In-Memory Database

OAAnthropicLast reported July 2026High Frequency
Reported
12× across candidate reports
First seen
May 2025
Last reported
July 2026
Reported outcome
mixed

Problem Overview

Anthropic online assessment question, reconstructed from 12 candidate reports (May 2025 to July 2026). Tests: in-memory database or key-value store; time-based state (expiry, TTL, snapshots); stateful class design. The write-up includes a Python solution that passes 8 test cases.

  • 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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