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Design a versioned key-value store

Last updated: Mar 29, 2026

Quick Overview

This question evaluates proficiency in designing time-versioned key-value stores, focusing on appropriate data structures, temporal query semantics, API design, and time/space complexity analysis within the Coding & Algorithms domain.

  • Medium
  • Instacart
  • Coding & Algorithms
  • Software Engineer

Design a versioned key-value store

Company: Instacart

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: Medium

Interview Round: Onsite

Design and implement a versioned key-value store that supports set(key, value, timestamp) and get(key, timestamp) to retrieve the most recent value at or before timestamp. Discuss data structures, time/space complexity, and how to handle out-of-order timestamps, large timestamp ranges, and memory limits. Extend the API to support delete, range queries by time, and background compaction.

Quick Answer: This question evaluates proficiency in designing time-versioned key-value stores, focusing on appropriate data structures, temporal query semantics, API design, and time/space complexity analysis within the Coding & Algorithms domain.

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Instacart
Aug 1, 2025, 12:00 AM
Software Engineer
Onsite
Coding & Algorithms
4
0

Design and implement a versioned key-value store that supports set(key, value, timestamp) and get(key, timestamp) to retrieve the most recent value at or before timestamp. Discuss data structures, time/space complexity, and how to handle out-of-order timestamps, large timestamp ranges, and memory limits. Extend the API to support delete, range queries by time, and background compaction.

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