In this blog, we’ll be sharing with you some important interview questions you need to ask a developer to get to know their skills, experience, and how they work. We’ll also be including some of the answers you should be looking for. Let’s dive in!
The goal of asking introductory questions is to get to know a candidate a little better and not to test their technical skills. Their answers give you some insight on how they react, think, and would potentially fit into your organization.
Asking this question helps you determine upfront if they’re using the same platforms as you.
This question gives you an idea of how a candidate pursues further education.
Here, you should be looking for answers such as functional programming or test-driven development. This is an important question especially if you’re hiring a freelance developer as it gives you some insight on how they keep their projects relevant, usable, and profitable over time.
This question tests a developer’s ability to overcome differences in preferences using the right tools. The candidate should recommend using a standard formatting tool so everyone’s code will look the same when pushed to the repository.
A candidate should be able to state that it is an object-based, dynamically-typed, weakly typed, interpreted, multi-paradigm programming language. Furthermore, he or she should be able to mention that it is a core web technology (alongside HTML and CSS) that started out as a client-side scripting language but can now be used server-side.
The answers should be: Number, String, Boolean, Function, Object, and Undefined.
This means that the type of variables can change at runtime.
A callback function is a function that is called after another function has finished executing.
For this question, you’re looking at a candidate’s understanding of limitations or tradeoffs of web technology.
A closure is a locally-declared variable that is related to a function. It stays in memory after the function has returned.
Namespacing is important because it helps avoid naming conflicts, logically separate code, and make the code more usable.
A candidate should be familiar with and implement different types of testing such as unit testing, integration testing, and UI/Functional testing. A candidate should be able to recommend tools to use such as Ava, Protractor, Phantom, Chai, and more.
Again, this answers to this question will vary. It can give you an idea of a candidate’s familiarity and degree of experience using these tools.
If you’re looking for a senior developer who will be part of the design process of your application, it’s important to know their experience working with software architecture.
Bugs and errors are common when writing code so you need to understand how a candidate approaches them. Ask them to describe a time when they encountered a particularly difficult error in a project. Ask them about the debugging tools they used as well as what they learned from the experience.
Apart from getting a glimpse of how a candidate likes to code, this question also helps determine if he or she takes the time to understand the task first.
Senior developers may need to work with less experienced developers who may be prone to making mistakes. The candidate could mention aspects such as functionality, readability, style, conventions, and security flaws.
Let them recount past projects and clients they’ve worked with. It’s important to ask if they’ve worked on projects similar to yours.
Let them go into detail about their past projects, how they addressed errors and issues, and what they’ve learned from that experience.
Ask the candidate if they’ve coded different projects like eCommerce websites, user interfaces, URL encoding, or event delegation.
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