Your question is Scalable Web App Architecture. 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).
Explain the architecture of a scalable web application you have built.
Focus on the major components, how requests flow through the system, and how you handled scale, reliability, and observability. Be ready to discuss tradeoffs, bottlenecks, and what you would change at higher load.