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How To Hire A JavaScript Developer

Front-end development relies primarily on the JavaScript programming language. Developers can add interactivity, dynamic content, and enhanced user experiences to websites and web applications using JavaScript. It is a versatile language that can be used for various applications, including web development, single-page applications (spas), mobile applications, game development, IoT applications, and more.

JavaScript has a rich ecosystem of frameworks and libraries that simplify and accelerate development processes.

JavaScript Developers: Why are they needed?

JavaScript developers play a vital role in designing and implementing the user interface (UI) and user experience (UX) of web applications. They leverage JavaScript frameworks like React, Angular, and Vue.js, libraries, and tools to build intuitive and visually appealing interfaces that enhance usability and optimize user interactions.

Additionally, JavaScript developers are needed to develop dynamic web applications, enable cross-platform mobile development, enhance user experiences, and build robust server-side systems. The need for JavaScript expertise spans from startups to large enterprises, making it a valuable skill set for job seekers. Companies might hire JavaScript developer for their expertise in building web applications, front-end and back-end development, and and leveraging the extensive ecosystem of libraries, frameworks, and tools that augment JavaScript's functional spectrum.

Skills required

  • Libraries and frameworks
  • AJAX (Asynchronous JavaScript and XML)
  • Node.js
  • Asynchronous Programming
  • Debugging and Testing
  • Analytical Thinking

Job titles

  • Front-End Developer
  • Full-Stack Developer
  • Front-End Engineer
  • Back-End Developer
  • Web Developer
  • Mobile App Developer

JavaScript Developer Interview Assessment

The most common assessment framework for JavaScript Developers on HackerEarth includes

A combination of technical evaluations, coding exercises, and behavioral assessments. Here are some common components of the assessment framework:

Code completion task

In the JavaScript developer hiring assessment, developers are asked to solve programming problems using JavaScript. This could include testing the candidate’s knowledge of algorithms, data structures, JavaScript concepts, or specific frameworks/libraries. Coding challenges assess a developer's problem-solving skills, ability to write clean and efficient code, and familiarity with JavaScript core concepts, syntax, and features.

Multiple-choice questions (MCQs)

A good way to assess a developer's technical knowledge of JavaScript concepts, language features, and best practices is through MCQs. They help evaluate a developer's understanding of JavaScript fundamentals. These questions should be included in the Javascript developer interview assessment. It will help you assess and hire javascript developer who is a good fit for your company.

Framework-specific questions

If the role requires specific Javascript developer skills, such as Angular or React, you can include such questions that test their knowledge of the framework's architecture, features, and common development tasks. Questions can range from framework-specific concepts to hands-on coding exercises using the framework. Depending on your project requirements, you should include these questions in order to hire javascript developer with the specific skillset.

Architectural or design questions

In the JavaScript developer hiring assessment, developers can be asked to design the architecture of a JavaScript application or discuss the best practices for structuring and organizing code in a JavaScript project. Architectural or design-related questions evaluate a developer’s understanding of JavaScript design patterns, modularity, and scalability. Hire Javascript developer who understands these basics well.

Our bias-free, objective platform has facilitated 1,00,000+ assessments

Steps to Create a JavaScript Developer Assessment on HackerEarth

  1. Log in to Hackerearth assessments
  2. Add questions from our library and create a test
  3. Send invites to candidates
  4. Evaluate our AI-assisted report and shortlist candidates

Assess JavaScript developers for free

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Sample Questions to Ask a JavaScript Developer

  • Write a JavaScript function that takes an array as input and returns a new array with only the unique elements from the original array. Duplicate elements should be removed.
  • Implement a sorting algorithm of your choice (such as Bubble Sort, Selection Sort, or Merge Sort) in JavaScript. Explain the algorithm and provide the code.
  • Write a JavaScript function that calculates the sum of the factorials of all numbers from 1 to a given number.
  • Write a JavaScript function that takes an array of integers (with a range from 1 to n) and returns the missing number.

  • Which of the following is NOT a JavaScript data type?
    1. String
    2. Boolean
    3. Object
    4. Integer

  • What does the === operator in JavaScript compare?
    1. Value and types
    2. Values only
    3. Types only
    4. None of the above

  • Which of the following is the correct way to define a function in JavaScript?
    1. function = myFunction() {}
    2. function myFunction() {}
    3. var myFunction = function() {}
    4. All of the above

  • What is Angular, and how does it differ from AngularJS?
  • Explain the concept of modules and components in Angular.
  • What is dependency injection in Angular, and why is it important?
  • Describe Angular's template syntax and how data binding works.
  • What is the purpose of Angular services, and how can they be used?

  • What is MVC (Model-View-Controller) architecture and how can it be applied to JavaScript applications?
  • Discuss the benefits and drawbacks of a monolithic architecture versus a microservices architecture for a JavaScript-based project.
  • Describe the concept of a single-page application (SPA) and discuss the advantages and challenges associated with building SPAs using JavaScript frameworks.
  • What is the role of a state management library (such as Redux or Vuex) in JavaScript applications, and how does it help manage application state?
  • Discuss the concept of serverless architecture and how JavaScript can be utilized in serverless functions or applications.

These sample questions provided here are for interviewing early-experience talents. For more customized assessments for candidates with higher experience, you can contact our team at or request a demo here.

Guidelines for Writing Job Descriptions for JavaScript Developers

Job title

In the JavaScript Developer job description, begin with a clear and concise job title that reflects the role, such as "JavaScript Developer", "JavaScript Engineer”, “JavaScript Programmer”, “Frontend JavaScript Developer”, or “JavaScript Software Engineer". Having a clear title will make the search easier for the candidates.

Job summary

Provide a brief overview of the position, emphasizing the key responsibilities and objectives when you are writing a JavaScript Developer job description. Describe the role's primary focus and how it contributes to the company's goals. To hire JavaScript developer for your company, its important to highlight the necessary details for the role.


The JavaScript developer job description should also outline the specific tasks and responsibilities that they will be expected to handle. This may include:

  • Writing clean, efficient, and maintainable JavaScript code.
  • Developing and maintaining software applications using JavaScript frameworks and libraries.
  • Collaborating with cross-functional teams to understand requirements and translate them into technical solutions.
  • Conducting code reviews and ensuring adherence to coding standards.
  • Participating in the entire software development lifecycle, including design, development, testing, and deployment.

Skills and qualifications

List the essential JavaScript developer skills and qualifications that candidates must possess, including, but not restricted to:

  • Proficiency in JavaScript and frameworks (e.g., Angular, React, Vue.js, Ember.js)
  • Experience with front-end technology like HTML5, CSS3, and responsive design techniques
  • Knowledge of server-side JavaScript frameworks like Node.js
  • Ability to identify and fix bugs in JavaScript code using debugging tools
  • Understanding and practical knowledge of asynchronous programming concepts, including promises, async/await, and callbacks

Preferred skills

To hire the right candidate for the job you should also mention any additional JavaScript developer skills or qualifications that would be beneficial. You can also ask for experience with specific tools, libraries, or domains.

Education and experience

The JavaScript developer job description should also specify the educational background and professional experience required for the position. This could range from a bachelor's degree in computer science or a related field to several years of relevant experience. Listing these points will make it easier for you to find JavaScript developer for your project. You should always aim to hire JavaScript developer with the best and up-to-date skills.

Company culture and EVPs

Briefly highlight your company's culture, values, and any unique perks or benefits offered to employees that can help attract candidates who align with your company's ethos. It will also help you hire a JavaScript developer who is best fit for your company.

Application instructions

While writing a JavaScript developer job description, you should also provide instructions on how candidates can apply for the position. Include details such as where to send their resume, portfolio, or other required documents. Also, specify the deadline for applications, if applicable.

Equal Opportunity Statement

Include a statement affirming that your company is an equal opportunity employer committed to diversity and inclusion. It will attract the right candidates and hence will help you hire the best from them.

You can always make your job descriptions more gender-neutral by following simple steps like using gender-neutral pronouns like ‘they/them’. It is also a good practice to map your developer persons to your job profiles before you post an open role.

Download our guide for writing better developer personas

How to Conduct JavaScript Developer Job Interview

Skill-first hiring requires that the developer interview process be designed for understanding the candidate’s skill and experience in the given domain. You can consider the following guidelines when conducting a face-to-face interview with a JS developer:

Conduct a real-time technical assessment

The interviewee would most likely have completed a take-home assessment before the interview. However, using the interview platform to assess skills in real-time will tell you a lot about the candidate’s communication skills and thought process - skills which are not evident in an assessment.

HackerEarth’s flagship tech interview platform FaceCode has a built-in question library you can use to test the candidate’s knowledge of JavaScript programming concepts, data structures, algorithms, and libraries/frameworks. The built-in IDE environment can be used for assessing their ability to write clean, efficient, and maintainable code. You can also use the pair-programming method to observe their problem-solving approach, logical thinking, and attention to detail.

Understand the candidate’s project experience and review the portfolio

During the JavaScript developer hiring assessment, discuss the candidate's past projects, work experience, and contributions. Ask them to describe a JavaScript project they worked on and their specific role and responsibilities. Review their portfolio or code samples, if available, to assess their coding style, documentation practices, and other JavaScript developer skills.

Understand if they are a good culture and team fit

Another important thing to test during the JavaScript developer interview assessment is whether the candidate is a good cultural fit or not. While skills make a good developer, one cannot negate the importance of culture fit in the developer world. The best person for the role needs to have more than accurate coding skills. They need to be able to communicate and partner effectively in highly agile or collaborative environments. It is important to assess a candidate’s ability to work independently and as part of a team through hypothetical scenarios that show how they handle challenges, conflicts, or deadlines.

This is also a good opportunity for engineering managers to showcase their team culture and values and find a candidate who aligns well with the same.

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The top candidates will have a strong understanding of JavaScript programming language and its frameworks (such as React, Angular, or Vue.js). They should also have experience with web development, knowledge of front-end technologies and responsive design techniques, proficiency in using JS libraries, and familiarity with server-side JavaScript frameworks like Node.js. These are a few important Javascript skills that you need to look for in a JavaScript developer.

It depends on the role specifications. If a company is hiring for a full-stack JavaScript developer then the candidate is required to have expertise in both front-end and back-end development. If you are looking for a specialized front-end developer with JavaScript experience, then back-end skills won’t be necessary.

While responsive web design and mobile development are crucial JavaScript skills and may not be mandatory for every JavaScript developer role, possessing these skills can greatly enhance a developer's versatility and increase their value in the industry. Hire those developers who are well versed in these skills an are willing to learn new skills that the job may require.

Some commonly used database technologies and tools include relational databases like MySQL, PostgreSQL, and Microsoft SQL Server, and NoSQL databases like MongoDB and CouchDB. Some popular object-relational mapping (ORM) tools for working with databases in JavaScript include Mongoose (for MongoDB), Sequelize (for MySQL, PostgreSQL, and SQLite), and Knex.js (a query builder for multiple databases). You should hire JavaScript developer who is familiar with at least one of these database technologies.

To write well-structured and maintainable code, the candidates should be familiar with some specific JavaScript design patterns and architectural concepts. For example, MVC (Model-View-Controller), MVVM (Model-View-ViewModel), and SOLID Principles (Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion). You should also find out what kind of technologies your project requires in order to hire JavaScript developer that is the best fit for the role.