3 technical + 1 HR round.
Some interviewers are nice, some are basically unprofessional.
Things like being late, not turning camera on, and not trying to clarify his questions.
My overall impression is that they are simply looking for someone who memorizes "concurrent programming in XXX", "5 ways to protect your service from huge traffic” and “Networking 101”. Read on these topics if you really want to apply.
They show little interest in system design and algorithm skills.
And yea got ghosted after the interview.
Can’t agree more on the comments around its non-employee centric culture.