Design a Reusable Dropdown Menu Component

Company: Roblox

Role: Frontend Engineer

Category: System Design

Difficulty: medium

Interview Round: Onsite

Quick Answer: This question assesses a candidate's ability to design a reusable, production-grade UI component, covering public API design, controlled versus uncontrolled state, and accessibility semantics. It is commonly used in frontend system design interviews to evaluate architectural judgment around component libraries, keyboard interaction, and performance with large or asynchronous data sets, testing practical application rather than pure theory.