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#NotificationService

2 guides~19 min totalupdated Oct 24, 2026

Design a Notification Service: Decide Once, Store First, Nudge With an ID (2026)

Design a notification service in a system design interview: rules and dedupe, an inbox, queues and retries, TTL, priority lanes, campaigns and dead tokens.

Intermediate · 12 min

Software Architecture

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Intermediate7 minDesign a Notification Service: Failure Modes, Security and Follow-Ups (2026) Notification service design follow-ups: a failure table, multi-region failover, inbox storage, caller auth, opt-out law, monitoring, cost and a 45-minute plan.

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