Coach note
System-design questions are about the trade-offs you make when no answer is obviously right. Interviewers want to see scope, the bottleneck you pick, and the rejected designs you can articulate.
System design · Scaling
Design a leaderboard system for a mobile game that shows the top 100 players globally. The game has 2 million daily active users. How do you keep the leaderboard fresh without recomputing it on every score update?
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