Online Fraud Detection + Offline Analytics System Design

System DesignRobloxLast reported May 2025Low Frequency
Reported
1× across candidate reports
First seen
May 2025
Last reported
May 2025
Reported outcome
unknown

Problem Overview

Design a system that supports two workloads simultaneously: (1) real-time (online) fraud detection — scoring/classifying transactions or user actions with low latency as they happen; and (2) offline analytics — batch processing and analysis of historical data for reporting, model training, and business…

  • 4 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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