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JavaScript is a language created by Brendan Eich for use on the web. Along with WebAssembly, it is one of the two primary ways to add advanced functionality to websites.
Nowadays, it is used almost everywhere — from servers using Node.js to mobile apps using React Native.
According to the Stack Overflow 2022 Developer Survey, JavaScript is the most popular language among developers, with over 65% of people reporting they had used it.
One reason JavaScript is so popular is that it offers many features to reduce the learning curve and make programming easier, such as:
Automatic garbage collection
Support for multiple programming paradigms
Another, arguably even more significant reason for JavaScript’s popularity is its universality.
While JavaScript started as just a language for the web, the presence of cross-platform JavaScript engines like Google’s V8 helped build an entire ecosystem around it — powering desktop apps, mobile apps, servers, IoT devices, and even game plugins like those for Minecraft.
To find the right JavaScript developer, you first need to consider what your codebase is using.
Knowing JavaScript is essential, but in most cases, you will need more beyond that.
For example, if you are using TypeScript, it would be helpful for the developer you are hiring to have experience with TypeScript or at least some background with type-safe languages.
Additionally, the required skills can vary depending on the targeted platform and the rest of the stack:
If you're building a server program, Node.js experience is a major plus.
If you're building a front-end web app, knowledge of frameworks like React or Vue may be more beneficial.
JavaScript Developer Experience Levels:
Entry-level JavaScript Developer
May know how to use JavaScript syntax well but could require guidance when integrating JavaScript into the broader application stack.
They may struggle with advanced object-oriented programming patterns and optimization.Intermediate JavaScript Developer
Should have solid experience with the stack, capable of implementing advanced algorithms, and writing clean, adaptable code.
They should confidently develop larger sections of functionality, such as full pages or microservices, but performance-critical elements might still be better handled by senior developers.Senior JavaScript Developer
Should be able to write highly optimized, abstract algorithms and have deep knowledge of almost all parts of the stack.
They should also be able to quickly learn new parts of the stack, have experience building production-grade applications, and guide major technical and architectural decisions.
Example Hiring Process for a JavaScript Developer:
Review Application and Resume
Assess if the candidate meets the basic requirements for the role.Initial Interview (Phone or Video)
Discuss the candidate’s background, experience, and interests. Provide an overview of the company and the role.Technical Assessment
Conduct a coding challenge or technical interview to evaluate technical skills and knowledge.Team Interview
Host a face-to-face or video interview with the team and potential manager to assess team fit and deeper technical compatibility.Reference Checks
Verify the candidate’s experience and qualifications through their references.Final Decision and Offer
Make an offer to the candidate who best fits the position and the team.
The specific steps in the hiring process may vary depending on the company and the role, but the goal should always be to assess the candidate’s technical skills, experience, and fit for the team.
As a JavaScript developer at [COMPANY], you will utilize JavaScript to build [TYPE OF APPLICATION] using [FRAMEWORK/Runtime].
Your responsibilities will include:
Responsibilities:
[If backend] Develop high-quality server programs using Node.js
[If frontend] Work with product and design teams to create new functionality in JavaScript [Add framework if necessary]
Participate in code reviews and provide constructive feedback to team members
Help identify and troubleshoot technical issues, collaborating with the team to resolve them
Continuously improve technical skills and stay updated with the latest developments in JavaScript
Requirements:
Strong experience with JavaScript [Add TypeScript if using it]
Knowledge of modern software development practices, including agile methodologies and continuous integration
Strong problem-solving skills and the ability to work independently and in a team
Excellent communication skills and the ability to collaborate well with others
[If backend] Experience with Node.js or other JavaScript server runtimes such as Deno
[If frontend] Experience integrating JavaScript with HTML and/or frontend frameworks like React
Here are a few interview questions to help assess skill with JavaScript.
(Note: you should add additional questions tailored to the specific tools used for the job.)
Question 1: How would you implement FizzBuzz for numbers 1–100?
This is one of the most popular programming interview questions.
While basic, it tests the interviewee’s ability to translate verbal instructions into code that a computer can understand.
Note: Any correct solution that produces the expected output without hardcoding values is valid.
Question 2: How do you yield for promises using standard promise syntax? How would you do the same with async/await?
This question covers JavaScript promises, a core intermediate skill.
View example for both standard Promise syntax and async/await
Note: The example uses a placeholder name like ExamplePromise, but the actual variable name isn't important.
Question 3: Create a class called "Person" that takes two parameters — name and location — and sets them as properties.
This tests basic understanding of JavaScript classes.
Small variations to make the code more concise are acceptable.
Question 4: How would you make the above class’s properties accessible only inside the class?
This question digs deeper into classes and requires use of private class fields.
Note: Properties marked with a hashtag # are private and can only be read or written within the class itself.
Question 5: What is the difference between an Int8Array and an ArrayBuffer?
This is a more advanced question.
A strong answer would sound like:
“An ArrayBuffer is a generic, fixed-length buffer for binary data, while an Int8Array is a typed array view that allows you to read and manipulate the contents of an ArrayBuffer assuming they are 8-bit signed integers.”
This question also tests the interviewee’s communication clarity and technical depth.
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