How To Hire a ReactJS Developer in 2018

How To Hire a ReactJS Developer
Before you hire your ReactJS developer, you need to know that they genuinely understand the library. Here are the top ReactJS interview questions of 2018.

Essentially, React is a JavaScript library that is used to build user interfaces. Before you hire a ReactJS developer, you need to know what makes it different from other options. Contact us for help with the hiring, naturally – but if you know what you’re looking for, that’s a big plus! This open-source library was first created by a software engineer who worked for Facebook and was deployed on this social media site back in 2011.

Before you hire a ReactJS developer, it’s important that they truly know the library to take full advantage of its purpose to be fast, scalable, and simple. One of its most useful features is that software engineers are able to change data on large web applications without reloading the page. React can also be used in combination with other JavaScript libraries or frameworks.

One advantage that ReactJS developers appreciate is its declarative views that make it more straightforward to create interactive UIs with more predictable views that are simpler to debug. React updates efficiently to your developer’s designed views for each state in the application, appropriately rendering the correct components with the data changes.

Another asset of this library lies in the fact that it is component-based. According to the site, ReactJS developers can build encapsulated components that manage their own state, then compose them to make complex UIs. Additionally, because the component logic is written in JavaScript rather than templates, it’s more simple to pass data throughout the application and keep state out of the DOM.

If you hire a ReactJS developer, they can develop new features without needing to rewrite the existing code. React can also render on the server using Node and power mobile apps using React Native.

While these are all important advantages of the library, there are a few more benefits to consider before you find a ReactJS developer to hire.

Why Hire a ReactJS Developer?

It’s simple

If you have a talented JavaScript developer, they can learn React very quickly. It features a well-defined lifecycle, utilizes JavaScript rather than domain specific language, and has a component-based approach. This makes the talent pool much larger and means that you can find an accomplished ReactJS developer to hire more easily.

It’s easy to test

Nothing makes developers happier than easy tests and simple debugging. React views are able to be treated as functions of the state. This means that it’s possible to manipulate the state passed to the ReactJS view to fully understand the output and triggered actions, events, and more.

It’s fast

ReactJS works by using a virtual DOM which performs Document Object Model much more efficiently, updating the view in a web application more simply. Because it doesn’t interact with DOM, which can be incredibly inefficient and slow, ReactJS helps add speed.

How To Hire a ReactJS Developer

Top ReactJS Interview Questions of 2018

Before you hire your ReactJS developer, you need to know that they genuinely understand the library. Here are the top ReactJS interview questions of 2018. If you want to skip the hard work of finding and interviewing a developer, however, just contact us and we’ll send you a vetted expert.

Name and explain the different lifecycle methods

To help guarantee that your potential developer has experience with React, check to make sure they know the diverse lifecycle methods:

  • componentWillMount – commonly used for App configuration in the root component
  • componentDidMount – perform setup that wouldn’t be possible without a DOM and start receiving all the necessary data
  • componentWillReceiveProps – this method changes trigger state transitions based on particular prop changes
  • shouldComponentUpdate – helps improve performance by preventing a rerender if a component receives a new prop. shouldComponentUpdate returns a boolean to determine whether or not the component is rerendered
  • componentWillUpdate – this isn’t often used, but some developers like to use it in place of componentWillReceiveProps on components that also have shouldComponentUpdate without access to previous props
  • componentDidUpdate – used to update the DOM in response to prop or state changes
  • componentWillUnmount – cancel outgoing network requests or remove all event listeners associated with the component

Explain and give an example of a Simple Component and a Stateful Component

React components implement a render() method that takes input data and returns what to display. In the example given by React, it uses an XML-like syntax called JSX. The input data passed into the component can be accessed using render() via this.props. Here’s an example of a simple component:

class HelloMessage extends React.Component {

renter() {

return (


Hello {}






<HelloMessage name=”Taylor” />,


A stateful component, in addition to taking input data, can maintain internal state data that can be accessed via this.state. When a component’s state data changes, the rendered markup will be updated by re-invoking render().

Explain the difference between state and props in ReactJS

Props, short for properties, are similar to an argument that is passed to a pure JavaScript function. They are considered immutable and should not change through a component’s lifecycle. They can be accessed via this.props. Let’s look at an example:

import React from ‘react’;

class Welcome extends React.Component {

renter() {

return <h1>Hello {}</h1>;



const element = ;

State, instead, are used to create dynamic and interactive components in React. State determines exactly how a component renders and behaves. Let’s look at a simple state example:

import React from ‘react’;

class Button extends React.Component {

constructor() {


this.state = {

count: 0,



updateCount() {

this.setState((prevState, props) => {

return { count: prevState.count +1 }



render() {

return (<button

onClick={() => this.updateCount()}


Clicked {this.state.count} times




export default Button;

Where should you make an AJAX request?

You should make an AJAX request in a React component in componentDidMount. This method is executed when the component is added to the DOM, or mounts, for the first time, so it’s only executed once throughout the component’s life. Developers can’t guarantee that the AJAX request will have resolved before the component mounts, meaning that they could be trying to setState on an unmounted component, leading to errors. Making the request in componentDidMount, though, will make sure there’s a component to update.

Hire a ReactJS Developer

Now, you know exactly why you’d want to hire a ReactJS developer as well as the best interview questions to ask him or her to guarantee they know the library. To make your life much more straightforward, contact us to do the search and interview for you so that you can have a guaranteed, vetted expert without all of the trouble.

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Angela Karl

Angela Karl

Everyone has something to say. Whether this is done through a feature article, blog post, white paper, newsletter, how-to post, or improving your SEO, I can help. As a contributor to publications such as The Huffington Post and TechGenix, I am a professional B2B and B2C IT writer with over seven years of experience with writing and editing.

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