Design a User Event Tracking System: Real-Time Dashboard, Enrichment, Warehouse

Also reported as Ad Click Aggregator Variant · Metrics Monitoring System

System DesignRipplingLast reported June 2026High Frequency
Reported
13× across candidate reports
First seen
November 2025
Last reported
June 2026
Reported outcome
mixed

Problem Overview

One candidate posted the prompt in English: We are a growing startup and want to track user behavior across our product. We are scrappy, and don't want to use services like Amplitude or Mixpanel. We have mobile and web applications which will generate events which we will need to ingest…

  • 8 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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