Your question is Design a Short-Video Retention Recommender. 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).
You are designing the recommendation system for a short-video feed. The product needs to optimize what users watch next, balancing immediate engagement with longer-term satisfaction so the feed stays compelling over time.
Design a large-scale recommendation system for YouTube Shorts that optimizes for both short-term user engagement and long-term user retention.