobile can initiate calls from the app or receive a call from external browser.
communication within groups.
- Prioritised Group messaging (text, voice, video)
- On-demand cross-group calling with keyword-based access

Single Page Web App (JavaScript)
● A JavaScript single-page web application that allows web-based calls.
- Enables users to initiate calls via browser
- Lightweight and intuitive — ideal for demos or quick access

Admin Panel
● An Admin Panel that gives backend control over user permissions and feature toggles.
- Control user access, group assignments, call permissions
Toggle features (text/audio/video) per group or user
Real-time status overview and basic logs

I need complete Source code and a proper documentation at the end of the Project deliverable.