Your question is Optimal Spotify-like Recommendation System for Google. 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 recommendation system like Spotify in an optimal way, balancing low latency with efficient computational resource usage.
Asked in the ML core system design stage. Expect an optimal solution addressing performance, scalability, and recommendation quality.