How to answer this Technical interview question about CSS for Any Frontend Software Engineer?

Can you explain the difference between CSS Grid and Flexbox? In which scenarios would you use one over the other?

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Frontend Software Engineer

Technical

Asked at

Google

Difficulty :

Medium

A modern, rounded square webclip or app icon with a soft gradient background, representing a mobile-friendly shortcut or digital brand identity for quick access and visual consistency.
A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

Explanation

This question assesses your understanding of advanced CSS layout techniques, a fundamental skill for frontend engineers. Recruiters are looking for your ability to articulate the technical differences and make informed decisions on when and how to use these tools. A strong answer demonstrates both theoretical knowledge and practical use cases. Avoid giving vague or overly generic responses. Instead, provide examples of real-world applications. This is crucial for roles that require crafting responsive and maintainable UI layouts.

A popular meme image featuring the Marvel character Thanos with the caption “A small price to pay for salvation,” commonly used to humorously express acceptance of a minor sacrifice for a greater benefit.

Answer Example

CSS Grid is a two-dimensional layout system that allows for precise control of rows and columns, making it ideal for creating complex grid-based designs like dashboards or galleries. Flexbox, on the other hand, is a one-dimensional layout system optimized for aligning items along a single axis, either horizontally or vertically, making it more suitable for smaller-scale interface elements like navigation bars or form elements. For example, I used CSS Grid to build a photo gallery for a portfolio website where precise control over rows and columns was necessary. Conversely, I used Flexbox for a responsive header that needed to center items horizontally and vertically across devices. Understanding the strengths and limitations of each tool ensures efficient and scalable design systems.

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