9 Interview Questions Every Senior React Developer Should Know

Christopher Clemmons
Level Up Coding
Published in
8 min readJan 4, 2023

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As a React developer, you’ll eventually experience the urge to take that next large step into a senior role. Many of us stay stuck as a junior or mid-level developer, even as we get more experienced.

Of course, experience comes with time but some of you may have the mindset of a senior developer but not studying the required topics.

This blog will not contain tutorials but a general overview of the kind of answers you should give.

Here are some very common interview questions you may be asked while interviewing for a senior -level position as a React developer.

1. Can you describe a situation where you had to optimize a React application to improve its performance? How did you go about doing this?

As a candidate for a senior React developer position, you will be expected at times to know how to optimize a React app for better performance. Understanding React’s lifecycle and hooks can help with this. Some ways of optimizing a React app’s performance can include

  • Avoiding unnecessary rerenders
  • Using a UID (unique identifier) when rendering lists
  • Using hooks such as useMemo…

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