Design Mint.com (Personal Finance Tracker)

System DesignPerplexityLast reported May 2026Low Frequency
Reported
2× across candidate reports
First seen
August 2025
Last reported
May 2026
Reported outcome
mixed

Problem Overview

Design a personal-finance platform like Mint.com: let users link bank, credit-card, loan, and investment accounts via a third-party aggregator (Plaid/Yodlee), sync and store transactions across all accounts, deduplicate them (including pending→posted transitions and corrections), auto-categorize spend, support user-defined per-category budgets with alerts, and serve…

  • 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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