Hire React.js developers with ultraGenius

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Hire only the top 1% among the 20K+ engineers who have applied to UltraGenius

Rishabh

ReactJS developer

Rishabh is a software engineer having 7+ years of experience in designing front-end web applications and is expertised in web development.​

Expert in

Node.js

React.js

CSS

HTML

Experience

10 Years

Availability

Full Time

Mahesh

React.js developer

Mahesh is a software engineer having 3+ years of experience in developing dynamic single page web applications and mobile apps using ReactJS and NodeJS.

Expert in

React.js

Node.js

CSS

HTML

Experience

10 Years

Availability

Full Time

John

Part-time React developer

John is a software engineer having 10+ years of experience working with ReactJS. He is experienced working on Single Page Applications and designing web applications with React.

Expert in

Express

React.js

CSS

HTML

Experience

10 Years

Availability

Full Time

freelance ReactJS developers

Hire dedicated ReactJS developers with UltraGenius

ReactJS is a fast, efficient, and flexible Javascript library which is used for designing interactive user-interfaces for web applications. The core features of React include reusable web UI components, Virtual DOM, and JSX.

What UltraGenius offers?

Fast Hiring

ultraGenius ensures that top quality developers with the most talent are hired in less than 72 hours.

Intelligent Matching

The matches are specifically curated as per your needs. We dim fit 3 skills - Tech, Culture, and Context Fit.

Rigorous Vetting

ultraGenius conducts tests and ensures that only the most suitable developer with the best skills is hired.

Hire React.js developers through UltraGenius in 4 easy steps

01
Tell us the skills you need

We’ll schedule a call and understand your requirements.

02
We find the best talent for you

Get the list of pre-vetted candidates in days.

03
Schedule the interviews

We will arrange a call after understanding your requirements.

04
Begin your trial

Start working with UltraGenius with a 1-week trial period.

Our Happy Clients

UltraGenius is the best remote talent network to meet with brilliant developers who are most talented and skilled in the technical field. UltraGenius provides the most fit developers who not only match our job requirements but also our company's culture and working environment.
Microsoft
Once you are part of UltraGenius, you don't have to look for another platform which can find the top skilled developers with same effort as UltraGenius. UltraGenius's vetting tests and assessments are unmatchable and provides the perfect match for the job role.
VMware
Our company is thankful to UltraGenius wholeheartedly. UltraGenius's pace of finding the top 1% developers is unmatchable. Not only UltraGenius developers are the ones who match our job requirements but also the best fit to our company's working culture .
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Join 200+ Fast-scaling Start ups
and Fortune 500 Companies that have hired React.js developers

Want to hire ReactJS developers on your own? Here are the skills you must look for while hiring a ReactJS developer

If you are looking for a high-demand but difficult skill to develop interactive front-end, ReactJS is one of the most demanded skills. However, hiring the best and brightest ReactJS developers can be challenging even if you have all the necessary skills. That’s why UltraGenius provides its expertise in helping manage your recruitment process while getting only top talent with in-depth knowledge of software development.

The following skills you must look for while hiring a React developer:

Familiarity with the core HTML, CSS, and Javascript

React.js is a smooth-running and interactive front-end framework that is specialized in working with Asynchronous Javascript and XML (AJAX). If the developer has worked with Leaner CSS and Syntactically Awesome Stylesheet (SASS) then they are skilled in using React.js, which makes it an excellent choice for web development. The developers also have experience working with Grunt, Gulp, Bower, as well as JavaScript build tools like Grunt.js and Gulp.js.

 
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Javascript fundamentals + ES6

The React.js developer must be clear about the fundamental concepts of Javascript language along with these ES6 skills –

  • Variables and scoping
  • Arrays and object
  • Array methods
  • Functions and arrow functions
  • DOM Manipulation and event handler
  • The “this” keyword
  • The “class” keyword
  • Prototype chain and object creation
  • Higher order functions and callback functions
  •  

Conversant with JS build tools

While working with React, webpack and npm are essential tools. You will also need to know how to use yarn and have a basic understanding of webpack .

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Experience with testing frameworks and tools

Rising quick-deployment needs during the development phase, testing has become an important skill for React developers. Therefore, the developers should know about Jest, Enzyme, Mocha, Chai, AVA(), and Tape for unit testing. For end-to-end testing, they must know about Selenium (webdriver), Webdriver (chromeDriver), Cypress (cypressDriver), Nightwatch (nightwatch Driver), Puppeteer (), and Karma ().

Familiarity with Version Control System (VCS)

Developers must have a very good knowledge of version control systems, like Git and SVN. Mostly, developers use Git for their work. This system helps the team collaborate and organize your code by helping them keep track of frequent changes that happen in it as well as managing the commit history. Additionally, using branches, commits, and merging allows developers to work independently on the code without any problems..

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Knowledge of MVC architecture

React developers must know about Model-View-Controller (MVC) architecture. MVC approach helps you to create applications that separate the input logic, business logic, and UI logic while maintaining the loose coupling between the elements.

Experience developing RESTful API(s)

A developer must know what REST – API(s) that are used in HTTP requests using GET, PUT, POST, and DELETE methods, which enable developers to read the web application more clearly and use it effectively.

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part time developer

Experience with web markup and UI, UX Concepts

The developer must have a firm understanding of element positioning, displaying the elements, and making components interactive. In addition, they must be experienced with other UX concepts related to presentational markup like how headings are displayed, text is larger and put emphasis on it, captions can be included in items within table cells, etc.

Experience working with ReactJS workflows

Very important point : State management in React.js is the biggest challenge developers face while dealing with the large applications. Look for the developers who have worked with projects where they have managed states across multiple components and optimized application performance.
Check if they have worked with the popular libraries like Redux, Mobx, and Context APIs.

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freelance software developer

Proficient in writing optimized and readable code

You must hire the developers based on their ability to write clean and optimized code that is understandable by all the team members, and is scalable.

Pay only after one week trial period

Connect with the top 1% React.js developers of the world at the lowest prices

React.js is a widely used JavaScript framework for developing native apps. This means that it has low load time, making it perfect for mobile devices! A React.js developer does the job of designing and maintaining the user interface components- something that takes a lot of skill and experience to do well when there are so many talented developers competing for the same job opportunities!

Top Interview Questions to ask while hiring a React.js developer

React DOM is slow as compared to Virtual DOM. React DOM can directly update HTML while Virtual DOM doesn't directly update HTML. Real DOM creates a new DOM if the element updates while Virtual DOM updates the JSX if the element updates. Real DOM manipulation is very expensive while Virtual DOM manipulation is very easy.

JSX stands for JSX stands for Javascript XML. This is a type of syntax extension which allows us to directly write HTML in React by converting HTML into React components, which helps you to easily create user interfaces for your web applications.

The virtual DOM is a programming concept where a virtual representation of UI is kept in memory and synced with the real DOM with the help of a library like ReactDOM. This process is called "Reconciliation".

Whenever any data is changed in UI, the changes are rendered in Virtual DOM first, then Virtual DOM is compared with Real DOM, the Real DOM will be updated only with the things that have been changed.

React lets you use state and other React features without writing a class. It makes logic and UI separable easily. To change a functional component into a class component requires a little bit of refactoring, but with React hooks functional components have the capability of tapping into the state, so that the refactoring effort will be minimal.

The lifecycle of the component consists of four phases -

  • Initialization - The constructor() method is called before anything else when the component is initiated and sets up the initial state and other initial values. This method is called when your component is created but is not added to the DOM. Its main use is to initialize the state and bind this for component methods.
  • Mounting - The component is added to the React DOM. Mounting includes the following methods like constructor(), getDerivedStateFromProps(), render(), and componentDidMount().
  • Updating - The component receives changed props or states and is called when the components is re-rendered. Updating the component includes shouldComponentUpdate (), componentWillUpdate (), componentDidUpdate () methods.
  • Unmounting - The component is removed from the React DOM. It includes the method componentWillUnmount().

Far far away, behind the word

  • React increases the efficiency of an app by using Virtual DOM

    React uses Virtual DOM which is the virtual representation of the Real DOM, each time when the data changes in a React application, a new Virtual DOM is created instead of reloading the page every time.

  • Embedded JSX Feature

    React has an embedded feature of writing HTML inside Javascript, and place the HTML code in the DOM without using functions like createElement() or appendChild().

  • SEO-friendly User Interface

    React enables developers to develop engaging user interfaces that can be easily directed in search engines. React also allows server-side rendering, which improves the SEO of an application.

  • Components are reusable

    For developing applications, React uses component-based architecture. Components are independent and can be shared across various applications having similar functionality. The re-use of functionality enables developers to quickly design pages.

  • Offers a very rich Javascript library and supports handy tools

    React offers a vast Javascript library that provides developers more flexibility while designing web pages. React also allows developers to code and debug applications with the help of their native tools. React developer tools have been designed as extensions in Chrome and Firefox that easily allow you to inspect the React component hierarchies in the Virtual DOM. If the developers want to examine any component, they can select and edit their current props and state.

 

Props stand for Properties in React. Props are the read-only components generally used to render dynamically generated data. Props are passed in the functions as similar as the arguments are passed. Props are always sent from parent to child component and never vice-versa.

  • Props are immutable while the States are mutable.
  • Props allow you to pass information from one component to another in the argument form, while a State doesn't pass but holds the information about the components.
  • Props make a component reusable by passing it to the child component while States do not have any functionality like this.
  • Props are external and are controlled by whatever renders the component while the State is internal and is controlled by the React Component itself.
  • Props are used to communicate between the components, States can be used for rendering dynamic changes with the component.

Each component must have a render() method. The render method returns a single React element which is the representation of the native DOM component.

To render more than one element, they must be grouped and enclosed inside the elements.

Frequently Asked Questions

UltraGenius is one of the leading platforms for hiring remote talent and connecting developer and part-time developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out only the top 1% most skilled freelance developers among the 20K+ developers who have applied on our platform. Candidates have to prove their self-reported experience by giving UltraGenius’ s skill tests.

UltraGenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which is a video round that deeply analyzes developers’ major skills and asks questions about the projects they have worked upon.

Fill up the form which is on every hiring freelancers’ page and we will inform you once we select the top 1% React.js developers matching your job requirements.  After analyzing the candidates based on their resumes and two assessment tests, we provide you the feedback quickly. And if the developer selected by our team are fit for your job role, then we also provide the onboarding.

UltraGenius offers you only the most skilled developers who are top 1% among the 20K+ developers who have applied on our platform. After a rigorous selection and testing process, we sort out only the top candidates for you. You can check out UltraGenius’ s selection process for hiring React developers on http://www.ultragenius.club/hire-react-freelancer.

UltraGenius provides you the best facility to hire developer in more than 50 skills like React, Angular, Javascript, Node, Java, Python, Magento, Ruby On Rails, Golang, PHP, WordPress, .NET, Android, iOS, DevOps, Machine Learning, and many more.