Welcome to your interview.
The question is on your right: Secure Low-Latency API Design. 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.
How would you structure an API to ensure both security and low latency for the end user?