Your question is General 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 general recommendation system (ML System Design).
Asked in the Onsite Round 2 stage. ML system design focusing on recommendation systems. Clarify the product goals, then design the online and offline paths, including retrieval, ranking, re-ranking, evaluation, and monitoring.