Here are some common UI Developer interview questions that will help you assess the knowledge of a candidate of the programming elements mentioned above.
1. What Are the Different Ways to Reduce Page Load Time?
The right answer is - remove unnecessary widgets, compress images, put CSS at the top and script references in an external file or at the bottom, HTTP compression, caching, minimize redirects, and reduce lookups.
Page load is an important aspect of UI development and so the candidate should have an advanced knowledge of the subject.
Both front-end and back-end developers have to work together. Also, many times front-end developers have to continue with the work done by previous employees. The candidate needs to have an understanding of the commenting throughout to move the project forward. It is also necessary that candidate follows standard coding practices that include code organization and code commenting and shows a willingness to make things easily understandable for others.
3. What Is a Major Sign That a Website Has Issues and Not Responsive?
It is one of the important UI developer interview questions that check candidate knowledge about website performance. The right answer is the presence of a horizontal bar in desktop screens or mobile is an indication that the website has responsive issues.
4. What Makes a Good Color Scheme?
Some of the good color schemes used by developers are:
Monochromatic- using different hues of the same tint such as using pale green with deep green. This color scheme is good for background and foreground combination.
Analogous – using colors that stand next to each other on the rainbow wheel. For example- blue and green, orange and yellow, red and purple. This color scheme is ideal for elements placed next to each other.
Complimentary- using colors that stand opposite to each other on the rainbow wheel. For example- green and red, blue and yellow, orange and purple. These color pairs can be used in is background and foreground colors.
5. Which Video Formats You Prefer for Embedded Videos and Why?
The right answer is major browsers and OS support MP4 format, so it is the preferred format for embedded videos. To ensure there is no compatibility issue, you need to keep copies of videos in WebM and OGV formats and all formats should be listed as source elements in the video tag.
It is necessary the candidate knows about general video formats supported by web browsers and knows how to handle exceptions.
Even though the majority of the front-end development work is done through GUI, it would be good if the candidate has a mastery over major coding languages. These UI developer interview questions ( ) help you check a candidate’s overall knowledge of front-end development and related technologies.