System design interview question
"Design a calendar system. Users create events, invite others, see free/busy across attendees, and set up recurring meetings. The scheduler should suggest times that work for everyone. A billion users, and calendars are shared across organizations."
recurrence and free/busy computation, which are deceptively intricate. Two specific hard parts: recurring events cannot be materialized indefinitely yet must support per-occurrence exceptions, and finding a common free slot across many attendees in different timezones is an intersection problem that must be fast.
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