Design a token manager with lazy expiration

Company: Citadel

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: medium

Interview Round: Technical Screen

Quick Answer: This question evaluates time-based data structure design and algorithmic reasoning for managing expiring items, focusing on hashing, timestamp ordering and lazy deletion semantics. It is commonly asked in Coding & Algorithms interviews to assess practical application skills in designing efficient, scalable token/TTL managers under performance constraints rather than purely conceptual theory.