Design TikTok Video Recommendation System
Design a video recommendation system for TikTok that can analyze user behavior and preferences to suggest personalized short-form videos in real-time.
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Late February, 2026
Meta
Mid-level
No constraints were mentioned. Very open-ended. But the goal was to maximize the number of comments.
Late February, 2026
Meta
Senior
Instagram reels recommendation. First discussed model architectures (CLIP). Then discussed training using multi-task learning. Asked about nDCG and other ranking metrics. Also discussed A/B test, statistical tests etc.
Late October, 2025
Meta
Mid-level
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