10Design a recommendation engine for an online-course (or e-commerce) catalog.▼hardAmazonCourseraUdemyunlockedNew courses launch every week and most browsers are signed-out or brand new, so the interesting half of this problem is what you recommend when you have almost no behavioral signal. The other half is avoiding the trap of optimizing engagement into a clickbait catalog.Open full answer →
11Design the 'For You' ranking system for a short-video feed.▼hardTikTokMetaYouTube○ sign inThis product succeeds or fails on a feedback loop measured in seconds: every swipe is a label, and the following video must respond to it. The tricky part is exploring widely enough to learn what someone enjoys while avoiding a filter bubble or the amplification of junk.Open full answer →