Top 6 Skills to Look for in a React JS developer (before Hiring One)

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By: Sagar Sharma

Top 6 Skills to Look for in a React JS developer (before Hiring One)

React has been in the list of most popular JavaScript frameworks ever since its inception. Today, it is the most trending and used JavaScript library by many corporations.

The most significant value addition of this library is that it is also compatible to build mobile applications for both Android as well as iOS.

If you want to build a web app or a mobile app, the first thing you’ll have to do is hire React JS developer. But, how would you hire the appropriate developer for your project?

This article will help you to identify the six most essential skills that every React JS developer you hire must pursue.

Top 6 Must-have Skills for a React JS Developer


HTML and CSS are must-haves for a front-end developer. The ability to not only build but “craft” user interface is essential to look for in a React JS developer.

In addition to that, a React JS developer must be able to:

  • Write semantic HTML tags
  • Write CSS selectors
  • Implement reset in CSS
  • Reset the border-box and know the box model
  • Understand flexbox
  • Implement responsive web principles including the appropriate use of media queries

#2 JSX

A developer must know the most remarkable element of the React ecosystem that is JSX. It is a syntax extension of the React ecosystem, which looks pretty similar to HTML.

We can consider it as an HTML-flavored JavaScript. Hence, if a developer knows HTML/CSS, he/she will probably know JSX as well.

JSX is a notion on top of the React.createElement() API. One of the reasons for this library to be crucial for React JS development is because the APIs are too complicated to scale.

Using this API, a developer can build an entire application. However, using the element to build the application and using HTML to build the app is the same thing.

#3 Git

Git is one of the most critical elements in any developers’ toolkit. It is used to store projects on platforms like GitHub, GitLab, and Bitbucket. A developer must know how to use these platforms, which includes:

  • Keeping track of changes with a comment, add, pull, and push.
  • Merging and branching strategies.
  • Managing merge conflicts.

#4 Node + NPM

Yes, you heard it right. The React JS developer you hire must also know Node JS in order to be a client-side React JS developer. Several other packages allow you to extend the React library.

Moreover, a React JS developer must also have a deep understanding of the npm registry. It is a place where developers can get softwares that helps them to build softwares.

Sounds funny? Well, that is the truth of npm; it is cloud storage that holds the packages we call dependencies.

Yarn v/s npm

Yarn is also a package manager that is used to leverage the npm registry. Yarn can optimize npm workflows. The aim behind introducing Yarn is to resolve problems that are accepted in the Node/npm ecosystem.

#5 JavaScript Fundamentals + ES6

Learning React without the knowledge of JavaScript is like learning calculus without the knowledge of multiplication. Along with JavaScript, you also need to learn and get skilled with ES6.

Variables and Scoping

It includes the understanding of when and where one has access to the data, which is necessary. Variables are the mechanism developed into JS that allows us to hold important data in memory and later access it whenever required.

ES6 is the new element that helps us to store variables within our applications rather than the traditional ‘var’ keyword. one can choose to live with the principle that unless it is crucial to use ‘var’ one should use ‘const’ until the linter tells us to do otherwise, then default to ‘let.’

Arrays and Objects

React suggests us a pattern that our view is the function of our state. The state is the information that we want to show to users or items in the memory that one can access to allow users to interact with the data. One should know how to mutate the objects and change the values of properties on them.

#6 Redux

Redux is the final thing that a React JS developer must know. Redux is a state management library that helps developers to manage and maintain the states in React.

The principles behind Redux are similar to functional programming and immutability. However, one should not confuse this with all in one solution. You should give extra points to the developer who is skilled with Redux.


While hiring a React JS developer, you must frame the interview questions in such a way that tests these six skills. It is recommended to hire a developer who has all the above skills if not at least five of them.

At Credencys, we have a team of highly trained and skilled React JS developers who can translate your complex requirements into a working prototype.


1) What does a React JS developer do?

A React JS developer creates the interactive part of a web application by creating components that can receive and send data from the backend server.

2) Why should I use React JS?

React has the unmatched capability to create and use Re-usable components, which helps you create an application faster and more efficiently.

3) What is the future of React JS?

React was released in 2013 by Facebook. Today, it is one of the fastest-growing JS libraries in the world. Many popular companies, including Netflix, Facebook, Instagram, Airbnb, and more are using React. So yes, it does have a future, and it’s quite bright.

4) Which is better, React JS or Angular?

Both frameworks have their benefits. Angular is a full-fledge framework, whereas React is a JavaScript Library. Angular is helpful when you want to build an application from scratch, whereas React is used when you want to scale existing applications.


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