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MERN Stack Developer Interview Question

MERN Stack Developer Interview Guide

Top Interview Questions for MERN Stack Developer

MERN is a collection of JavaScript-based technologies: MongoDB, Express, React, and Node.js, and a MERN stack developer is someone who works with all of them and develops web applications. 

According to the StackOverflow Developer Survey Results 2021, React is the most popular web framework. 

Are you in a hurry to get started? Download the MERN Stack Developer Interview Questions and Responses Toolkit.


MERN Stack Developer Hard Skills

Hard Skills

Use these questions to identify a candidate’s technical knowledge and abilities

MERN Stack Developer Soft Skills

Soft Skills

Use these questions to assess a candidate’s personality traits and cognitive skills

What to look for while interviewing for a MERN Stack Developer?

The skills required for a MERN stack developer position are command over job, frontend technology(React.js), backend development, and database management. Therefore, look for a candidate who has knowledge of all these. 

Here are some skills to look out for when hiring a MERN Stack Developer

Top Skills for MERN Stack Developer

Role-specific skills to look for: Knowledge of frontend and backend programming languages like  HTML, JavaScript, Node.js, SQL, and NoSQL. 

Soft skills to look for Problem Solving, Inquisitive, and creativity.

Pro Tip: Always screen before your interview. Use Online Assessment to screen applicants for a MERN Stack Developer position before blocking your time for an in-person interview.

Questions to ask while interviewing a MERN stack developer    

We have compiled a set of questions with the help of 70+ hiring managers at different organizations.

Top Role-based interview questions for MERN Stack Engineer

Top Role-based interview questions for MERN Stack Engineer

How Node prevents blocking code?

Purpose of this interview question:

Knowledge of blocking and unblocking in Node is important for the job role of a MERN stack developer, hence an applicant for this job role must be able to know about the same.

What to listen for:
  • The Ideal answers would explain what and when to use them.

What’s the Event Loop?

Purpose of this interview question:

Since asynchronous programming is a major development in programming, hence knowledge of this becomes important for this function.

What to listen for:
  • Listen for the terms specific terms that explain the event loop. 

What is Stream and what are the types of Streams available in Node.js?

Purpose of this interview question:

This question tests the candidate’s knowledge of data handling, since it is an important functionality of Node.js it is important for this job role.

What to listen for:
  • Listen for specific terms that explain streams and it’s type. 

How to screen MERN Stack Engineer for soft skills

How to screen MERN Stack Engineer for soft skills

How do you solve a conflict at work?

Purpose of this interview question:

This question helps in making sure that the candidate can be understanding, logical during a conflict in the workforce.

What to listen for:
  • An ideal candidate would share their experience.

If you know there are multiple improvements that need to be made, but can only make one, how would you prioritize?

Purpose of this interview question:

Here you will get to know about the management skills and on what basis the candidate prioritizes their work.

What to listen for:
  • The top candidate would make the choices based on the situational requirements. 

How do you like to work, with a team or on your own?

Purpose of this interview question:

This question is designed to understand if the candidate is a team player or loner. 

What to listen for:
  • An ideal candidate should be able to work in both situations. 

Start Optimizing your MERN Stack Developer Hiring today

Start Optimizing your MERN Stack Developer Hiring today

Find and hire talent with confidence. If your candidate doesn’t know the answer to the above questions and you’re hiring for a MERN stack developer position, then they’re probably not a great fit.