UI Developer Interview Questions and Answers - If you're looking for UI Developer Interview Questions for Experienced or Freshers, you are at right place.
In information technology, the user interface (UI) is everything designed into an information device with which a person may interact. This can include display screens, keyboards, a mouse and the appearance of a desktop. The goal of this interaction is to allow effective operation and control of the machine from the human end, whilst the machine simultaneously feeds back information that aids the operators' decision-making process.  It is also the way through which a user interacts with an application or a website. The growing dependence of many companies on web applications and mobile applications has led many companies to place increased priority on UI in an effort to improve the user's overall experience. The UI interface is often talked about in conjunction with user experience (UX), which may include the aesthetic appearance of the device, response time and the content that is presented to the user within the context of the user interface. An increasing focus on creating an optimized user experience has led some to carve out careers as UI and UX experts. Certain languages, such as HTML and CSS, have been geared toward making it easier to create a strong user interface and experience.
Some key Points for UI developer:
  • Create Web application front end as per design comps and information architecture
  • Plan and estimate projects and reports hours to administration for billing
  • Integrate front-end application with the application business layer
  • Follow best practices and standards for accessibility and cross-browser compatibility
  • Collect feedback from design and technical staff on Website development needs
  • Understand executing accessibility and progressive enhancement presentation
  • Stick to established coding standards and group procedures individually and in teams
  • Plan and estimate projects and reports hours to administration for billing
  • Add to engineering team’s culture of high code quality
  • Coordinate with Interface Design Architects for meeting accessibility standards at code level
  • Create conceptual diagrams, visual mock-ups, and manage detailed user interface specifications
  • Conduct usability testing to resolve interface problems
  • Engage in requirement specification process for new software functionality
  • Ensure design consistency with client’s development standards and guidelines
  • Design and build UIs on any server platform in a team environment
  • Guide and maintain developer teams and best practices
What is UI developer?
UI Developers are usually more technically sound as compared to Web developers. The role of UI / UX developer is to focus on the way the functionality is displayed and the detail on how users interact with the users.  They code for the functioning of the front end interface or User Interface. They tend to have excellent problem solving skills and are generally good in mathematics. On a daily basis, a developer writes code in five or more different languages including (X) HTML, CSS, JavaScript, jQuery, and XML. UI Developers can also be found wielding some kind of text editor, three or more Web browsers, and development plugins (for example: Mozilla Firebug). UI developer should have expertise in JavaScript reference and the jQuery documentation. A developer also knows what an API is and how to develop a user interface using an API.

Which Skills are required to become a UI Developer?
  • HTML/HTML5, CSS/CSS3, JavaScript AND JQuery
  • Modern application programming languages, such as Java, .Net, AJAX, PHP, XHTML and Ruby
  • Photoshop, Illustrator, Flash & Flex to mockup UI elements.
  • AngularJS and Unit Testing
  • SEO
  • User Research and CMS
  • Usability and Analytics
  • Visual Design and Content Strategy
How do you optimize a website’s assets?
File concatenation, file compression, CDN Hosting, offloading assets, re-organizing and refining code, etc. Have a few ready.

What are the new feature of HTML5?
  • New Doctype: doctype html
  • Media Support: audio and video support
  • Figure Element
<figure>
<img src="path/to/image" alt="About image" />
<figcaption>
<p> This is an image of earth </p>
</figcaption>
</figure>
  • Flawless Content Editing
  • Canvas element
  • Article and Section
What is Semantic HTML?
Semantic HTML is a coding style where the tags embody what the text is meant to convey. In Semantic HTML, tags like for bold, and for italic should not be used, reason being they just represent formatting, and provide no indication of meaning or structure. The semantically correct thing to do is use and. These tags will have the same bold and italic effects, while demonstrating meaning and structure (emphasis in this case).

What does DOCTYPE mean?
The term DOCTYPE tells the browser which type of HTML/HTML5 is used on a webpage. In turn, the browsers use DOCTYPE to determine how to render a page. Failing to use DOCTYPE or using a wrong DOCTYPE may load your page in Quirks Mode.

What is SVG?
SVG stands for Scalable Vector Graphics, It is an XML based two-dimensional vector graphics image format. In contrast to JPEG and GIFimages on the Web, which are bitmapped and always remain a specified size, SVG images are scalable to the size of the viewing window and will adjust in size and resolution according to the window in which it is displayed.

What Is JQuery?
A JavaScript Framework/Library that make things like DOM selection/manipulation, AJAX, and animation, easier.

What is the use of HTML5 Canvas element?
HTML5 Canvas element is used to draw graphics on a web page by the help of JavaScript.

What is the use of 'placeholder' attribute in HTML5?
Placeholder is used to display some text with in a textbox or text area and the text will disappear when user start typing in that box.

How would you organize your JavaScript code?
First create a folder called, eg. APP now you can keep subfolders like app+ assetts+ JavaScript+ custom+ vendor+ images in custom folder you can keep your own JavaScript file and in vendor keep files like jQuery, underscore.js, which mean libraries that you've used.

What are the new features of CSS3?
  • Box Shadows
  • CSS3 Selectors
  • CSS3 Text Shadow
  • Web safe Font Additions
  • Rounded Corners
  • Border Images
  • Opacity Levels
  • Create 2D and 3D transformations, animations, and transitions
  • Transform
What is CSS Box Model?
CSS Box Model includes content, margin, padding, and border. Total width is equal to width + padding + margin + border. These properties occupies space on box model.

What is JavaScript Debugging?
Debugging is not easy. But fortunately, all modern browsers have a built-in JavaScript debugger. Built-in debuggers can be turned on and off, forcing errors to be reported to the user with a debugger, you can also set breakpoints (places where code execution can be stopped), and examine variables while the code is executing. You activate debugging in your browser with the F12 key, and select "Console" in the debugger menu.

What are the limitations when serving XHTML pages?
Perhaps the biggest issue is the poor browser support XHTML currently enjoys. Internet Explorer and a number of other user agents cannot parse XHTML as XML. Thus, it is not the extensible language it was promised to be.

How do I know it’s a JavaScript problem in website?
JavaScript is used to make different behaviors happen on your site. These behaviors are all done through the Visitor of the sites browser. Examples of this are Image Slide Shows, Pop Up boxes, Menus, and more. When your website loads, but the behaviors on your site stopped working, this is usually because of the JavaScript code not working.

What is Post/Redirect/Get means?
Post/Redirect/Get (PRG) is a web development design pattern that prevents some duplicate form submissions, creating a more intuitive interface for user agents (users). PRG supports bookmarks and the refresh button in a predictable way that does not create duplicate form submissions.

What is the DOM?
The Document Object Model (DOM) is a programming interface for HTML and XML documents. It represents the page so that programs can change the document structure, style, and content. The DOM represents the document as nodes and objects. That way, programming languages can connect to the page.

What is the difference between linking to an image, a website, and an email address?
To link an image, use tags. You need specify the image in quotes using the source attribute, src in the opening tag. For hyperlinking, the anchor tag, , is used and the link is specified in the href attribute. Text to be hyperlinked should be placed between the anchor tags. Little known fact: href stands for “HYPERTEXT REFERENCE.” When linking to an email, the href specification will be mailto:send@name.com.

What is the difference between standards mode and quirks mode?
Quirks Mode is a default compatibility mode and may be different from browser to browser, which may result to a lack of consistency in appearance from browser to browser.

What the use of SmoothCam Filter is and how it works?
Smooth Cam filter in Final Cut Pro is to analyze a clip’s complete media file before the effect can be played or rendered in real time.  SmoothCam filter requires two independent phases:
Motion Analysis: Pixels are analyzed in successive frames to determine the direction of camera movement. It stored the analysis data on disk
Motion Compensation: During rendering or real time playback, the SmoothCam filter avails the motion analysis data to implement a “four-corner” transformation to each frame.

Explain how you can add text in final cut pro?
  • In the time-line double click, in order to display it in the Viewer window at the top. At the lower end of the viewer, tap on the icon with big letter A, which indicates the text button
  • In the viewer window “Text” will appear in the viewer window. Tap the controls tab to open the text editing window
  • Type your text into the text box
  • Use the options or tools, given below the text box to change the font, size, style and color
  • To add your text into the Timeline, under Viewer, click on the video tab, then drag and drop the text into the timeframe where you wanted it to appear
What is output of "20" + 20?
"2020". First 20 is string type, second is numeric, for addition, both should be numeric.

What is output of "20" + 20 + 20 and "20" + (20 + 20)?
"20" + 20 + 20 = "202020". "20" + (20 + 20) is "2040"

What is JavaScript Hoisting?
In JavaScript Hoisting, A variable is declared first and then called. If variable is declared on bottom and called earlier, value will be undefined. Only assigned values are hoisted in JavaScript, like string, numbers etc. Undefined and function declaration can be called before declaration as they are not hoisted, and there is no assignment operator (=) in both.

What is the Difference In between a Web Developer & UI Developer?
The difference between a web developer as well as a UI developer is:
Web Developer: A specific with the abilities necessary to develop a whole end-to-end internet solution.
UI Programmer: A specific with a much more discipline-specific skill set connected with the appearance, really feel and also functionality of an application or websites.
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