A realistic, interviewer-led simulation of an system design round — not a casual walkthrough. You'll be handed a design problem and are expected to drive the session end-to-end: clarifying requirements, defining APIs, proposing high-level architecture, making database and storage decisions, and reasoning through scalability, caching, queuing, reliability, and trade-offs — while responding to follow-up pressure the way a real interviewer would apply it.
Evaluated dimensions: