KV Store QPS / Hit Counter (Map Operations)

CodingDatabricksLast reported August 2026High Frequency
Reported
35× across candidate reports
First seen
February 2025
Last reported
August 2026
Reported outcome
mixed

Problem Overview

Design and implement an in-memory key-value store class supporting put(key, value) and get(key) operations. Additionally, implement methods to track and return the average number of put and get calls per second (QPS) over a rolling time window (commonly the past 5 minutes / 300 seconds). The system should use real…

  • 10 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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