System design interview question
"Design Zoom. Meetings with up to 1,000 participants, screen sharing, recording, and it has to work for people on a laptop in an office and a phone on 3G in the same call. 300 million daily meeting participants."
The group-scale extension of real-time media. Beyond Duo's NAT problems, the distinguishing content is: SFU architecture and why mesh/MCU lose, simulcast/SVC to serve heterogeneous receivers from one sender, active-speaker selection, and cascading SFUs for geographically spread meetings.
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