System design interview question
"Design a fantasy sports platform. Users pick a squad of real players before a match, join contests with entry fees, and their team scores points as the real match unfolds. Ten million users enter contests for one cricket match, and the leaderboard updates live during play. Prizes are real money."
fan-out of a live event to enormous scoring workloads, combined with money. One ball bowled changes the score of millions of fantasy teams simultaneously, and those scores feed a live leaderboard that determines cash prizes. The distinguishing content is: how to avoid recomputing millions of teams per event, the entry spike before lock-in, and financial correctness at settlement.
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