Your question is Walk Me Through a Complex System. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Tell me about a complex system you were responsible for maintaining.
Keep the answer focused on the system’s architecture, the main failure modes you dealt with, and how you diagnosed and fixed issues. I’m looking for how you reason about reliability, debugging, and operational trade-offs, not a project retrospective.