Senior Frontend Developer Interview Preparation Guide
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Senior Frontend Developer Frequently Asked Questions in various Senior Frontend Developer job interviews by interviewer. The set of questions are here to ensures that you offer a perfect answer posed to you. So get preparation for your new job interview

44 Senior Frontend Developer Questions and Answers:

1 :: When would you use CSS float?

Float is used when you want to make an element of your page (usually an image) be pushed to the right or left and make other elements wrap around it.
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2 :: Tell us how are the variables of CoffeeScript different from those of JavaScript?

In JavaScript, variables need to end with a semi-colon for them to be executed. However, with CoffeeScript, there is no necessity to add a semi-colon at the end of every statement. Hence, CoffeeScript simplifies the process of adding a semi-colon to variables.
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3 :: Tell us how do you do testing? And what do you think about this? How would you improve QA?

Good code means a less buggy web applications and fewer coding crises. A good web developer should value testing and respect the QA process, because it will cut down on the number of late nights where they try to find an issue which has been uncovered in the code.
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4 :: Suppose you can’t work out how to solve a coding problem. What do you do to find the answer?

Do you ask a colleague, Stack Overflow, or other platforms? There’s no right or wrong answer here. In fact, a combination of both may be the best route. What is interesting is to see whether your candidate prefers to keep their head down or ask around if faced with a problem.
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5 :: Tell us the purpose of each of the HTTP request type when using a RESTful web service?

Does your candidate know the difference between a GET and a POST request? Do they remember to mention PATCH and CONNECT requests? We hope so. This is a solid question to assess their basic understanding of HTML.
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6 :: Tell us have you ever used an MVC? If so, which one and what do you like or dislike about it?

MVC stands for Model View Controller. MVCs typically organise web applications into a well-structured pattern, making code easier to maintain. The term is well-known by developers and some famous examples of MVCs include Backbone.js and AngularJS. What makes this question interesting is not whether the interviewee has used a MVC, but what his or her preferences and experience reveal. Candidates who are able to articulate why they use one MVC over another, show that they are engaged in what they do, care about the technology they use, and have considered different options. You want to be able to trust your front end developer to keep up to date with new relevant technologies and have a clear idea of when and what should be used.
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7 :: Tell me the concept of a CSS float and provide an example of its usage?

This technical question quizzes the applicant on their understanding of a common CSS element. This basic question is a good way to screen the interviewee and ensure that they're more than acquainted with CSS. What to look for in an answer:

A concrete definition of CSS floats
Examples of how the applicant uses this element in their code
Confidence in explaining this technical concept to any audience
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8 :: Tell me what Is An Iife?

IIFE stands for immediately-invoked function expression; it executes immediately after created by adding a () after the function.
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9 :: Tell us have you already used MVC before? What you like/dislike about it?

As the UI gets more and more complex we need some good ways to keep it more and more maintainable and reusable, and Some MVC frameworks for javascript have been widely adopted lately and it's a good plus if you have already used before and knows what's the benefits of them. The most famous MVC frameworks are backbone.js and angular.js, it's hard to not hear about them.

There are many advantages in using these frameworks, I can point out some of them:

☛ Organization: Forces your webapp to follow a well structured pattern;
☛ Maintainable: With organization comes an easy to maintain code;
☛ UI Binding: Some frameworks allow you to do that. So everytime your model changes, the view reflects it and vice-versa;
☛ Decoupled client: MVC frameworks like backbone.js incentivise you to use REST API's though their urlRoot attribute in their Models;
☛ Reusable components: Create reusable visual components;
☛ Single-page apps: Build single-page apps with Ajax requests;
☛ Friendly URL's: Native support for client-side url mapping;
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10 :: Tell me what makes up a good Front-End Developer? What are his responsibilities?

Before speaking about who a Front-End Developer is, it is important to know what front-end is all about. Front-End, for a website, concerns all the components that the user accesses as part of his interactions with the website. So, it is all about the inclusion of buttons, color schemes, images, forms, animations and typography.

So, the job of a front-end developer basically involves the creation of user-friendly components of a website. He is a software programmer who writes codes for all the features of a website that will improve its functionality, in a number of creative ways. Making the best use of his innovative and creative web development skills, it is the prime responsibility of a front-end developer to ensure that the look and feel of a particular website is uniform across different web browsers.
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