Friday, May 24, 2024

How To Prepare For A Front End Developer Interview

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What Is The Difference Between Unit Tests And End

Frontend Interview Questions 2021 | Front End Developer Interview Questions And Answers |Simplilearn

There is a ton of overlap but at a high-level unit tests mean testing your actual code. Making sure that functions return expected results when given specific inputs. End-to-end tests are intended to test the website itself, not the code. They simulate clicks and scrolls and make sure the site behaves accordingly.

Have You Encountered Browser

This is one of the most asked frontend developer interview questions. It is common for frontend developers to introduce browser-specific hacks because each application handles rendering differently. As such, developers should be familiar with troubleshooting browser-specific rendering problems.

Sample answer: For me, I encounter rendering problems usually with Microsoft Edge. Hence, I typically change DIV positions with the browser. On the other hand, I dont usually have issues with Chrome and Firefox.

What Types Of Front End Development Projects Do You Prefer And Why

The aim of this question is to assess the candidate’s personal preferences to determine if they suit your needs. What to look for in an answer:

  • Passion for their work
  • Experience in a similar role
  • Able to adapt to different types of projects


“My favourite type of front end development project is developing websites for nonprofits. Nonprofit organizations already do so much to help our community that I enjoy being able to help them.”

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Do Some Research On The Company

In interviews, the candidates will be asked both technical and non-technical questions. The purpose of non-technical questions is for the interviewers to know whether you are a responsible person and will achieve their organisations expectations.

Questions like:

  • Why are you interested in working for us?
  • What are the objectives of our company?
  • Name our CEO.

Some questions will be asked to assess whether you are an attentive and responsible person. So, you should research the company before attending the interview.

Can You Explain What User

How to Prepare for a Front End Developer Interview

The aim of this question is to assess the candidate’s technical knowledge. What to look for in an answer:

  • Understanding of user-centred design
  • Ability to name the benefits of user-centred design
  • Willingness to implement user-centred design in their work


“User-centred design is a process that web developers use to focus on the client’s needs, requirements, and customer base. Through every aspect of the design process, the front end developer will focus on what the user of that website needs. User-centred design requires a lot of research to work but is very beneficial. It often creates a more successful website with more organic traffic as the developer makes it with the user in mind.”

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Why Did We Utilize The Data

Generally, Data-* attributes of HTML are utilized to accumulate the custom data, which is private to the web application or page. This custom data is for personalizing the JavaScript of the user as per the user action on the web page.

These days, Data-*attributes are not advised to utilize as the user can change the attribute easily just by utilizing the browser inspect console.


How Do You Stay Up

The aim of this question is to determine whether the candidate has current knowledge of the industry. What to look for in an answer:

  • Understanding of current industry news and trends
  • Passion for their work
  • Willingness to update their knowledge consistently


“I keep updated with industry trends, news, and techniques by reading industry magazines. Some of my favourite web design magazines are Creative Bloq and Smashing Magazine. I also enjoy web development magazines, such as Noupe Magazine and Sprye Studios. I read an article or two a day with my breakfast to stay up-to-date.”

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Preparing For Your Front End Developer Interview

Before going through the possible front end interview questions, it is important to keep the following points in mind before your interview:

  • Have a firm grasp of web fundamentals such as build systems, CSS layout engines and web performance.

  • Build sample websites and apps to show during your interview.

  • Have your portfolio and website ready to be browsed through by the employer.

  • Build a strong professional presence on social media.

  • Ask the person who set up the interview about the format of the interview as some interviewers may ask you to use an online text editor or a whiteboard.

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What Is A State In React How Do You Implement It

Interview with a Front-End Developer

A state is an object that stores the values of properties belonging to a component that could change over a period of time.

Here are a few features of a State –

  • You can change a state as a result of a user’s action or changes in the network.
  • React re-renders the component to the browser whenever the state of an object changes.
  • You initialize the state object in the constructor.
  • It can store multiple properties in the state object.
  • this.setState is used to alter the state object’s value.
  • The setState function merges the new and old state and the previous state in a shallow merge.

Free Course: Programming Fundamentals

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How To Run Front

Interviewing developers is hard.

Even if youve been doing it for 14 years, youre spending a lot of time and energy to ensure you find the right candidate AND show the candidate why they should want to work for you.

And, of course, theres always the risk that you spend all that effort on the wrong candidate. The one who lied about their coding skills, doesnt work well on a team, or simply doesnt know how to communicate.

Many factors go into creating a good interview the size of your company, the type of role youre interviewing for, and candidate experience level are but a few.

One process consideration is the number and type of interviews and assessments youll use. Are you a big company with lots of applicants? You may want to use a screening tool like CodinGame. Are you interviewing for more senior roles? You may want to skip straight to a live interview coding session with CoderPad.

Front-end engineers dont just need to know how to code navigation menus and drop-downs. They need to understand design basics, how to interact with the back end, and how to turn design requirements into a functioning user interface.

Well show you how to create suitable front-end interviewing questions, how to structure your interviews, how to assess a candidate during the interview, and how to get excellent candidate feedback.

In Your Opinion What Are The Differences Between Front

More than to test your knowledge of UI/UX designers, this question is a way for the employer to better evaluate your experience as a front-end developer. There’s no one answer to this question except that UI/UX design verges more on the human side of the design process. This question is an opportunity for you to draw on past experience and to show your employer where you want your coding skills to take you in your future role.

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How Can You Traverse The Dom With Javascript

You can grab a DOM node with either `getElementById` or `querySelector`. You can then get all of its children by calling `.childNodes` . You can then traverse the DOM by iterating through the childNodes and calling `.childNodes` on each one of them. You can walk your way back up by checking any node’s `parentNode`.

For more information, check out all of the properties stored on DOM nodes.

Describe The Way How Make A Code That Is Understandable To Your Colleagues As Well

Essential Skills to become a Front End web developer

One of the plus points of a good developer is to write user-friendly code. And a good code should be easy to readable and understandable for other developers and peers.

To meet this requirement a good developer always makes proper usage of comments. Comments are statements that are not machine-readable which means we only add comments for colleagues and peers to understand the specific line of codes for later usage.

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Explain What Are The Difference Between A Get And Post Request

Both a GET and POST method are used to transfer data from client to server in the HTTP protocol. The main difference between the POST and GET method is that GET carries request parameters appended in the URL string while a POST carries request parameter in the message body which makes it a more secure way of transferring data from client to server in HTTP.

What Is Svg In Html

< svg width=”100″ height=”100″>

< circle cx=”50″ cy=”50″ r=”40″ stroke=”yellow” stroke-width=”4″ fill=”red” />

< /svg>

  • HTML SVG is a markup language that describes vector and raster graphics. XML text files define SVG pictures and associated behaviors.
  • It’s typically used for X, Y coordinate system diagrams like pie charts and 2-Dimensional graphs.

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Front End Developer Interview Questions And Answers

Why would you need to know all the most common front-end developer interview questions and answer?

In todays technology world, a front-end developer should be tech-savvy and proficient to translate client needs into creative and interactive web applications and mobile apps where developers need specific skills for the latter. Gaining these skills requires front-end development training. Today, many top companies are looking to hire for front-end developer positions so that these developers can help them build elegant, intuitive, responsive and interactive user interfaces that work well on various devices. But the problem is that most candidates get confused or are not sure what type of interview questions they have to prepare for a front-end development interview which will eventually help them get hired.

It is quite simple to discover various practice questions, but it is hard to choose the right ones amongst these options.

Knowing the right questions is crucial for anyone that wants to ace a front-end developer job interview.

Whether you are a beginner or an experienced candidate, check out the list of top front-end developer interview questions and answers below. This article will help you to get to know both the questions and be prepared, so you will succeed in your interview.

What Do You Think A Front End Developer’s Role Is In A Team

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The aim of this question is to assess the candidate’s understanding of the role and ability to work well as a team. What to look for in an answer:

  • Understanding of the role
  • Willingness to work as a team
  • Strong industry knowledge


“Front end developers work closely with back end developers to create a visually appealing, cohesive website. They ensure a website looks good but also functions properly by utilizing their team’s code. Front end developers should have an in-depth understanding of coding languages and design aspects to create a well-balanced website.”

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Types Of Questions Youll Encounter

At a minimum, you will be asked about basic to advanced techniques involving HTML, CSS, DOM, JavaScript, HTTP/URL, and browser skills.

Beyond concrete examples of your skills, most hiring managers will be concerned about how well you will fit in with the company. Below are some broad categories that these questions fall into.

What Is Frontend Development

Before we get into the frontend developer interview questions, lets get to know the nature of frontend development.

Frontend development encompasses the activities and practices of converting data, through code, into a graphical interface wherein users can interact with website data. This is possible with the use of HTML, CSS, and JavaScript. With this definition, we would be able to detail the frontend developers job description.

A frontend developer develops effective user interfaces on websites and applications using frontend development tools and platforms as required per project. A candidate for this position will work closely with the project manager, software designers, and fellow developers to achieve the goals and objectives of the project.

Frontend developers perform the following responsibilities:

  • Develop effective and innovative user interfaces
  • Implement responsive web design principles and resolutions to maximize use among different devices
  • Develop libraries and reusable code for future use
  • Maintain, monitor, and update website features and performance
  • Optimize application for maximum speed and performance
  • Implement best SEO practices
  • Design and develop a well-tailored user experience

Additionally, front end developers should also possess or have experience with the following set of skills:

  • Proficiency in HTML and CSS
  • Knowledge and experience with JavaScript/jQuery
  • Automation tools, etc.

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Where To Find Front

There are various platforms where you can find jobs in front-end development, here are a few.


is a social network that links employers and professionals. There are various jobs updated every day on the jobs page.

If you see a job that interests you, you may easily click through the links and apply to it straight from LinkedIn. You should always fill up your profile with relevant details about yourself, skills and qualifications because your prospective employer will certainly check out your profile.

Stack Overflow

Stack Overflow is an online community that helps developers learn, share, build, and arguably one of the best places to find front-end developer jobs. Just like LinkedIn, you should complete your profile and participate in answering questions on the platform to improve your chances.


Indeed is a job listing website that allows job seekers to post their resume and employers list employment opportunities including front-end development jobs.


Toptal networks top talents in software engineering, design, finance, and project management around the world and connect them to companies. You can apply for a front-end developer job and join teams of distributed virtual developers and work from anywhere.


CareerBuilder provides job opportunities and advice to job seekers. They list employment opportunities for front-end development in various companies.

Explain What Is The Difference Between Class And Prototypal Inheritance In Javascript

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Inheritance in JavaScript is different from most other programming languages. The object system in JavaScript is prototype based, not class based. Objects in JavaScript are just a collection of a name and value pairs. When it comes to inheritance, JavaScript only has one construct: objects. Every object has a private property which contains a link to another object called its prototype.

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Define The Anonymous Function In Js

Generally, the function name is defined when we define the function itself, in normal user-defined functions, but in the case of an anonymous function, the function name is not defined. Here we make use of an assignment operator and variable to stow the function as an object, then utilizing that variable, we will be capable to invoke the function itself.


Describe What Is A Thread

A thread-local object is an object that is stored in a dedicated structure, attached to the current thread id. Flask utilizes thread local objects internally so that user dont have to pass objects around from function to function within a request to stay threadsafe. Thread local storage performs within the current thread. This approach is helpful, but it needs a valid request context for dependency injection or when attempting to reuse code which utilizes a value pegged to the request.

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What Is Eager And Lazy Loading

Eager loading – The default module-loading approach is eager loading. Eager loading feature modules are loaded before the program starts. You usually reserve this for applications that aren’t too large.

Lazy Loading – When there is a demand, lazy loading dynamically loads the feature modules. This speeds up the application. It’s utilized in larger applications where all the modules aren’t required right at the start.

What Do You Know About The Css Image Sprites And Why It Is Utilized

5 Front End Interview Questions That Every NEW Developer Should Know

CSS image sprites assist to render numerous images in a single line image. In a nutshell, the CSS sprites merge numerous photos into a single large image. If a web page comprises different images, then it would raise its loading time as for every image the browser has to send a distinct HTTP request, but with the help of sprites, we have a single image to request.

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Explain The Importance Of The Html Doctype

DOCTYPE is an instruction to the web browser about the version of the markup language the page is written in. The DOCTYPE declaration need to be the first thing in your HTML document, before the < html> tag. The Doctype declaration points to a Document Type Definition . The doctype provides markup language rules, so a browser can interpret the content correctly.

What Behavioral Interview Questions Should Front

To save you some time in your preparations, we’ve compiled a list of behavioral interview questions that a Front-End Developer is likely to face. The first few are quite general, but they’re tried and true. The last few are more directed to development concepts but are high-level enough that it’ll give the interviewer some insight into how you work and collaborate.

Keep that in mind when you prepare your answers. You want to answer truthfully, but you also want to make sure you’re conveying your strengths.

Behavioral Front-End Developer interview questions:

  • Why do you want to work at our company?
  • What are your hobbies outside of work?
  • Do you prefer working remotely or in person with your team?
  • How have you dealt with a team member not pulling their weight in the past?
  • How do you handle situations where too much is put on your plate?
  • How do you approach disagreements with your manager?
  • What was your last project? What did you struggle with?
  • How would you describe “great” code?
  • What can you bring to our company as a developer?
  • What is your current favorite mobile app? Why?
  • What was the last major challenge you faced in a program? How did you overcome it?
  • Can you tell us about a project that you were passionate about from your past experience?
  • How do you balance the need for innovation and the need for reliable code?
  • What’s your favorite website from a UI perspective? Why?
  • What are some things you’d improve on our company website?

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