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Interview questions
Real-time systemsHardSDE-3

During a cricket final with 25 million live viewers, you want to show live comments and emoji reactions on the stream. Design how reactions and comments reach everyone.

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Think first

Answer out loud as you would in the room — clarify, give numbers, name the trade-off — then compare with the model answer.

Go deeper

Design live comments and reactions for live streams Lesson: Hot keys, hot partitions and fan-out

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