Build Winning Teams with iMocha

JavaScript Skills to Look For While Hiring JavaScript Developer

Read More

Company News, Diversity & Inclusion, iMocha Engineering Product Updates Remote Hiring Skills Assessment

All Posts
24 February, 2023

JavaScript is a programming language used popularly for developing web applications, dynamic user interfaces, and server-side applications. It has become an essential skill for front-end, back-end, and full-stack developers.

As a result, hiring JavaScript developers can be a challenging task for recruiters or employers.

Before we look at the must-have JavaScript developer skills, let's understand what the data tells us:

  • Popularity: JavaScript is among the top-five most popular programming languages, with a TIOBE Index Rating of #4 as of 2023. This popularity means that there is a high demand for JavaScript developers. Another Stack Overflow report suggests that JavaScript is among the top-5 most 'wanted' technologies among developers.
most loved programming languagesImage Source
  • Salary: According to Glassdoor, the average base salary for a JavaScript developer in the United States is $95,962 per year.
  • Job growth: According to the Bureau of Labor Statistics, the job outlook for software developers, which includes JavaScript developers, is expected to grow 22% from 2019 to 2029. This is quicker than the average growth for all other occupations.

As a recruiter, if you are looking for a comprehensive list of useful JavaScript skills developers must possess, this guide is for you. Invest in the right platform and move ahead with the right knowledge to hire top-performing talent optimally.

Skills Required for JavaScript Developers Who Are Freshers

When it comes to junior developers, here are the must-have skills for JavaScript developers with little to no experience:

1. Basic knowledge of HTML, CSS, and JavaScript

2. Understanding of basic programming concepts like variables, loops, and functions

3. Familiarity with common JavaScript libraries and frameworks, such as React, Angular, or Vue

4. Understanding of basic data structures and algorithms

5. Ability to write code that is clean, maintainable, and efficient

6. Basic understanding of web development tools such as Git, Webpack, and NPM

7. Good problem-solving skills

8. Basic understanding of design principles and user experience


Struggling with time-consuming processes during hiring? iMocha's skills assessments reduce hiring time by 40%


JS Skills Required for Senior JavaScript Developers

Senior JavaScript developer skills differ from junior JavaScript developers. Here are a few must-have js developer skills for senior developers:

  • Advanced knowledge of HTML, CSS, and JavaScript
  • Expertise in JavaScript libraries and frameworks, including the ability to build custom solutions
  • Knowledge of advanced data structures and algorithms
  • Ability to design and implement complex software architecture
  • Ability to write code that is efficient, scalable, and maintainable
  • Expertise in web development tools and workflows, including continuous integration and deployment (CI/CD)
  • Strong problem-solving skills and ability to debug complex issues
  • Ability to mentor as well as lead a team of junior developers and guide them to success
  • Good grasp of design patterns as well as software engineering principles
  • Knowledge of front-end performance optimization techniques

JavaScript Developer Must-Have Skills

Must-have skills that JavaScript developers must possess are discussed below.

Must-Have JavaScript Skills

Characteristics + Benefits

1. Proficiency in core JavaScript

  • Should have a strong grasp of the language's core concepts, including variables, data types, operators, functions, control flow, and object-oriented programming

2. Knowledge of front-end development

  • Strong understanding of HTML, CSS, and the Document Object Model (DOM) helps create interactive and engaging user interfaces

3. Experience with popular front-end frameworks and libraries

  • Knowledge of React, Vue, and Angular helps build complex web applications more effectively

4. Familiarity with server-side programming

  • Knowledge of Node.js, Express.js, and database technologies helps create dynamic and scalable web applications

5. Knowledge of software development best practices

  • Should understand key best practices such as version control, testing, debugging, and code optimization

6. Problem-solving and critical thinking

  • Helps to be able to analyze complex problems and come up with innovative solutions

7. Communication and collaboration

  • Helps communicate effectively and work collaboratively with other developers, designers, and stakeholders


The takeaway: In addition to the skills mentioned above, high-quality JavaScript developers must also be able to continuously learn and stay up-to-date with the latest tools and technologies, participate in open-source projects, and build their own projects to showcase their skills.

To help hiring managers get started on the right note, use iMocha's AI-LogicBox to assess programmers on key skills such as SAP, Azure, AWS, and more.

JavaScript Developer Nice-to-Have Skills

There are several nice-to-have skills that contribute to being a versatile and effective JavaScript developer.

Nice-to-Have JavaScript Skills


1. Familiarity with a front-end framework

  • Must know at least one framework well (such as React, Angular, or Vue) to be able to develop complex front-end applications more efficiently

2. Experience with server-side JavaScript

  • Must know Node.js and server-side JavaScript to be able to:
  1. Write full-stack applications using a single language
  2. Create performant back-end for the web apps

3. Understanding of functional programming concepts

  • Understand functional programming concepts like immutability, pure functions, and higher-order functions to write more concise and maintainable code

4. Experience with testing frameworks

  • Familiarity with testing frameworks like Jest or Mocha can make code more reliable and help catch issues early in the development process

5. Knowledge of CSS and design principles

  • Knowing CSS and design principles can help make the applications look great and be more user-friendly

6. Familiarity with databases

  • Knowing SQL and database design concepts can help understand how to interact with web apps and help build full-stack applications easily

7. Experience with build tools and package managers

  • Build tools can help automate the build process, and package managers can help manage dependencies more efficiently


The takeaway: These skills are unnecessary for every JavaScript developer. However, having someone with these experiences can help recruiters hire more well-rounded developers and help the brand differentiate itself in a competitive market.


Candidates abandoning your recruiting process? iMocha keeps candidates engaged with fun and quick pre-employment assessments

Soft Skills Required for JavaScript Developers

When it comes to assessing JavaScript developer skills, recruiters must not forget about important soft skills, such as the following.

8. Communication: JavaScript developers need to communicate with other developers, project managers, and clients. Clear and effective communication is essential to make sure that everyone is on the same page and that the project is moving forward.

9. Problem-solving: JavaScript developers will encounter a variety of technical problems. This is why the ability to think critically and find creative solutions to these problems is essential.

10. Adaptability: JavaScript is a rapidly evolving language, and developers must be able to adapt to new frameworks, libraries, and coding practices.

11. Collaboration: Most JavaScript projects are team efforts, so the ability to collaborate and work effectively with others is crucial.

12. Time management: JavaScript developers often work on multiple projects simultaneously, so the ability to prioritize and manage your time effectively is paramount.

13. Attention to detail: Small mistakes in JavaScript code can have significant consequences, so it's important to pay attention to the details and avoid careless errors.

14. Continuous learning: The world of web development is constantly evolving, so developers must be able to stay up-to-date with the latest trends and technologies. They should always be looking for opportunities to learn and improve their skills.

By developing these soft skills, recruiters can hire successful JavaScript developers and boost organizational performance as well as productivity.

How to Assess JavaScript Developer Skills

iMocha is an online assessment platform that can be used to evaluate JavaScript developer skills. Below are some tips on how to use iMocha to assess JavaScript developer skills.

Tip #1: Select the Right JavaScript Test

iMocha has multiple tests for JavaScript, such as Basic, Advanced, and Full Stack. Recruiters can choose the test that is most relevant to the level of the developer they are assessing.

Tip #2: Determine the Test Duration and Type

Hiring managers can also choose the duration of the test, such as 30 minutes or 60 minutes, and the type of questions, such as multiple-choice or coding challenges.

You can also use iMocha's coding simulators to hire and upskill coders easily.

Tip #3: Customize the Test

Recruiters can customize the test by adding or removing questions, changing the difficulty level, and setting the passing score.

Tip #4: Test for Specific Skills

Hiring managers can use iMocha to test for specific skills such as JavaScript syntax, object-oriented programming, asynchronous programming, and more.

Tip #5: Monitor the Test

Recruiters can monitor the test in real time and see the progress of the test-taker.

Tip #6: Review the Test Results

Once the test is completed, iMocha will provide a comprehensive report on the test-taker's performance, including their score, time taken, and detailed analysis of their strengths and weaknesses.

Tip #7: Follow Up with a Technical Interview

To get a more accurate understanding of the test-taker's skills, follow up with a technical interview to discuss their performance on the test and their experience with JavaScript.

Overall, iMocha is an effective tool to assess a JavaScript developer's skills, as it provides a standardized and objective evaluation of their abilities.



To summarize, when hiring a JavaScript developer, there are several skills and attributes recruiters must look for.

These include proficiency in core JavaScript, familiarity with popular JavaScript frameworks and libraries, a solid understanding of web development technologies,  exceptional problem-solving skills, excellent communication skills, great attention to detail, and experience with testing and debugging.

By keeping these skills and attributes in mind, recruiters can find a JavaScript developer who will be able to contribute to the team and help build high-quality web applications, all at the same time.




1. What are the most in-demand JavaScript skills?

JavaScript is a programming language used popularly for web development. There are many JavaScript skills that are in high demand, such as the following:

  • Front-end frameworks: Knowledge of front-end frameworks like React, Angular, and Vue is essential for building modern, responsive web applications.
  • Server-side development: Knowledge of server-side frameworks like Node.js and Express is important for building server-side applications and APIs.
  • Asynchronous programming: Asynchronous programming is a core feature of JavaScript, and developers who are skilled at using promises, async/await, and other asynchronous patterns are in high demand.
  • Testing and debugging: Knowing how to write effective tests and debug complex issues is important for building high-quality applications.
  • Web performance optimization: Knowledge of techniques for optimizing web performance, such as lazy loading, code splitting, and caching, is becoming increasingly important.
  • Mobile development: With the rise of mobile devices, knowledge of mobile development using technologies like React Native or Ionic is becoming more important.
  • Progressive Web Apps (PWAs): PWAs are web applications that offer a native-like experience to users. Knowledge of PWA technologies like service workers and Web App Manifests is becoming increasingly important.

All in all, the demand for JavaScript skills will continue to grow as web, and mobile applications become more important and complex.


2. How much does it cost to hire JavaScript developers?

The cost of hiring a JavaScript developer can vary depending on factors like the developer's experience, skill level, location, and the nature of the project. Here's a general cost to hire JavaScript developers:

  • Entry-level developers: Entry-level JavaScript developers typically have limited experience and may require some on-the-job training. Their hourly rate can range from $15 to $40 per hour, with an average of around $25 per hour.
  • Mid-level developers: Mid-level developers have several years of experience and have honed their skills in one or more JavaScript frameworks or libraries. Their hourly rate can range from $40 to $100 per hour, with an average of around $60 per hour.
  • Senior developers: Senior developers have extensive experience and are highly skilled in JavaScript, with a deep understanding of multiple frameworks and libraries. Their hourly rate can range from $100 to $200 per hour or more, with an average of around $150 per hour.

3. How long does it take to hire JavaScript developers?

The time it takes to hire JavaScript developers can vary based on different factors, including the complexity of the job requirements, the availability of qualified candidates, and the hiring process of the organization.

Based on these factors, it can take anywhere between a few weeks to several months to hire a JavaScript developer. This is why organizations must consider expanding their search criteria, working with recruiting agencies, or offering competitive compensation and benefits to attract top talent in a timely manner.

Gemma Benny
Gemma Benny
I am a Content Writer at iMocha. A B2B writer that creates articles and listicles while trying to build a relationship with potential clients and also adding value to the content wherever possible. I have previously worked with clients in the medical, fashion, education, IT, and beauty domains. Before joining as a full-time writer, I worked as a digital marketer for over two years. When I am not keeping busy with content writing, you can find me baking, exploring the culinary world, and playing badminton.
Find me on:

Related Posts

Top 15 Staffing Management Tools to Consider in 2024

Finding and retaining top talent is crucial for business success, yet it's a challenging task that requires strategic planning, efficient processes, and the right tools. Staffing management encompasses various activities throughout the employee lifecycle, from identifying workforce needs to onboarding new hires and ensuring their success.

Top 15 Talent Evaluation Tools

When it comes to talent, making the right hiring decisions is critical for businesses to build high-performing teams. With manual resume screening emphasizing education or work experience and cultural fit contributing to a lack of diversity, traditional hiring methods often fail to provide a complete and unbiased picture of candidates. Here’s where Talent Evaluation tools come into play.

Top 5 Talent Planning Software (2024)

Talent planning is essential for an organization's 'Skills-first' journey. It serves as a strategic priority for HR teams, allowing them to optimize employee performance and development, identify skills gaps, and improve mobility for open job roles and requisitions.