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hardScaleGleanAnthropic

Build a streaming deduplicator: drop duplicate events within a sliding time window, bounded memory, late events

At-least-once delivery means duplicates are guaranteed, not hypothetical. Anyone can use a set; the round is whether your set grows forever, and what you do with an event that arrives after its window closed.

Updated Sep 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

At-least-once delivery means duplicates are guaranteed, not hypothetical. Anyone can use a set; the round is whether your set grows forever, and what you do with an event that arrives after its window closed.

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