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A guide to hiring JavaScript developer

Recruitment | 6 Min Read

A guide to hiring JavaScript developer


As the world undergoes rapid digitalization, every business needs to maintain an online presence through websites or mobile applications. JavaScript provides an easy-to-use, robust, and lightweight scripting language to create web pages and apps. Hence, it has become a popular language for web app creation, game development, and many more. A Statista report shows that around 65% of respondents utilized JavaScript, which makes it one of the most widely and commonly used languages by programmers.

According to Mercer | Mettl’s Tech Skills and Trends report 2022; JavaScript developers are among the most in-demand professionals in the tech industry.


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With the rising demand for JavaScript developers, selecting the best one for the company takes careful research and evaluation. This article covers details about hiring JavaScript developers and how Mercer | Mettl can assist.


Who is a JavaScript developer?

JavaScript is the most robust operational support system (OSS) module for building interactive websites, engaging user interfaces, and flexible front-end designs. The website’s programming, development, and implementation associated with construction fall under the purview of JavaScript developers.

JavaScript developers additionally collaborate with front-end web developers for markup and styling of the web app and back-end developers to improve the website’s functioning and speed. Hence, JavaScript developers need to know not only JavaScript programming but also have a fundamental understanding of different frameworks.


Roles and responsibilities of a JavaScript developer

JavaScript developers are responsible for completing the design of applications and software using Java programming language. They carry out many roles based on their critical duties in organizations, which are broadly categorized as front-end, back-end, or full-stack.


1. Front-end JavaScript developer


The primary function of a front-end JavaScript developer is to create a visual website interface, such as animations, buttons, carousels, drop-down lists, and other elements. They must create feature-filled functional websites and online programs to improve user experience.

The key responsibilities of a front-end JavaScript developer are:

  • Ensure good website and app performance
  • Write quality JavaScript code
  • Build e-commerce sites using content management systems (CMS)
  • Run UI tests
  • Create RESTful APIs


2. Back-end JavaScript developer


Back-end JavaScript programmers improve the site’s function and create an intuitive and responsive website. They optimize the website’s performance and ensure that it runs at its best under various load conditions.

Together with front-end developers, back-end JavaScript developers are accountable for analyzing workflows, writing code to implement server-side website functionality, producing reusable code, safeguarding website data and user privacy, and putting storage solutions in place.

Their duties also include the following:

  • Developing apps and services by integrating the front end and server using coding languages like Python, Java, Perl, and Ruby.
  • Creating solutions for the Linux, Mac OS X, and Ubuntu operating systems.
  • Cooperating with cloud service providers.


3. Full-stack JavaScript developer


Full-stack JavaScript developers design both the front and back end of a website. They have excellent programming skills in various languages, such as C#, CSS3, HTML5, Java, JavaScript, PHP, Python, Perl, Ruby, and others.

These professionals utilize front-end technologies and frameworks like AngularJS, JQuery, and REACT and create databases using SQL, Oracle, MongoDB, and Redis servers.


Must-have skills for a JavaScript developer

JavaScript is among the fastest-growing programming languages, and many organizations create and manage their website pages through JavaScript.

Some technical skills that every JavaScript developer should possess are:


Technical skills of a JavaScript developer


Front-end JavaScript developer

A front-end developer needs the following skills:

  • Code review: The developer must be able to identify problems, which simplifies writing better code or changing a few sections of the code.
  • Project architecture knowledge: The developer works with existing layers and architecture, so they should be familiar with design patterns. The ability to implement new features into the existing architecture and comprehend design patterns/principles ensures development efficiency.
  • HTML and CSS knowledge: A JavaScript developer must understand HTML and CSS because these are closely linked to the front end of an application.
  • Testing: The JavaScript developer must be familiar with test-driven development, unit testing methodologies, and test automation infrastructure.
  • The Angular and React libraries: Since JavaScript libraries and frameworks provide tools for building sophisticated and contemporary websites, developers should understand these frameworks.

Back-end JavaScript developer

A back-end developer needs the following skills:

  • Project architectural knowledge: JavaScript developers need to be aware of the model-view-controller (MVC) and the types of architecture. It helps recognize common design patterns and integrate new features into existing systems.
  • Understanding NodeJS: NodeJS platform transforms JavaScript into a multipurpose language that helps build a robust website back-end.
  • CI and VCS knowledge: The developer needs to monitor changes made to the web application or website created using the version control system (VCS). They additionally need to adopt continuous integration (CI) to merge the code into a repository and use automated testing for issues.

Soft skills of a JavaScript developer

The right set of technical skills should be paired with relevant soft skills. These are listed below:

  • Attention to detail
  • Communication skills
  • Creativity
  • Critical thinking
  • Problem-solving ability
  • Teamwork
  • Work under stress


Tips for hiring the right JavaScript developer

When hiring a JavaScript developer, HR managers should consider prior experience, work portfolio, and technical skills. Some tips for hiring a JavaScript developer are:



Check the candidate's portfolio

The candidate’s portfolio helps evaluate the technology stack the candidate has previously worked with. It further explains the applicant’s involvement in overall software or app development, which clearly indicates their knowledge and skills.

For example, when hiring a full-stack developer, you need to know that the candidate has worked on both front-end and back-end development in the past and not just front-end development. The candidate’s portfolio can help you analyze their expertise and the quality of their work.

Evaluate hands-on experience

A candidate’s experience is a learned skill developed through the years. Therefore, an entry-level JavaScript developer may exhibit different skills than an advanced-level developer.

Hire experienced professionals for crucial roles, as it improves the core competencies of the developer and helps them resolve real-world problems quickly. These professionals are better equipped to find flexible solutions to critical issues.

Assess JavaScript skills

Hiring managers may receive various applications for the JavaScript developer role. However, shortlisting these resumes and finding valuable portfolios is time-consuming and hectic. Including a Technical Assessment at this stage may help select the strongest candidates from the list.

Mercer | Mettl’s Codelysis helps find the best JavaScript developer based on your business requirements. Analyze every candidate’s CSS, HTML, front-end, and back-end JavaScript knowledge and expertise.

Analyze open-source experience

Open-source projects give an insight into the developer’s innovation acumen. Anyone from the developer community can access these code files or software to suggest changes and improvements. Therefore, developers learn about multiple hidden and unknown details of code.

Hiring a JavaScript developer with open-source experience can help you ensure efficient software development.

Ensure privacy knowledge

JavaScript developers should understand the increasing importance of data privacy. It means they should know government regulations and ongoing cyber threat methods to eliminate potential loopholes in the code.

Hiring a developer with relevant website or app privacy knowledge helps you safely manage regulations and protect your users’ sensitive information.

Evaluate references

When hiring a JavaScript developer for a senior job role, evaluate the references offered by the candidate. Know what previous clients, bosses, and team members think of their work experience and workplace efficiency. It will help you analyze whether the candidate is a good fit for the future.

Ask non-technical questions in the interview

It is necessary to ask non-technical questions in the interview to understand the candidate’s interpersonal and soft skills.

Some examples of non-technical interview questions:

  • What marker would you use to measure a software project’s success?
  • What are some metrics you would use to understand the project’s progress?
  • Talk about a project in which you failed to deliver expected outcomes.
  • How would you handle a disagreement with your manager?


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Essential questions to ask for recruiting a JavaScript developer

  1. What is their expertise in MEAN (MongoDB, Express, AngularJS, and Node.js)?
  2. What is the difference between the one-way flow of data and two-way data coupling?
  3. Which platforms are you most experienced with?
  4. Give an example of the use-case of Prototypal OO in JavaScript.
  5. Give an example of the use-case of functional coding in JavaScript.
  6. What is the difference between classical and prototypal inheritance?
  7. What are the drawbacks of using JavaScript?
  8. What are the benefits of using JavaScript?


How Mercer | Mettl can help hire a JavaScript developer

Mercer | Mettl’s online examinations, simulations, and interviewing platforms help hire developers, programmers, and coders. With the right assessment, you can ease the process of hiring JavaScript developers and find a good fit for your company. Some assessments that Mercer | Mettl offers to hire the best JavaScript developer are:


Mercer | Mettl Codelysis


Mercer | Mettl Codelysis is a powerful, customized coding simulator that assesses hands-on experience and abilities in real-world circumstances. It can assist in hiring JavaScript engineers based on critical factors such as:

  • Structure of the code
  • Code replay to better comprehend the test-cognitive taker’s flow
  • Measure of software similarity (MOSS)
  • Assessment of hands-on coding skills


Mercer | Mettl Xathon


Xathon is a virtual hackathon system. It provides high flexibility in recruiting, learning and development, and organizational management. When used to hire JavaScript developers, it is a useful tool for:

  • Problem-solving and innovation competitions
  • Brainstorming training to generate new thought patterns
  • Case study contests


Mercer | Mettl I/O


It is a one-of-a-kind system for role-based, real-time coding initiatives across several prominent roles and technologies. It provides a virtual platform for coding and programming positions, data scientists, and quality assurance engineers. Mercer | Mettl I/O is suitable for evaluating both front-end and back-end programmers.



There is a growing need for JavaScript developers and front-end engineers. JavaScript is a lightweight programming language, which is why it is widely used for front-end development and server-side scripting.

Hiring the right JavaScript developer is the key to improving productivity and reducing time/money spent on development. Therefore, we have discussed valuable tips and details in this blog to help you with JavaScript developer recruitment.



Where do I find JavaScript developers?

What does a JavaScript developer do?

Is there a demand for JavaScript developers?

What are the skills needed for a JavaScript developer?

What are some advantages of JavaScript?

What are the data types that JavaScript supports?

Originally published November 18 2022, Updated November 24 2022

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About This Topic

Hiring a coder requires HRs to go beyond conventional hiring practices and assess the candidate on both knowledge and hands-on skills. A holistic suite of assessments and simulators, used in conjunction, can simplify the technical hiring process and better evaluate programmers and developers.

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