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Rishabh is a software engineer having 7+ years of experience in designing front-end web applications and is expertised in web development.
Mahesh is a software engineer having 3+ years of experience in developing dynamic single page web applications and mobile apps using ReactJS and NodeJS.
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.
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What is React Js?
If you are a company looking to hire young and talented ReactJs Developers, then this detailed guide will help you delve into how to hire ReactJS developers and the required skills and interview questions while hiring these developers. It also outlines how your company can hire ReactJs Developers and what things you should consider while hiring them!
Why is ReactJS a choice for web development?
ReactJS is known for its high performance, achieved through its virtual DOM (Document Object Model). Instead of updating the entire DOM, React only updates the specific components that have changed, leading to faster rendering times and improved overall performance.
ReactJS allows developers to create reusable components, which can be easily used in different parts of an application. This quality saves time and effort by eliminating the need to write code from scratch for every component, resulting in more efficient and streamlined development processes.
3. Large Community Support
ReactJS has a large and active community of developers who regularly contribute to the development of the library. This community provides resources, tutorials, and support, making it easier for developers to learn and use ReactJS effectively.
ReactJS can be used for both client-side and server-side rendering, making it a flexible option for web development. It also works well with other technologies, such as Redux for state management, GraphQL for data fetching, and Next.js for server-side rendering.
5. Easy to Learn and Use
ReactJS has a relatively shallow learning curve, making it easier for new developers to learn and execute the language. Additionally, React’s component-based architecture is intuitive and easy to understand, which makes it easier to write clean and maintainable code.
ReactJS has thorough documentation, which makes it easy to learn and use. The documentation includes examples, tutorials, guides, and a complete API reference, making it easy for developers to get up to speed quickly and effectively using ReactJS in their projects.
How to hire a ReactJs Developer?
Hiring a ReactJS developer can be challenging, as it requires finding the right candidate with the necessary skills and experience. Thus, following a step-by-step process for hiring a ReactJS developer is crucial for a company. The steps are as follows:
1. Determine the Required Skills and Experience
2. Create a Clear Job Description
Create a clear and concise job description that outlines the required skills, experience, and responsibilities of the ReactJS developer. This job description should also include information about the company and the project the developer will be working on.
3. Source Candidates
There are various ways to source candidates, such as job boards, social media, and referrals. You need to decide on a suitable way to hire for your company. It is also beneficial to attend industry events and conferences to network with potential candidates.
4. Conduct Initial Screening
Once you have a pool of potential candidates, conduct initial screenings, such as phone or video interviews, to assess their skills and experience. This process helps narrow the pool of candidates and identify those who fit the role well.
5. Technical Assessment
After the initial screening, conduct a technical assessment to test the candidate’s ReactJS skills. It can be in the form of a coding challenge or an on-site technical evaluation.
6. In-Person Interviews
Invite the top candidates for an in-person interview after the technical assessment. It can also help to assess the candidate’s communication skills, work style, and cultural fit with the company.
7. Check References
Before making an offer, check the candidate’s references to ensure they have a track record of delivering quality work and collaborating effectively with others.
What are the must-look skills while hiring a ReactJs Developer?
When hiring a ReactJS developer, several skills and qualities are essential to ensure the success of your project. The most important skills to consider when hiring a ReactJS developer are listed below.
2. Proficiency in ReactJS
A ReactJS developer should deeply understand ReactJS and its core concepts, such as components, JSX, props, state, and lifecycle methods. They should also be familiar with React Router and Redux for state management.
3. Experience with Related Technologies
ReactJS is often used with other technologies like Node.js, GraphQL, and MongoDB. A ReactJS developer should have experience with these technologies and understand how they integrate with ReactJS.
4. Understanding of Web Technologies
A ReactJS developer should have a solid experience in web technologies like HTML, CSS, and the Document Object Model (DOM). They should also be familiar with web development concepts like responsive design, cross-browser compatibility, and accessibility.
5. Experience with Agile Development Methodologies
ReactJS development often involves working in a team environment using Agile methodologies like Scrum or Kanban. A ReactJS developer should have experience working in an Agile environment and understand how to collaborate effectively with other team members.
6. Strong Problem-Solving and Communication Skills
A ReactJS developer should be a problem solver, capable of identifying and resolving complex issues. They should also have strong communication skills to articulate their ideas and collaborate with other team members effectively.
What are the best ways to hire a ReactJs Developer?
Hiring a ReactJS developer is a crucial decision that can impact the success of your project. There are various ways to hire a ReactJs developer, but you must consider the best solutions depending on your need. So, here are the ways by which you can hire a ReactJs developer.
1. In-House Hiring
In-house hiring of a ReactJS developer involves hiring a full-time employee who will work on-site at your company. To draw a contrast, some of the pros and cons of in-house hiring are given below:
With in-house hiring, you have direct control over the development process and can closely monitor progress and performance.
Your hiring options are limited to the candidates who are available in your local area, which can be a disadvantage if you need a highly specialized ReactJS developer.
In-house developers can work more closely with other team members, making communication and collaboration easier and more effective.
In-house developers are more expensive than freelancers or outsourced developers due to the added costs of benefits, infrastructure, and training.
In-house developers tend to be more loyal to the company and are better integrated into the company’s culture, which can lead to a better working environment and improved productivity.
In-house developers require a long-term commitment, which can be a disadvantage if you need to scale back your development team or adjust your project’s focus.
In-house developers can share knowledge and best practices with other team members, improving the quality of the development process and the final product.
In-house hiring requires a significant investment of time and resources, and hiring mistakes can be costly and time-consuming.
In-house developers can be trained and developed over time, allowing you to build a highly skilled and specialized development team that can tackle complex projects.
Outsourcing of ReactJS developers involves hiring an external company or individual to handle the development of your project. Some of the advantages and disadvantages of outsourcing ReactJS developers are given below:
Outsourcing allows you to tap into a vast pool of ReactJS developers from around the world, giving you access to highly specialized and experienced talent.
When working with an offshore team, communication can be difficult due to language barriers or time zone differences.
Outsourcing can be more cost-effective than hiring an in-house developer, as you don’t need to pay for infrastructure, benefits, or training.
With an outsourced team, you may not have direct control over the quality of the development process or the final product, which can be a concern.
Outsourcing can help you accelerate your development process and get your product to market faster, as external teams often have more resources and experience.
There is always a risk of intellectual property theft or data breaches, which can be a significant concern for some businesses.
Outsourcing allows you to scale your development team up or down as needed, giving you more flexibility to adjust to changes in your project’s scope or budget.
Outsourced developers may not be as loyal to your company as in-house developers, which can lead to a lack of commitment or investment in the project.
Outsourcing can help you streamline your administrative tasks, as you don’t need to manage an in-house team or handle HR-related issues.
3. Freelance Hiring
Freelance hiring of ReactJS developers involves hiring an individual developer who works independently and remotely without being part of a larger team or organization. These kinds of developers are hired on a project-by-project basis. To help you make a wise choice, some of the benefits and drawbacks of freelance hiring are given below:
Freelance developers are often less expensive than hiring an in-house developer or outsourcing to an external team, as they typically have lower overhead costs.
Freelancers often work with multiple clients simultaneously, their availability can be limited, making it challenging to schedule meetings or get the desired done quickly.
Freelancers often have specialized expertise in a specific area, which can be valuable if you’re looking for someone with experience in a particular field or technology stack.
Working with a remote freelancer can be challenging, as there may be communication barriers or difficulties in coordinating schedules.
Freelancers are often more flexible in their work arrangements, allowing you to adjust their workload or hours based on your project’s needs.
As with outsourcing, you may not have direct control over the quality of the development process or the final product when working with a freelancer.
Freelancers can often work more quickly than a full-time employees, as they are solely focused on your project and don’t have other company-related distractions.
If the freelancer becomes unavailable or decides to stop working on your project, finding a replacement familiar with your codebase and project requirements can be challenging.
Hiring a freelancer can reduce your overhead costs, as you don’t need to pay for benefits, office space, or other expenses associated with hiring an in-house developer.
What are the key responsibilities of a ReactJs Developer?
The key responsibilities of a ReactJS developer may vary depending on the job description and project requirements. However, some common responsibilities that a ReactJS developer may be expected to handle include the following:
1. Developing User Interfaces
A ReactJS developer should be able to build user interfaces using ReactJS and other relevant libraries, ensuring that the interfaces are responsive and user-friendly.
2. Collaborating with Designers
ReactJS developers should collaborate with designers to ensure that the user interfaces meet the design requirements and are visually appealing.
3. Writing Clean Code
ReactJS developers should write clean, maintainable, and reusable code that adheres to best practices, coding standards, and industry guidelines.
4. Testing and Debugging
ReactJS developers should test and debug the code to ensure it meets the functional requirements and is free from errors or bugs.
5. Maintaining Codebase
ReactJS developers should maintain the codebase by updating the code, fixing bugs, and refactoring the code to ensure that it is efficient, scalable, and maintainable.
6. Keeping Up to Date with Latest Technologies
ReactJS developers should stay up-to-date with the latest technologies and trends in web development, ensuring that they can develop high-quality user interfaces that meet the changing demands of the industry.
Must Ask Interview Questions While Hiring ReactJs Developer?
Hiring a ReactJS developer requires a thorough assessment of their technical skills, problem-solving abilities, and compatibility with the team. Here are some must-ask interview questions that can help you evaluate the candidate’s proficiency and experience with ReactJS:
Q1. What motivated you to learn ReactJS?
There are several reasons why I wanted to learn ReactJS. Firstly, it’s a popular and widely-used technology in the web development industry, making it a valuable skill. ReactJS has a reputation for being fast and efficient, which I find appealing. Finally, I was drawn to ReactJS because of its component-based architecture, which makes it easy to create reusable UI elements.
Q2. What are the critical features of ReactJS?
Some of the critical features of ReactJS include the use of a Virtual DOM, the ability to create reusable components, a declarative approach to programming, and compatibility with other libraries and frameworks.
Q3. Can you explain the concept of Virtual DOM?
The Virtual DOM is a lightweight, in-memory representation of the actual DOM. ReactJS uses the Virtual DOM to keep track of changes to the UI and efficiently update the real DOM only when necessary, which helps to improve the performance of ReactJS applications.
Q4. How do you optimize performance in ReactJS applications?
Several strategies can be used to optimize performance in ReactJS applications, including minimizing the number of re-renders, implementing shouldComponentUpdate, using React.memo or useMemo, and using server-side rendering.
Q5. How do you handle state management in ReactJS?
State management in ReactJS can be handled using the useState hook, which allows you to define and update state within functional components, or by using a state management library like Redux.
Q6. Can you describe the component lifecycle in ReactJS?
The component lifecycle in ReactJS includes several methods that are called at different stages of a component’s existence, including constructor, render, componentDidMount, componentDidUpdate, and componentWillUnmount.
Q7. What is JSX, and how is it used in ReactJS?
Q8. What are Higher-Order Components in ReactJS?
Higher-Order Components (HOCs) is a pattern in ReactJS that allows you to wrap a component with another component to add additional functionality or behavior.
Q9. How do you handle data flow between components in ReactJS?
Data flow between components in ReactJS can be handled using props, which allow you to pass data from a parent component to a child component or by using a state management library like Redux.
Q10. Can you explain the difference between controlled and uncontrolled components in ReactJS?
Controlled components have their state managed by ReactJS, while the DOM manages uncontrolled components. Controlled components allow for more fine-grained control over the behavior of the component.
Q11. What is Redux, and how is it used with ReactJS?
Q12. How do you handle server-side rendering with ReactJS?
Server-side rendering with ReactJS can be handled using libraries like Next.js or Gatsby, which provide tools and frameworks for building server-rendered ReactJS applications.
Q13. Can you describe the difference between prop and state in ReactJS?
Props are used to pass data from a parent component to a child component, while the state is used to manage data within a component.
Q14. Have you used React Hooks? If so, can you explain how you have used them?
Yes, I have used React Hooks, such as useState and useEffect, to manage state and handle side effects in functional components.
Q15. How do you ensure accessibility in ReactJS applications?
Accessibility is a crucial aspect of web development, and it’s essential to ensure that ReactJS applications are accessible to users with disabilities. Here are some ways to ensure accessibility in ReactJS applications:
- Use semantic HTML: Use HTML elements that convey the correct meaning and purpose of the content. For example, use the “button” element for buttons and the “label” element for form labels.
- Add alt text to images: Include descriptive alt text for images to provide context for users who cannot see them.
- Ensure keyboard navigation: Users who cannot use a mouse rely on keyboard navigation. Ensure that only the keyboard can access and activate all interactive elements.
- Use ARIA attributes: Accessible Rich Internet Applications (ARIA) attributes provide additional information about the purpose and structure of web elements. Use them to improve the accessibility of your ReactJS application.
- Test with screen readers: Use a screen reader to test your application and ensure it’s fully accessible to users who rely on them.
Want to hire Remote ReactJS developers on your own? Here are the skills you must look for while hiring a ReactJS programmer
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:
- 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 .
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..
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.
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.
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.
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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.
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
- 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.
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.
If you are trying to Hire a React.Js Developer. Here is the React.Js Developer Job Description that you can use in your hiring.
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.