Banking System (OA)

OAAnthropicLast reported July 2026High Frequency
Reported
17× across candidate reports
First seen
September 2024
Last reported
July 2026
Reported outcome
mixed

Problem Overview

Anthropic online assessment question, reconstructed from 17 candidate reports (September 2024 to July 2026). Tests: stateful class design; balances, ledgers and billing; time-based state (expiry, TTL, snapshots). Candidates reported 4 follow-ups. The write-up includes a Python solution that passes 7 test cases.

  • 4 candidate-reported follow-ups — the probes candidates report being asked, with the trigger for each
  • The full 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. Follow-ups candidates reported, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The follow-ups candidates reported, with the trigger that prompts each one — plus the mistakes that sink people.
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