Welcome to your interview.
The question is on your right: Scaling UI for 10x Load. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
If we need to scale this interface to handle 10x the current user load, what architectural changes would you prioritize?