How to Craft Thorough Front-End Developer Interview Questions

By gswardman March 15, 2022

Are you looking for the ideal web design professional? Choosing the right candidate can be a daunting task, especially because the market is filled with IT professionals. While conducting interviews can help you hire skilled talent, you must ask the right questions to get the best candidate for your needs.

Besides understanding the task at hand, crafting compelling front-end developer interview questions requires you to be tactful and analytical. You should tailor questions to display a developer’s soft and technical skills. Here is a guide to help you create suitable front-end interview questions for different skill levels.

Front-End Developer Interview

What does a Front-End Developer Do?

Front-end web application developers implement the visual components that website users view and interact with. They work hand in hand with backend developers. A front-end developer leverages web languages and open source libraries like CSS float, doctype HTML, angular, and JavaScript templates to build applications and websites.

Worth mentioning is that the skills and responsibilities of a front-end developer move hand in hand. Front-end developers use a combination of programming, technology, and design to design a site’s appearance. They also focus on debugging. Here are some of the common roles of front-end developers.

  • Leveraging JavaScript, HTML, and CSS to actualize concepts
  • Optimizing user experiences
  • Building and sustaining the user interface
  • Adhering to SEO best practices
  • Developing tools that enhance website interaction for different web browsers
  • Enforcing design on mobile websites
  • Debugging and testing sites for usability
  • Regulating software workflow

How do Developers Use Various Programming languages?

Front-End Developer Languages

Front-end developers leverage HTML to outline a document’s content and overall structure, JavaScript for conditions that need progressive interactivity, and CSS selector for styling. They can also use AJAX (a blend of XML and JavaScript) to update various site sections without refreshing the whole page. Developers use other languages like PHP, Ruby, and Python to easily link data with their website’s backend.

· Frameworks and Libraries

Front-end developers often use design frameworks such as Bootstrap and Foundation and libraries developed on programming languages like React, jQuery, and AngularJS. CSS extensions like SASS offer enhanced power and modularity.

· CSS Preprocessors

Many front-end developers leverage CSS preprocessors to make CSS coding more functional, scalable, and easy to engage with. Before publishing code on a website, CSS preprocessors convert it into well-structured CSS that operates across different browsers, with SASS and LESS being the most popular.

· Additional Skills for Front End Web Development

Front-end developers focus more on coding and designing a website’s feel and appearance. Here are common skills used in the front-end development world.

· RESTful Services and APIs

Front-end developers leverage and interact with RESTful services and APIs. Representative State Transfer (REST) is a lightweight structure that facilitates network communications, and RESTful services and APIs follow that structure.

Why Should You Write a Good Job Description for A Front-End Developer Role?

A good front-end web developer job description can improve an organization’s employee management capability in various ways, as we shall see below.

· Outlining Expectations

Employers should clarify their expectations on the tasks a web developer should be executing every day. Describing your tasks ensures that employees and employers work harmoniously while preventing misunderstandings.

· Helps Employers Pinpoint Training Requirements and Skill Sets

The ideal web developer job description helps employers determine skill sets to understand which candidates require specific training to improve their expertise. It can also facilitate success in career advancement and planning for employees.

· Provides a Structure

A good web developer provides the structure and discipline needed to execute all allocated responsibilities and duties.

Entry-Level Front-End Developer Interview Questions

Entry-Level Front-End Developer Interview Questions

Interviewing for an entry-level front-end web developer job can be intense. As a result, being conversant with web basics comes in handy. Here is a list of some frequently asked technical questions and answers under this section.

· What is Coffee Script?

It’s a small programming language that changes to JavaScript. The coffee-script is designed to illustrate the power of JavaScript clearly. It also enables developers to write JavaScript code easily by offering consistent syntax while evading the JavaScript language’s oddity.

Which Non-Technical and Technical skills do you need to become a Front-End Web Developer?

  • HTML
  • JQuery
  • CSS
  • JavaScript
  • Experience in CMS (content management systems) like Joomla, Drupal, and WordPress
  • PHP and OOPs
  • Cross-browser research skills

Basic understanding of SEO and technologies required to ensure end-users get easy access to web-based content like Flash and Dreamweaver

· What does Scope Mean in JavaScript?

Every component in JavaScript comes with different scope. The scope is a collection of rules which determine the accessibility or visibility of variables. There are three types of scope: block, global, and function.

· Explain the Cross-Origin Resource Sharing) Cors Process

CORS is a strategy that allows users to request services like JavaScript, animations, and fonts on a web page from a different domain. It is an HTML5 mechanism that regulates XML Http Request access to a specific area.

CORS illustrates new HTTP headers that give authorized origin domains access. This specification demands that browsers use an HTTP Options CSS request header to request a list of available and acceptable strategies from the server for HTTP approaches apart from GET.

· How can you Free a Floated Element?

To remove a floated component from the document flow, you can use clear, try overflow, or both. Use auto on the containing div.

· Explain A Callback Function

JavaScript is translated line by line and results in what appears like a line of code being applied before a previous one. To avoid such a scenario, a callback feature will be used. The part will only be called after the last line of code has been entirely completed.

· Explain an IIFE

Explain an IIFE

IIFE (Immediately-Invoked Function Expression) executes after its generated through affixing a () to the likely function.

Junior Front End Developer Interview Questions

Junior front-end development is among the most popular careers in the tech industry, according to Stackoverflow research. Here are some of the interview questions in various topics you can expect if you seek employment in this sector.


  • What is the meaning of display style: inline-block in the CSS styling?
  • When should you utilize floats in CSS styling, and how do they function?
  • What do you know about a DOM?
  • What is SASS and the benefits of using it?
  • Explain the idea of responsive design, how it operates, and give examples
  • When should you utilize clear: both?


  • Explain JQuery and its functions
  • How do you send convert/out requests to JSON format?
  • What is an API request?
  • What is the difference between === and == in JavaScript?
  • Explain an async response
  • What is the meaning of JSON, and where is it used?
  • Explain the difference between the POST and GET when explaining an AJAX request


  • Which software or git versioning system are you conversant with? Illustrate how a workflow would appear like in such a system
  • Have you used Photoshop during your previous front-end development assignments? Explain its purpose

About You

  • What has been your most challenging project so far, and why? Was it an algorithm or application? If it was, how does it work?
  • Are there frameworks or languages you would want to learn in future
  • Are you working on any side projects? If you are, what are they?
  • How do you remain updated with the latest technology news?
  • What are the most crucial qualities and skills of a junior front-end developer?

Senior Front-End Developer Interview Questions

Senior ios developer interview questions depend on the person interviewing you and the organization you are applying for. However, here are some general questions that you are likely to encounter regardless of the organization or your interviewer.

· Explain Your Principles on Reusable Elements Vs. Premature Optimization and Simplicity

Often, this question is more subjective than other senior developer questions. Often, employers look forward to creating small stylesheets and reusable components without getting carried away. In this case, readability and simplicity are critical. You do not have to overcomplicate components. Make applications reusable when the need arises but always consider reusability when developing them.

· What Strategy can you use to Regulate the Number of API calls made from Your Hooks?

Use a package or caching CDN system. You can allocate something instate that determines whether the call is the same as the previous one. You can also utilize a package such as React node.js Query to help execute the caching on your behalf.

· Explain the Difference between Virtual Dom and Shadow Dom

Shadow DOM is a sub-tree or small illustration of the DOM, while Virtual DOM illustrates the entire DOM. Shadow DOM is a predetermined tree that only affects the component linked to it. As a result, animation and styling on scoped is easy. The core difference, in this case, is that the shadow DOM is made for a specific component while the virtual DOM is made for the entire DOM.

Other senior developer interview questions include:

  • How do you accelerate a single-page app?
  • Explain the difference between local storage, session storage, and cookies
  • Have you engaged in employee management tasks before?
  • What are your technical strengths?
  • How do you insert a string in an HTML component?
  • Explain the difference between content and border-box model
  • How do I prepare for a Front-End Developer Job Interview

Many job seekers struggle with interviews. Apart from the pressure of securing the job, you must answer different questions during and sometimes before the interview. Here are tips to help you prepare for a front-end development interview.

Create an Online Coding Profile

Improve coding skills

Based on the company you are interviewing for, you will be asked to demonstrate your coding skills. Having a coding profile, in this case, comes in handy. Have a blog website to document the various tech processes you are conversant with. A Github account is ideal if you want to upload your sample projects. You can also have a youtube channel where you create tutorials and share them with your followers.

· Outline Your Expectations

Before submitting your application read the vacancy advertisement carefully to determine whether it caters to your requirements. Some of the elements to clarify before include:

  • Details of the vacant position
  • Location
  • Size of the organization
  • Technology, the potential employer, uses
  • Projects the organization is working on
  • The organization’s preferred experience level

Ask Your Friends for Assistance

Friends can be instrumental in your job search journey. If any of your friends are already working in a tech organization, request them to notify you whenever a suitable position falls vacant in the firm. Friends can also educate you about the company to help you decide whether it meets your expectations or not.

· Relax


Getting nervous before an interview is a common feeling among many job seekers. However, remaining calm will make you more self-confident and professional. Here are some tips to help you feel relaxed before an interview.

  • Research extensively about the organization and the advertised position
  • Remain positive and focus on your robust skills
  • Arrive for the interview early enough so that you can settle down before the interviewer invites you.
  • Understand even if things don’t go according to your expectations, there are numerous opportunities available in the market.
  • Approach the interview as a normal conversation

Answer or Ask Questions Honestly

Honesty is crucial. Tell your potential employer about yourself, your knowledge, skills, experience, and expectations for the job should you get it. Remember to ask as many questions as you can.

Doing so tells the interviewer that you are interested in the vacant position. Remember, you spend a big percentage of your time at work, and you don’t want to work somewhere you are not passionate about.

Exercise Caution when Talking About Your Previous Employer

Often, the interviewer will want to know why you are changing jobs. Provide your reasons but remember to maintain respectful and professional boundaries. Regardless of your reasons, don’t let your potential employer think you complain. Doing so makes them feel like you will transfer the same behavior to their organization.

Know the Market Salary Range for the Position

Salary Pay Structure

Many interviewers will want to know about your salary expectations. Conduct research to understand the market rates within your region to understand how to answer that question. Don’t address money matters unless the interviewer asks.


Are you looking for the ideal front-end developer job? Use the tips in this article to increase your chances of getting hired. Remember, securing a job is not easy, but you can impress the interviewer and get hired by researching widely, remaining calm, and improving your coding skills through practice.

Are you an employer looking for the right talent for your project? Crafting the right job description helps you attract the best candidate in the market. This article should help you understand some commonly asked interview questions for front-end developers of varying experience levels. A good job description will help you hire a Saas developer that meets your organization’s needs.