Top Interview Questions & Salary Trends for Javascript Developers in 2023

When it comes to programming languages, Javascript is one that is integral to modern web development. So, it’s no surprise that many companies seek to hire Javascript developers to join their teams. And whether you are a senior Javascript developer or someone who is just starting out, it is imperative that you are prepared for the interview process and that you have a clear understanding of the salary you can expect for this role. In this article, we’ll explore just that! Below, you will find common interview questions that you may run into as a Javascript developer, a list of skills employers are seeking, and insights into the current salary trends for folks in this field. By the time you’re done reading, you will have gained a better understanding of what to expect during the hiring process and how to navigate salary offers once you ace your interviews. Keep scrolling!

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Published inCareer Development
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In this article:

  1. Frequently Asked Interview Questions for Javascript Developers
  2. Skills Employers Want in a Javascript Developer
  3. Current Salary Trends for Javascript Developers in 2023

Frequently Asked Interview Questions for Javascript Developers

  1. Can you explain the differences between var, let, and const keywords in Javascript? Please provide examples
  2. What is the difference between undefined and null in Javascript? What is the process for checking these values?
  3. Can you explain what an event loop is? What is its significance?
  4. Name some common design patterns in Javascript and explain how they could be used.
  5. Do you know the difference between asynchronous and synchronous code execution? Can you provide an example of each?
  6. How do you use closures in Javascript?
  7. Explain how you would handle asynchronous code in Javascript. Provide an example of how to use async/await.
  8. What is a promise in Javascript?
  9. Can you explain what a callback is?
  10. Can you list some of the new features in the latest version of Javascript? Are you comfortable using any of these new features?
  11. Explain the difference between Typescript and Javascript. What factors would determine which one to use for a project?
  12. Provide an example of a performance issue one might experience while working in Javascript and how they could work to resolve it.
  13. What is the difference between the document object model (DOM) and the virtual DOM in Javascript frameworks? Please provide an example of a framework that uses the document object model. 
  14. What is your experience handling errors in a Javascript application?
  15. Explain your workflow and how you would approach optimizing a Javascript application. 

“You shoud imagine variables as tentacles, rather than boxes. They do not contain values; they grasp them – two variables can refer to the same value.”

– Marijn Haverbeke, author of Eloquent Javascript: A Modern Introduction to Programming 

Skills Employers Want in a Javascript Developer

When hiring Javascript developers, employers seek candidates with a variety of skills. After all, Javascript is a core programming language and many applications are built using it. So, it’s imperative that candidates have the skills needed to tackle tough Javascript jobs.

Some of those skills can include the following:

  • In-depth understanding of Javascript concepts including variables, functions, loops, objects, and control structures. 
  • Knowledge of asynchronous programming concepts such as callback and promises
  • Proficient knowledge of HTML, CSS, and other front-end development technologies
  • Knowledge of cross-browser compatibility issues and how to resolve them
  • Up-to-date front-end performance optimization strategies and techniques
  • Ability to solve complex problems and think of innovative solutions
  • Superb communication skills and ability to work well with others in a team environment
  • Troubleshooting skills and ability to debug applications
  • Proficient knowledge of server-side programming languages like Python, Ruby, and Node.js
  • In-depth knowledge of data structures and algorithms
  • Experience working with Javascript frameworks like React, Vue.js, and jQuery

“Truth can only be found in one place: the code.”

– Robert C. Martin, American Software Engineer

We know what you’re wondering…how much does the average Javascript developer make in the US these days? Well, like most tech industry jobs, that will vary depending on a few key factors. However, according to PayScale, the average salary for Javascript developers is around $89,000 per year

Other resources such as report an average salary of more than $108,000 and a salary range of $98,000 to $120,000 depending on the years of experience, skills, education, and other qualifications a candidate has. 

female javascript developer walking up concrete stairs while wearing a black business suit

Three additional factors that may influence salary trends include:

  • Company Size
    • Big companies tend to have more flexible budgets when it comes to hiring developers. So, a large corporation may be able to offer a more competitive salary than a startup, for instance. However, don’t let that deter you from applying to small organizations. After all, budgets vary from business to business and they just may be able to meet your salary expectations. 
  • Artificial Intelligence
    • Across industries, we are seeking an increased demand for developers who are familiar with the advanced technologies that are emerging every day, including blockchain, machine learning, and AI
  • Remote Work
    • Virtual or remote work is still on the rise. As a result, salary trends for tech jobs may be impacted. In a nutshell, this means that web development professionals who don’t mind working remotely may find opportunities that offer competitive salaries and employee perks. 

It is also worth noting that salary information will vary depending on the resource being cited. Even in the info provided above, you’ll notice different numbers being reported across sites. So, it’s imperative that you do your due diligence when it comes to figuring out salary expectations. Look up a variety of resources, review your work experience, and keep external factors in mind.