Design a global real-time notification system
Company: Google
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Onsite
Overview: This question evaluates competency in designing large-scale distributed systems for global real-time notifications, covering scalability, multi-region ingestion and delivery, multi-channel fallback (push, email, SMS), delivery semantics, idempotency/deduplication, latency/throughput SLAs, and observability.
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