Delayed / Scheduled Payment System Design

System DesignRobloxLast reported April 2026High Frequency
Reported
10× across candidate reports
First seen
March 2025
Last reported
April 2026
Reported outcome
mixed

Problem Overview

Design a payment system that supports delayed/scheduled payments, primarily in the context of an in-game economy (e.g., Roblox). Core operations include: schedule_payment(from_account, to_account, amount, execute_at), cancel_payment(payment_id), and get_payment_status(payment_id). The system must: (1) reliably execute payments at or after their scheduled time; (2) handle peak traffic (thousands of QPS) without data…

  • 5 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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