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Frontend · Senior · System design

Design a feed with thousands of items that updates in real time, for example an activity feed or a chat.

~10 min by voice

How to approach it

The interviewer wants to see whether you can keep the three layers of a large live feed in your head: rendering (virtualization and its pitfalls), data (cursors, normalization, deduplication, memory) and transport (choosing a protocol, reliable reconnection with no holes in the history). The point isn't to list technologies, but to show exactly where the naive solution breaks.

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Answer by voice

The interviewer will ask this question and listen. Think out loud and ask for a hint if you need one. When you're done, pause or tap “That's my answer”. In about a minute, your score and the points you covered show up here.

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Best with headphones · ~10 min