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Node.js service design ensures live poll notifications reach offline users

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A Node.js service architecture is described for reliably delivering live poll results to all participants, including those who disconnect during a session. The design queues notification events in a durable per-recipient inbox before publishing them to currently connected users. This ensures users who reconnect after a session can still retrieve their notifications, addressing a scenario where 4,000 B2B SaaS participants might answer a poll within 12 minutes. The system's core invariants include stable event IDs, deduplication, and idempotent retries to guarantee delivery without user-visible duplication.

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