Your question is Design a Restaurant Recommendation 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).
Design a restaurant recommendation system for DoorDash's homepage.
Asked in the onsite system design stage. Clarify requirements and assumptions before proposing the architecture. Discuss retrieval, ranking, serving, evaluation, and operational risks at an appropriate production scale.