System Design Interview Crash Course
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Design an Ad Click Aggregator

Here is the step-by-step system design for an Ad Click Aggregator.

1. Problem Definition and Scope

We are designing a backend system to track, process, and count user clicks on digital advertisements in real-time.

The goal is to ingest a massive stream of click events, aggregate them (e.g., "Clicks per minute per Ad"), and allow advertisers to view these statistics via a dashboard for performance monitoring and billing.

  • User Groups:
    • End Users: People clicking ads on websites or mobile apps.

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