Design real-time ad impression and spend tracking
Company: Snapchat
Role: Software Engineer
Category: System Design
Difficulty: medium
Interview Round: Onsite
Overview: This question evaluates system design and distributed systems skills, focusing on real-time event ingestion, accurate counter aggregation, low-latency read paths, scalability, and consistency in an ad impression and spend-tracking context, and it belongs to the System Design/backend domain.
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