Four Web Developer Interview Questions You Must Ask

While interviewing web developers, you need to figure out their knowledge about different languages like JavaScript, HTML5, and CSS. You can frame your web developer interview questions in two ways: knowledge-based and skill based. Knowledge-based questions will be based on technical aspects and skill-based on his/her execution skill.

Here are four such questions that will help you hire the right web developer for your organization. Take a look:

1. What Is a Canvas? What Is Its Default Border Size?

The HTML element is used to draw graphics on the fly using JavaScript. The Canvas element is only a container for graphics. You would require to use JavaScript to actually draw the graphics. Canvas has different methods for drawing circles, paths, text, boxes, and adding images.

By default, the border size of Canvas element and size of its drawing surface is 300 screen pixels wide and 150 screen pixels high. Although, the canvas element size can be increased but the drawing surface remains the same.

Make sure the candidate is well aware of the limitations of the drawing surface size.

2. What Is CORS and How Does It Work?

It is one of the important web developer interview questions that test the depth of a candidate’s knowledge about XML. CORS stands for Cross-Origin Resource Sharing. It is a mechanism that gives access to external resources on a webpage from other domain. CORS uses the XMLHttpRequest object to exchange data with a web server behind the scene.

XMLHttpRequest plays a critical role in reducing page load time. One of the major advantages of XMLHttpRequest is that it can help update specific parts of a webpage without reloading the entire webpage.

3. List out the advantage of HTTP/2 as compared with HTTP 1.1

The advantages of HTTP/2 over HTTP/1.1 are:

·  HTTP headers data compression

·  Server push technologies

·  Parallel loading of page elements over a single TCP connection

·  Prioritization of request

4. Explain what long polling is

Long polling is a web application development pattern used to emulate a push mechanism for server-client communication. When the long polling is used, the client sends a request to the server, and the connection remains intact until the server is ready to send data to the client. The connection will be closed only after the data is sent back to the client or connection timeout occurs.

Also, while hiring you need to keep in mind that a good developer

· Should know HTML, CSS,SQL,PHP/Ruby/Python, JavaScript

· Coordinate with other designers and programmers to develop web projects.

· Assume ownership of code throughout staging, development, testing, and production.

Along with these web developer interview questions you need to assess the key capabilities of a web developer as well. You can find out how they overcome the challenges like in case of system failure what would be their contingency plans, how to fix bugs, troubleshoot etc.

So what questions do you ask a web developer? Do you’ve any questions? Please feel free to leave your comments below.