millions of users, happy/unhappy flows, traffic smoothing. HLD only. covered: queue + virtual waiting room. users get a slot, told ETA. CDN for static. SQL replicas for read-heavy product browsing. inventory reserved when added to cart (TTL on reservation). failure: degraded mode - hide low-stock items, disable wishlist.

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JPMC SDE-2 HLD - black friday jun

millions of users, happy/unhappy flows, traffic smoothing.