The Vital Guide to JavaScript Interviewing

As with any technology, there’s knowing JavaScript and then there’s really knowing JavaScript. Here are proven, effective techniques and questions for finding true masters of the language.

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Read a list of great community-driven JavaScript interview questions.

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Charles Cook, Ph.D.United States
Charles has a Ph.D. in aerospace engineering and spent three years developing custom data processing and analysis programs for NASA. He specializes in scalable, enterprise-level application development and engineering solutions for exceptionally high throughputs. He is also the founder and owner of GreatVocab.com, for which he developed the core system using novel concepts in data analysis and control theory.
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Zoran MelisCroatia
Zoran is a software engineer with over ten years of professional experience with a wide range of technologies. He has worked with C/C++, Python, Go, JavaScript, Java, and more. Currently focusing on full-stack, scalable applications development, he has been a part of teams of all sizes in environments ranging from small private companies to Google.
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Alejandro HernandezArgentina
Alejandro got his Bachelor's in software engineering eleven years ago, and since then has been working for software companies of all sizes from all around the globe as a freelancer. Currently, he enjoys working as the technical lead on JavaScript projects, where his deep understanding of architecture and theory is most impactful.
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Rafael ChitiUnited Kingdom
Rafael is passionate about change and trying new things, both professionally and in general with his life. He is a skilled web developer with over 8 years of experience. He loves startups and is extremely proactive.
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Ignacio FreibergArgentina
Ignacio is a software engineer and architect with more than 8 years of experience in many programming languages, libraries, and frameworks. He enjoys working in freelance mode to give him the opportunity to constantly develop new skills, and he is familiar with many different paradigms and technologies.
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Alexander V. MakeevRussia
Alexander carries multiple technical degrees in Nuclear Physics and worked at CERN as a Python developer implementing dynamic performance optimizations for complex web applications. He excels at rapidly integrating reliable web technologies and achieving flexible software architecture designs. His strong theoretical and practical background in IT, business consulting, and project management makes him extremely capable on projects of any size.
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Konstantin KanishchevFrance
Konstantin is a Theoretical Physicist with a strong background in C++, Python, and JavaScript programming. With deep experience in research-level software development, heavy data analysis (WLCG), and data visualization (d3.js), he provides high-level expertise in Physics, CS, and Applied Mathematics.
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Rafal GwizdalaPoland
Rafal is a skilled software engineer with strong architecture and coding skills, broad technology knowledge, and many years of experience delivering software. He is a project leader, mentor, coder, and consultant. He specializes in business software, process automation, and transactional systems.
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Mark Wong-VanHarenSpain
Mark is an entrepreneur, engineer, CTO, and artisan with decades of startup experience, including co-founding Excite.com. He makes complex problems simple with expressive, maintainable code. He believes in building small, well-tested, functional pieces, loosely joined by a well-documented contract.
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Tomislav CapanCroatia
Tomislav is a software engineer, technical consultant, and architect with over 10 years of experience. He specializes in full-stack, highly scalable, real-time JavaScript and Node.js applications, with past experience in C#, Java, and Ruby. He is an agile Kanban practitioner who loves to collaborate on development projects.
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A JavaScript developer is responsible for implementing the front-end logic that defines the behavior of the visual elements of a web application. A JavaScript developer is also responsible for connecting this with the services that reside on the back-end. They are usually supported by back-end web developers, who are responsible for server-side application logic. JavaScript developers often work alongside other front-end web developers who specialize in markup and styling.

Even though a JavaScript developer typically works on the front-end, the programming language itself is not limited to front-end use only. In case you are looking for a back-end JavaScript developer, please refer to our Node.js Developer Job Description Template.

Writing a good job description and a corresponding job advertisement requires proper specification of your concerns. Posting a generic web developer job description when you are looking for an advanced JavaScript web developer will bring numerous applications from people who are specialized in building back-end web services, or web designers who have little to no knowledge about JavaScript.

There are some technologies and knowledge that are common to all web developer jobs. This article will provide you with a sample JavaScript developer job description that will help you write a perfect job ad and assure that you easily find and hire the person that matches your specific criteria.

JavaScript Developer - Job Description and Ad Template

Company Introduction

{{Write a short and catchy paragraph about your company. Make sure to provide information about the company’s culture, perks, and benefits. Mention office hours, remote working possibilities, and everything else you think makes your company interesting.}}

Job Description

We are looking for a JavaScript Developer who is motivated to combine the art of design with the art of programming. Responsibilities will include implementing visual elements and their behaviors with user interactions. You will work with both front-end and back-end web developers to build all client-side logic. You will also be bridging the gap between the visual elements and the server-side infrastructure, taking an active role on both sides, and defining how the application looks and functions.

Responsibilities

  • Develop new user-facing features
  • Build reusable code and libraries for future use
  • Ensure the technical feasibility of UI/UX designs
  • Optimize applications for maximum speed and scalability
  • Assure that all user input is validated before submitting to back-end services
  • Collaborate with other team members and stakeholders
  • {{Add other responsibilities here that are relevant}}

Skills and Qualifications

  • Strong understanding of JavaScript, its quirks, and workarounds
  • Basic understanding of web markup, including HTML5 and CSS3
  • Good understanding of {{Depending on the specific case, a developer should have the knowledge of advanced JavaScript libraries and frameworks such as AngularJS, KnockoutJS, BackboneJS, ReactJS, DurandalJS etc.}}
  • Good understanding of asynchronous request handling, partial page updates, and AJAX
  • Proficient understanding of cross-browser compatibility issues and ways to work around such issues
  • Familiarity with JavaScript module loaders, such as Require.js and AMD
  • Familiarity with front-end build tools, such as Grunt and Gulp.js
  • Proficient understanding of code versioning tools, such as {{Git / Mercurial / SVN}}
  • Good understanding of browser rendering behavior and performance
  • {{Make sure to mention any framework, library, or any other technology related to your development stack}}
  • {{List education level or certification you require}}
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