Required software development freelancer for Video Conference System job

Looking for a Video Conferencing System with following specifications:

Closed rooms possible
Handling sensitive company data in the room
On Premise and Saas
Own company system option
External participants take part in a conference via link without software download or registration
Licensing models
Many users can attend a conference in parallel across different rooms
Many users (min. 500) can log in to a room in parallel and use the video function
Chat function possible
User friendly?
Classroom opportunity for universities to provide lectures and plan live lectures

Data Privacy; No profiling; Encryption of Conference; Protocols and conversation should be deleted after a conference; Screen transmission or recording should require explicit consent.

Skills & Expertise Required

software development