Ext JS Interview Questions With Sample Answers (Plus Tips)

Updated 10 February 2023

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To maximise your chances of succeeding in a job interview, it helps to adequately prepare yourself. For developers interviewing for Ext JS positions, recruiters may ask a series of general questions before asking some technical questions about your background and qualifications. Anticipating what kind of questions you may receive enables you to formulate effective responses and perform better on the day of the interview. In this article, we present various Ext JS interview questions, offer sample answers and provide some tips on how to make a good first impression.

General Ext JS Interview Questions

During the initial stages of the interview, it is typical for employers to ask generalised Ext JS interview questions. This helps them uncover facts about you as an individual and gauge your suitability to work with the company and its employees. Here are some general questions you can expect to hear from the interviewer:

What is your most important professional skill?
How would you describe your leadership abilities?
Where do you see yourself in five years?
What impact do you plan to make at the company within your first 90 days of employment?
What is your greatest personal achievement?
What is your greatest work-related achievement?
What are your weaknesses?
Why did you leave your last position?
How does getting this job align with your career goals?
How do your friends describe you?
What are your hobbies outside of work?
What made you choose a career in this industry?

Ext JS Interview Questions On Background And Experience

To see how suitable you are for the position the employer is advertising, interviewers may ask you specific questions about your educational background and professional experience. These questions usually centre on information from your CV. A strong familiarity with the details of your CV is important as this can save you the extra labour of formulating answers on the day of the interview. Here are some typical questions you can expect to encounter:

How many years of experience do you have?
What do you find difficult about Ext JS?
What are the most important skills for developers?
How long have you worked with Ext JS?
What were your main duties in your previous position?
Do you hold any relevant certifications?
Do you have any techniques for staying motivated?
How do you stay ahead of industry developments?
Can you write in more than one programming language?
How long did it take you to master Ext JS?

In-Depth Ext JS Interview Questions

To examine the full extent of your competencies, it is typical for recruiters to ask in-depth technical questions about Ext JS and surrounding subjects. This gives you a chance to tell them how you approach challenges and how you apply your knowledge to perform important tasks relating to Ext JS. Below are some examples of in-depth questions your interviewer may ask:

Can you name five features of Ext JS?
What are the benefits of using Ext JS?
What year did the latest stable version of Ext JS come out?
What are the different components of Ext JS?
Which major web browsers does the Ext JS framework support?
What is the most difficult part of using Ext JS for you personally?
What are the various types of alert boxes in Ext JS?
What is the purpose of MessageBox?
What is the function of element objects?
What are widgets?

Sample Questions With Answers

To aid your preparation, here are some questions that recruiters may ask during an Ext JS interview with example answers:

What is Ext JS?

You are likely to hear this question, as this tests your fundamental knowledge of the subject and immediately tells recruiters whether you are the right person for the job. Showing that you understand Ext JS and the surrounding terminology demonstrates that you are a suitable candidate. Try to answer by offering a brief definition of Ext JS and what its primary use is.

Example answer: "Ext JS is a JavaScript application framework that professionals use to create web apps with cross-browser functionality. People typically employ Ajax, DHTML and DOM scripting techniques when using Ext JS to produce web applications. Professionals can either use it as a complete framework to create single-page applications or as a simple component framework. The main browsers it supports are Chrome, Safari 6+, IE6+, FF and Opera 12+."

Do you plan to pursue any further education?

Planning to pursue further education signals to employers that you invest in your personal development, meaning your value as an employee may increase over time. You and your prospective employer benefit from you continuing your education, as it means they receive better quality work, and you gain additional credentials. If you hear this question, be sure to reference specific courses or certifications so your interviewer knows you are serious about it.

Example answer: 'Yes. In fact, I plan to enroll in the Certified Ext JS Developer programme later this year as I believe this can aid my career progression and boost my earning potential. Once I achieve this certification, I believe I can produce work superior to that of my current level, so my value to your company is set to increase as time passes. I also take a refresher course online every year to stay up to date with trends in the industry and remind me of key terms and practices.'

What is your greatest strength as a developer?

Questions about your strengths help employers figure out how capable you are and confirm whether you possess the skills they desire. If this question arises, try to answer it in a way that impresses the recruiter, such as by describing your competence in a particularly challenging area. It is a good idea to review the job description prior to your interview to check which desirable skills they are looking for, then touch on these when describing your strengths.

Example answer: 'In terms of technical skills, my greatest strength is the fact that I know multiple coding languages, and this is something I am very proud of. After learning the first two or three languages, I began to notice patterns in other programming languages, in terms of syntax and semantics. This made it easier for me to keep learning new languages, to the point where I am now proficient in using JavaScript, HTML, Python, C++ and CSS. This knowledge makes me a highly effective programmer and allows me to produce excellent quality work.'

Tips To Help Prepare For An Ext JS Interview

To help you make a good impression during your interview, try to implement some of the following tips:

Research the dress code

You can make a good impression on interviewers by dressing appropriately for the occasion, as this shows that you are considerate and eager to impress. Researching the company dress code or speaking to an existing employee is the best way to inform your choice of outfit. If the employees of the company wear a uniform or formal attire, it is best to emulate this style of dress with a suit or a dress with a button-down blouse. If there is no dress code or the dress code is informal, opt for smart casual attire to ensure you look presentable.

Review your CV

Many of the questions that arise during the interview are likely to focus on the contents of your CV, so it is important to refresh your memory in this regard before the interview. Employers usually ask questions about specific experiences and qualifications to ensure that they prepare you for the job. Reviewing your CV can help you predict what questions you might receive, which you can then use to devise responses prior to the interview. This helps you cut down on thinking time and provide answers quickly. When discussing your skills and experience, try to link them to work-related scenarios.

Review the job description

Reviewing the job description is another way to prepare for the questions employers are likely to ask, as they typically seek to connect your skills and experience to the job criteria. The required qualifications, for example, are highly likely to come up, so it is important to prepare and rehearse your responses in this area. There may also be a section in the job description that lists additional desirable qualifications, which you can use to predict questions and prepare answers. Touching on the desirable qualifications in your answers and not just the required ones can show that you are particularly qualified.

Bring notes

It is usually acceptable to bring notes along to your interview. In fact, bringing notes can demonstrate your organisational skills and conscientiousness. It is often a good idea to prepare some questions before an interview to ask the recruiter, which shows that you are curious and passionate while also giving you additional valuable information about the role. Consider performing some research on the company, its background and its policies and use this information to produce a list of questions. Be sure to keep your questions professional and only ask about work-related subjects.

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