Your question is System Design Whiteboarding. 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 time you led a high-level system design whiteboarding session; walk me through your approach, trade-offs, and how you validated your design.
Discuss the problem context, requirements, scale assumptions, architecture, and your role in guiding the session. Explain the key alternatives you considered, how you handled uncertainty and failure modes, and how validation through analysis, prototyping, testing, or operational feedback influenced the final design.