How to hire for a React JS Developer?

 Summary:

React.js Developers design and implement user interface components for JavaScript-based web and mobile applications using the React open source library ecosystem. These skilled front-end developers are involved in all stages of interface component design, from conception through to final testing. 

Standard Job Description: 

React is a front-end library developed by Facebook. It is used for handling the view layer for web and mobile apps. ReactJS allows us to create reusable UI components. It is currently one of the most popular JavaScript libraries and has a strong foundation and large community behind it. 

ReactJS is JavaScript library used for building reusable UI components. According to React official documentation, following is the definition ? 

React is a library for building composable user interfaces. It encourages the creation of reusable UI components, which present data that changes over time. Lots of people use React as the V in MVC. React abstracts away the DOM from you, offering a simpler programming model and better performance. React can also render on the server using Node, and it can power native apps using React Native. React implements
one-way reactive data flow, which reduces the boilerplate and is easier to reason about than traditional data binding. 

React Features 

1. JSX
? JSX is JavaScript syntax extension. It isn’t necessary to use JSX in React development, but it is recommended. 

2. Components
? React is all about components. You need to think of everything as a component. This will help you maintain the code when working on larger scale projects. 

3. Unidirectional
data flow and Flux ? React implements one-way data flow which makes it easy to reason about your app. Flux is a pattern that helps keeping your data unidirectional. 

4. License
? React is licensed under the Facebook Inc. Documentation is licensed under CC BY 4.0. 

React Advantages 

1. Uses virtual DOM which is a JavaScript object. This will improve apps performance, since JavaScript virtual DOM is faster than the regular DOM. 

2. Can be used on client and server side as well as with other frameworks. 

3. Component and data patterns improve readability, which helps to maintain larger apps. 

React Limitations 

1. Covers only the view layer of the app, hence you still need to choose other technologies to get a complete tooling set for development. 

2. Uses inline templating and JSX, which might seem awkward to some developers. 

React.js Developer will be responsible for developing and implementing user interface components using React.js concepts and workflows such as Redux, Flux, and Webpack. He/she will also be responsible for profiling and improving front-end performance and documenting our front-end codebase. 

Key Job Responsibilities:

1. Meeting with the development team to discuss user interface ideas and applications. 

2. Reviewing application requirements and interface designs. 

3. Identifying web-based user interactions. 

4. Developing and implementing highly responsive user interface components using React concepts. 

5. Writing application interface codes using JavaScript following React.js workflows. 

6. Troubleshooting interface software and debugging application codes. 

7. Developing and implementing front-end architecture to support user interface concepts. 

8. Monitoring and improving front-end performance. 

9. Documenting application changes and developing updates. 

Ideal Candidate: 

1. In-depth knowledge of JavaScript, CSS, HTML and front-end languages. 

2. Thorough understanding of React.js and its core principles. 

3. Experience with popular React.js workflows (such as Flux or Redux) 

4. Familiarity with newer specifications of EcmaScript 

5. Experience with data structure libraries (e.g., Immutable.js) 

6. Knowledge of isomorphic React is a plus. 

7. Familiarity with RESTful APIs 

8. Knowledge of modern authorization mechanisms, such as JSON Web Token. 

9. Familiarity with modern front-end build pipelines and tools. 

10. Experience with common front-end development tools such as Babel, Webpack, NPM, etc. 

11. Ability to understand business requirements and translate them into technical requirements 

12. Familiarity with code versioning tools (such as Git, SVN, and Mercurial) 

13. Excellent troubleshooting skills. 

Desired Education: 

Bachelor’s degree in Computer Science, Information Technology, or a similar field. 

Certifications Associated: 

1. MERN Stack Professional Certification 

2. Oracle Certified Associate Java Programmer 

3. Oracle Certified Professional Java Programmer 

4. Oracle Certified Professional Java Application Developer 

5. Oracle Certified Master Java Enterprise Architect 

Key Skills: 

Java, J2EE, Spring, PHP, NoSQL, Hadoop, Spark, Scala, Cassandra, JavaScript, Node JS, Angular JS, React JS, MongoDB, Elasticsearch, Redis, Bootstrap, TDD, Amazon AWS, AWS Lambda, Elastic Beanstalk, Heroku, Docker, Vagrant, Agile, Ruby, Ruby on Rails. 

Common Positions: 

1. React Developer 

2. ReactJS Developer 

3. Front-end Developer (React JS) 

4. Full stack developer Angular / React/ Node.JS 

5. React Frontend Developer 

6. Software Developer (React JS) 

7. JavaScript Developer 

8. MERN Stack Developer 

Screening Questions/Assessment Parameters:

1. Proficiency in JavaScript, including DOM manipulation and the JavaScript object model. 

2. Knowledge of REACT tools including React.js, Webpack, Enzyme, Redux, and Flux. 

3. Experience with user interface design. 

4. Knowledge of performance testing frameworks including Mocha and Jest. 

5. Experience with browser-based debugging and performance testing software. 

Basic Terminologies: 

1. Algorithm. An algorithm is basically a set of steps for carrying out certain tasks. 

2. Bug. A bug is an error that prevents a website or app from running as it should. 

3. Cache. A cache is a temporary storage space for data. 

4. Data structures. A crucial aspect of development and programming, data structures are a way of organizing and storing data for maximum efficiency. 

5. HTML. HTML stands for Hypertext Markup Language. Simply put, it’s a computer language used to create websites. 

6. MVP. The MVP or minimum viable product is the most pared-down version of a product that can be released to market. 

7. MySQL. MySQL is the world’s most popular open-source database management system. 

8. PHP. PHP stands for Hypertext Preprocessor, a server-side scripting language. 

9. Plugin. A plugin is basically an extension that adds extra functionality to an existing software. 

10. jQuery. jQuery is a JavaScript library. It simplifies the task of using JavaScript on your website by condensing several lines of JavaScript code into a single line. 

Industry Jargons: 

1. ES6, ES2015, ES2016, etc. These acronyms all refer to the most recent versions of the ECMAScript Language Specification standard, which the JavaScript language is an implementation of. 

2. Compilers. A JavaScript compiler takes JavaScript code, transforms it and returns JavaScript code in a different format. 

3. Bundlers. Bundlers take JavaScript and CSS code written as separate modules (often hundreds of them) and combine them together into a few files better optimized for the browsers. 

4. Package Managers. Package managers are tools that allow you to manage dependencies in your project. npm and Yarn are two package managers commonly used in React applications. Both are clients for the same npm package registry. 

5. CDN. CDN stands for Content Delivery Network. CDNs deliver cached, static content from a network of servers across the globe. 

6. JSX. JSX is a syntax extension to JavaScript. It is like a template language, but it has full power of JavaScript. 

7. Elements. React elements are the building blocks of React applications. An element describes what you want to see on the screen. 

8. Components. React components are small, reusable pieces of code that return a React element to be rendered to the page. 

9. props. props are inputs to a React component. They are data passed down from a parent component to a child component. 

10. state. A component needs state when some data associated with it changes over time. 

Benchmark Profile: 

Benchmark Profile on LinkedIn (1) 

Benchmark Profile on LinkedIn (2) 

Benchmark Profile on LinkedIn (3) 

Benchmark Profile on RMS(1) 

Benchmark Profile on RMS(2) 

Benchmark Profile on RMS(3) 

References:

https://www.tutorialspoint.com/reactjs/reactjs_overview.htm 

https://www.betterteam.com/react-js-developer-job-description 

https://www.toptal.com/react/job-description 

https://reactjs.org/docs/glossary.html  

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