React.js Developers for Hire in 48 Hours

React.js is a JavaScript library designed for easy development of interfaces — the website’s front-end. This is the external part of websites and applications with which the user interacts. It is the second most popular web framework among developers worldwide. In 2022, it completes its fifth year as the most wanted technology in the engineers’ circles — they seem to really love working with it, and companies often want to find React.js developers for hire. 

Almost half (42.62%) of professional software developers use it in everyday tasks.

React.js was invented by one of the developers of Facebook, namely Jordan Walke. He introduced it to Facebook’s team in 2011 — to build the website’s news feed. Later, they adopted this technology for the Instagram feed, too.

In the very beginning, it was developed as a closed technology, only for Facebook developers. However, at one of the conferences in 2013, its code became completely open, and React became available to every programmer.

Now any developer will say that at the moment the React framework is flourishing like never before. Every day it gets new fans, and new materials, documents, and tutorials get created for it. Reactjs projects most commonly cover quick and lightweight software development and the creation of dynamic user interfaces for single-page apps. It is backed by companies like Instagram, Netflix, Uber Eats, and Khan Academy that use it within their web apps. 

Intrigued? Then let’s see why one should hire React js developers!

Why Pick React.js Web Developers: Three Benefits of the Technology

Undoubtedly, developers love this technology. That’s why more and more novice React programmers are learning how to use it. And while advantages for the coder are obvious, how can startups benefit from searching for React developers for hire?

Skilled Reactjs developers can significantly reduce programming time by reusing code components.

When working with ReactJS, coders create reusable components: most often, UI components can be used repeatedly in other parts/on different levels across the project. A recent React.js feature, React Hooks, alloweds you to reuse not only interface components but the stateful logic & behavior. That functionality makes app development easier & quick to maintain and scale. 

Moreover, hundreds of libraries with ready-made open-source components are available to full-stack React developers. Thanks to them, development time is reduced as well, which is very important for startups who want to cut time-to-market.

React’s Virtual DOM boosts web apps and allows developers to build dynamic UIs easily.

The Document Object Model, or DOM, is a way to represent and interact with objects in HTML, XHTML, and XML documents. Each such document is a hierarchical tree of elements, called a DOM tree, which is basically a number of scripts that allow users to do things on the website. 

Real DOMs “refresh” the entire tree if something changes in a part of it, e.g. if the user interacts with a part of it. That takes a lot of time, and the website’s performance often lags due to DOM processing. React js developers use the library’s Virtual DOM instead. Virtual DOM is a reflection of real DOM that tracks the changes in the UI, compares them to the real one, and updates only the elements of the tree that changed — cutting the processing time a lot. This is especially beneficial for the development of SPAs and PWAs (websites like Facebook and Twitter): their UI has to be updated quickly & without reloading the page. 

React.js has one-way data binding — the code is stable and debugging is easy.

One-way data binding in React is another very useful feature. This flow of data is also called top-down or parent-to-child. Everything is quite simple: in React applications, data is passed between elements in only one way. Such data flow prevents errors and facilitates debugging.

This feature comes in handy for products and services that must be regularly updated and scaled.

What Projects Is React.js Especially Fitting For?

ReactJS is perfect for the rapid development of lightweight apps and prototypes as it allows for the quick building of UIs. 

Also, it is used for building dynamic single-page apps. Tech companies hiring React js developers can create social networks (like Twitter), media resources (like New York Times), and e-commerce projects (like Shopify and Amazon). React.js features allow Amazon, for instance, to develop and provide reliable and multifunctional sales management systems for online stores. These systems are suitable for huge traffic. 

Moreover, React greatly complements Node.js. Employing a React front end developer is a common solution for projects that use Node.js as a server-side technology. Deciding to hire React developers for the client-side part, startups would be able to work across the same JavaScript ecosystem. This would allow broader code reuse, easier communication between front- and back-end, and fast app performance enabled by React.js Virtual DOM. All these simplify application development and maintenance and ensure a consistent look and feel across the entire project. Development time and overall costs of the project will also be reduced.

What’s Better: React.js, Angular 2+, or Vue.js? 

It depends on the project scope and existing tech stack. Check the info below to see which software engineer you should hire:

You Want to Hire ReactJS programmers. What Should They Know?

Note: the info below is for a general understanding of React devs’ skillset. You can find the skills breakdown for every seniority level right after this section.

React.js developer’s tech stack

Here is what React js developers for hire should have in their tech stack:

• React.js knowledge. 
• JSX. It’s a language React.js devs sometimes use to define React components. 
• Redux. React.js does not have a built-in state manager. The Redux library has been used as a standard for the library for a long time. It helps manage dynamic elements and improves rendering. 
• Babel. A browser doesn’t know anything about JSX and can’t interpret it. Thus freelance React developers should run the code through Babel. It is a special transpiler program that translates different representations (that is, languages like JSX) into JavaScript code.
• Webpack. It is a module bundler that lets you compile JavaScript modules into a single JS file.
• NPM. NPM (stands for Node Package Manager) is a package manager for the JavaScript programming language. NPM is used by programmers to install ready-made solutions to use in their projects.

All these tools greatly simplify React js web development.

Tools/approaches that are useful to know for experienced Reactjs developers: 

• Toolchains like Next.js or Gatsby provide an environment for developing with React.js (to reiterate: React.js is a library, not a framework, so you’d need an IDE to use it).
• Flow/TypeScript/any other bug- or type-checker.  
• GIT & strong knowledge of version control. 
• CI/CD approach to product development. 

Junior React.js Developers

Junior is a beginner in React js website development who has at least six months of experience and at least one completed project. They solve typical problems and work under the guidance of a mentor who checks the code, fixes errors, and makes recommendations.

A junior React developer should know:

• Features of the cross-browser and adaptive layout so that the website opens correctly on all devices and browsers.
• HTML and CSS to perfection, JavaScript at a basic level.
• The main components, events, states, and forms of the React library.

The main task of a junior React web developer is to work on the quality of their code, improve hard skills, and constantly self-educate.

Interview questions for junior React.js developers

What are the React components? Why are components so important to React?

Components are the building blocks that React uses to build the user interface of websites and apps.

What does setState do?

It’s a function that connects the new object to the current state. When the state is updated, the component gets re-rendered. 

What’s the difference between functional and class components? 

Functional components use a JS function that accepts the input and returns a React element. Class components use the ES6 class to define the same component. 

Middle-Level React.js Developers

A middle engineer is a specialist who has software development experience of at least two years and has created various websites and web applications. 

Requirements for a middle developer:

• Knows the Javascript language at an advanced level.
• Expert in React, but also in using other tools for it, e.g. Redux, MobX, or RxJS.
• Proficient with the Git version control system and the GitHub service.
• Understands the features of asynchronous development.
• Well-versed in web APIs.

They can work independently according to the project’s requirements and write code that does not need to be checked.

Interview questions for middle React.js developers

How can you accelerate interactions between React app and browser events? 

_SyntheticEvent wrapper does that. 

Describe the difference between Flux and MVC architectural pattern 

MVC separates the data, UI, and logic of the app into three parts: Model, View, and Controller. It gets harder to maintain MVC apps as they get updated, plus it’s hard to preserve data integrity. 

In Flux, all data flows through the Store. Changes to the Store data are transmitted to Views through events, so Views (UI) gets updated from one place. To change Store data (get Views updated), the central Dispatcher can fire Actions. There can be only one change to the data in a Store per one Action. That makes updates much more consistent and it’s easier to maintain data integrity. 

Senior React.js Developers

Senior is a professional with 4–5 years of web application development experience. 

Requirements for a senior Reactjs developer:

• Understands algorithms and data structures, principles of object-oriented programming, and design patterns.
• Knows in-depth JS, various libraries, and JavaScript frameworks, for example, Vue.js and Angular.js. 
• Knows how to use backend tools: Typescript, Node.js, MongoDB, etc.

If you want to hire dedicated React js developer check not only their hard but also soft skills. For example, time management skills and knowledge of flexible methodologies for project management — Agile, Kanban, Scrum, and tools for them — Jira, Trello, Notion, etc.

Interview questions for senior React.js developers

Tell us about lifecycle methods 

Here, the candidate has to describe the difference between mounting, updating, and unmounting categories and what are the best conditions to use them.  

What are the main drawbacks of React? When should you absolutely not use React.js? 

Tip: Realism goes a long way in an interview. Senior-level developers must be able to freely find technical solutions to high-level business problems. So, let them describe business problems React.js is not able to solve. 

Feel like Reactjs development services are exactly what your project needs? Contact Expert Remote to hire top-notch Reactjs programmers.