I did a system design interview today. And whilst they didn't ask this question, I offered to show them anyway. This is a system design 'interviewer' app. It uses Excalidraw but with a bunch of features on top. The agent provides a technical brief, and then you can use the agent in voice mode and it will draw the diagrams for you based on what you say. It can't help fill in gaps or suggest things, because thats cheating! It's purely a 1:1 draw what I say. After you finish, it will interview you, score your result and provide feedback where there are any gaps in your design.