Payment App to Twitter Notification System Design

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

Problem Overview

Design a system where, when a user receives money in a payment app (e.g., Venmo/Zelle-like), the system automatically posts a tweet on that user's behalf on Twitter. Inputs are activity events from the payment app; output is a posted tweet. The system must be designed end-to-end, including how it integrates…

  • 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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