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09 March, 2023

ReactJS is a complex yet effective framework for creating interactive UIs in applications. No wonder the web framework is the second most used among developers.

A right-fit React developer can be a great asset to an organization, but hiring one is a challenge. It is understandably tricky for HR managers to frame React questions for senior developers.

The difficulty is in accurately evaluating the skills of senior ReactJS developers through interview questions. If you ask easy questions, you will miss assessing the true potential of the developer.

Alternatively, if the questions are more challenging, you might demotivate the candidate. A balance is required. Keeping a senior-level developer engaged in an interview also calls for intriguing questions that spark discussions.

Asking open-ended questions is another great way to assess the skills of senior developers. Besides, how do you avoid biases in your questions?

A tough ask, don't you think? To make it easy for you to test a developer of high caliber, here are some React questions for senior developer interviews and the expected answers.

Know the Skills Required

Before we jump into questions to ask a React developer, know the skills expected in a senior developer for the specific job description. You can frame the right questions based on the job role expectations of the developer.

Some technical skills expected in a ReactJS senior developer:

  • Expertise in HTML, CSS, and JavaScript. These are the core fundamental web development skills a React Developer must have.
  • Experience using JSX.
  • Experience using libraries and toolkits like Redux, MobX, Git, etc.
  • Experience in ES6.
  • Experience with Flux architecture.
  • Knowledge and experience working with Node and npm registry.
  • Experience in debugging, end-to-end and unit testing.

And, of course, do not miss out on the soft skills. There are some expected soft skills to display among senior developers, like good communication skills, problem-solving, working with the team, etc.

But here are some that distinguish the best-fit candidate from the rest:

  • Analytical capabilities.
  • Project management.
  • Time management.
  • Attention to detail.
  • Creativity.
  • Sticking to delivery timelines.
  • Mentoring team members.

Now, here are questions to ask a React developer in an interview.


Top 20 React Questions For Senior Developers

The following React questions for senior developers will test their expertise and experience working with ReactJS. The questions are challenging and can help identify candidates who can build a world-class React application.

  1. What experience do you have with React 16 context API?
  2. What is the PropTypes library?
  3. What is React Reconciliation?
  4. What is the purpose of React Refs? Can you share a solution to a problem using it?
  5. Can you explain how to handle asynchronous actions in a React application?
  6. What is the difference between the presentational and container components in React?
  7. How do you handle client-side routing?
  8. Can you elaborate on Router and its function?
  9. Can you state the difference between Virtual DOM and Real DOM in ReactJS?
  10. What does the “key” attribute signify in ReactJS?
  11. What is Redux, and how does it work with ReactJS?
  12. How do you optimize a ReactJS application to improve performance?
  13. What are the lifecycle methods of ReactJS components?
  14. How do you manage state in a large react application?
  15. Explain when and why you use 'useMemo( ).'
  16. Why binding event handlers to this is necessary?
  17. What is your understanding of React Fiber?
  18. When and why do you use Super (props)?
  19. What do you know about server-side rendering?
  20. Explain pure and impure functions in ReactJS.


Niche roles require niche assessments to hire skill-fit candidates. Learn how iMocha creates custom assessments for any and all job roles.


React Interview Questions For Developers with 10+ Years of Experience

Here are some questions to ask a React developer with 10+ years of experience. You can also use these questions for senior developers to assess the depth of their knowledge.

  1. What is JSX, and why is it used in ReactJS?
  2. What are 'components' in ReactJS? 
  3. What is the function of render () in ReactJS?
  4. What experience do you have with Flux architecture? 
  5. How to use Error boundaries in functional React components?
  6. Show us what a three dots (…) function does in React? 
  7. Can we update the state directly?
  8. How to implement security in React?
  9. What tools do you use for unit testing?
  10. What do you know of 'Children Prop'?
  11. Show us how you can implement authentication and authorization in a ReactJS application? 
  12. What is a ShadowDOM, and how is it different from VirtualDOM?
  13. Elaborate about StrictMode in React. 
  14. How to avoid prop drilling?
  15. What is your approach to handling complex data structures in a React application? 
  16. What do you understand by the concept of memoization in React?

React Interview Questions For Developers with 5+ Years of Experience

The following are questions to ask React developers with 5+ years of experience. These candidates are considered to be Junior developers. Avoid asking these questions to a senior developer.

  1. What is ReactJS, and how does it work?
  2. What are the limitations of ReactJS?
  3. What are props in react?
  4. What do you know about higher-order components (HOC) in ReactJS?
  5. How different are the state and props in ReactJS?
  6. What do you know about Keys in React?
  7. What do you know about Hooks in React?
  8. What is the difference between Local and Session Storage?
  9. Can browsers read JSX? If not, why?
  10. How is the arrow function used in React?
  11. Explain the difference between class components and functional components.
  12. Explain React events.
  13. What is the difference between ReactJS and React Native?
  14. What are the advantages of using ReactJS?
  15. What are the two rules to follow while using React Hooks?
  16. What do you know about synthetic events in ReactJS?


Tips For Interviewing Senior Developers

Senior developers come across as knowledgeable and skilled. With their experience, they can answer most technical questions well.

But, to understand the depth of their knowledge, you need to dig a bit deeper by engaging and generating discussions with the candidate during the interview.

One of the best ways to engage a candidate at an interview is to ask open-ended questions. For a senior developer, you can pose the following questions:

  1. If you have to use tools to build our __________ application, which tools would you use?
  2. What approach do you follow to test a react application?
  3. What is your approach to correcting the code of one of your team members?
  4. What practices do you follow to ensure continuous integration and delivery of a ReactJS web application?
  5. Can you elaborate on a problem you solved using ReactRefs?
  6. What challenges did you face in your current project, and how did you overcome them?

Apart from technical knowledge, you may want to learn about the behavioral skills of the candidate.

Here are some questions to ask a React Developer that will help identify their communication skills, problem-solving ability, time management, and ability to work with the team.

1. Tell us about a time you fixed an error in the application:

Debugging is a time-consuming process. It may take days to solve an issue. The question assesses the candidate’s problem-solving skills, where the candidate may have to break down the problem first and find a solution.
It also shows the time management ability of the candidate.

2. Are you involved with any open-source community?

The question allows you to gauge the candidate’s passion for ReactJS and enthusiasm to upskill themselves.

3. What is your approach to task delegation to your team members?

This question will assess the candidate’s communication skills and willingness to collaborate with the team.


Hiring time skyrocketing for niche roles? Learn how iMocha can cut hiring time by 50% for all roles (and help you save over 60% in hiring costs).



iMocha to the Rescue

Hiring senior developers for a ReactJS role is challenging. Numerous enthusiastic applications from junior-level candidates might flood your offices for the top post.

Assessing and identifying the right candidate is both time-consuming and energy-guzzling. But iMocha is here to the rescue. Our pre-screening ReactJS skills test can help you accurately identify top candidates for a senior developer role.

We have React questions for senior developers designed by Subject Matter Experts (SME) based on EEOC guidelines. Our assessment can weed out irrelevant candidates and improve interview-to-selection ratio.

The test platform also allows HR Managers to set test parameters for easy selection of candidates for the interviews. The exhaustive candidate analysis reports aid recruiters in avoiding biases in selection.

The question format for the test includes MCQs, MAQs, live coding, code in the blanks, Whiteboard questions, coding simulators, etc. The question variety keeps candidates engaged to continue the test.

iMocha makes it easy for HR managers to automate scheduling, executing, and assessing tests. You'll be sure to get top-quality candidates for interviews.



What questions should I ask in a React interview?
To select a senior developer, ask technical questions regarding the application the company is developing.
Ask more open-ended questions involving the candidate’s experience using various ReactJS functions and tools in a project. It will pique the interest of the candidate. Refrain from asking basic questions on ReactJS.


What specific skills should I look for in a senior developer for React?
Look for experience in Flux, Redux, JSX, ES6, Node, and any debugging tools.


How do I create an assessment test for ReactJS senior developer?
Create a challenging assessment that tests the candidate's subject knowledge and work experience. You can also take the assistance of testing tools like iMocha to create a perfect test to identify the right skilled developer.


Assess any skill, we mean it! Learn how you can create custom assessments with iMocha and check your candidate's domain, functional and cognitive skills – all using one assessment. 


Gemma Benny
Gemma Benny
I am a Content Writer at iMocha. A B2B writer that creates articles and listicles while trying to build a relationship with potential clients and also adding value to the content wherever possible. I have previously worked with clients in the medical, fashion, education, IT, and beauty domains. Before joining as a full-time writer, I worked as a digital marketer for over two years. When I am not keeping busy with content writing, you can find me baking, exploring the culinary world, and playing badminton.
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