Express.js Developers Hiring Guide

For Lightning-Fast Web App Deployment

Node.js is the open-source, cross-platform, backend JavaScript runtime environment that makes it possible to execute JavaScript outside of a web browser. This framework has become incredibly important to businesses looking to capture the energy and popularity of web applications. With Node.js, businesses can create lightweight, efficient, data-intensive applications that run in real-time across distributed devices.

Express.js (also called Express) is a modular web framework for Node.js. But why would you need a web framework for a runtime environment that already makes it possible to build web applications? The answer is simple: Node.js isn’t a framework. Remember, Node.js is the runtime that allows you to execute JavaScript outside of a web browser. When you employ Express.js, you can design and build web applications very quickly and easily. Why? Because Express.js is the web application framework built specifically to be used with Node.js.

What is a framework?

Before we continue, let’s define a framework. Within the realm of software engineering, a framework is an abstraction that provides generic functionality for specific software. One reason why frameworks are so popular is that they include libraries that can be used so engineers don’t have to reinvent the wheel. In other words, you can take various pre-built blocks of code and add them to a project to work more efficiently. 

Think of a framework as a template that can be modified by adding custom code to included libraries, image files, and reference documents. These frameworks:

  • Are easy to implement.
  • Include default, useful behaviors.
  • Allow for the building of reusable components.
  • Take control of the order of processing.
  • Can be extended.
  • Contain default framework code that can be modified.

That’s what Express.js is, a framework for Node.js that includes a good amount of code for the building of single-page, multi-page, or hybrid web applications.

  • Hiring Guide

  • Interview Questions

  • Job Description

Why does your company even need Express developers? First off, Express.js supports JavaScript, which is one of the most popular languages in use today. And because JavaScript is so easy to learn, getting up to speed with Express is much easier than many other frameworks.

But one of the biggest reasons your company should be employing Express is because you can develop and deploy different types of web applications very quickly. For example, without using Express, your developers would have to write the code necessary for routing components, which can be very tedious. Express.js provides for simple routing requests, so all your developers have to do is build on the included code.

Express is aptly named. This particular framework drastically cuts down the time required to deploy web applications. Your developers can probably cut the time required to deploy a web application in half. That's how efficient this framework is.

At this point, you might be asking yourself, "What can we build with Express.js?" The answer might be, "What can't you build?" One thing to remember is that you use Express.js in conjunction with Node.js, which makes it possible for you to develop in JavaScript.

So, JavaScript is the language, Node.js makes it possible to run the language outside of the web browser, and Express.js provides a robust set of features for the development of web and mobile applications.

What can you build with Express.js?

  • Web applications
  • Mobile applications
  • APIs
  • Frameworks

That's right, you can even build other frameworks from the Express.js framework. That's how flexible and important Express.js is.

What do you need to know to use Express.js?

To get the most out of Express.js, your developers will most certainly have to be familiar with JavaScript and Node.js. They'll also need to have a solid grasp on things like:

  • Frameworks
  • Web and mobile application development
  • APIs
  • Routing
  • Request handlers
  • Middleware
  • Various Node modules (such as the HTTP module)


If you want your business to be deploying web and mobile applications with a level of speed and efficiency that will keep you competitive, Express.js should be placed at the top of your list of developer requirements. If you don't already have software engineers available that can work with this framework, you should start looking immediately. The longer you wait, the further behind you’ll get.

What do you use Express.js for?

Express.js is an application framework that makes it possible to develop Node.js applications quickly and efficiently.

What are the steps for setting up an Express.js application?

  1. Create a folder with the same name as the project.
  2. Create a file named package.json within the new folder.
  3. Run the “npm install” command within the new folder.

How do you enable debugging in an Express.js application?

  • In Linux, issue the command: DEBUG=express:* node index.js.
  • In Windows, issue the command: set DEBUG=express:* & node index.js

How do you redirect 404 errors to a page in Express.js?

Add code similar to this in the Express.js app:

/* Define fallback route */
    app.use(function(req, res, next) {
    res.status(404).json({errorCode: 404, errorMsg: "route not found"});

We are looking for a talented developer with a high-level mastery of  Express.js to build efficient and exciting web and mobile applications. You will be responsible for working with the necessary technologies and teams to build these applications. You will also be responsible for integrating the front-end elements built by your co-workers into the application. Therefore, a basic understanding of front-end technologies is necessary as well.


  • Design, build and maintain efficient and reusable web and mobile apps with Express.js, Node.js, and JavaScript.
  • Integrate data storage solutions.
  • Implement performance and quality modes.
  • Identify bottlenecks and bugs and resolve all discovered issues.
  • Carefully monitor the performance of deployed software and constantly find ways to improve them.
  • Collaborate with cross-functional teams to define and design new features.
  • Stay up to date with new technology trends, applications, and protocols.
  • Help maintain code quality, organization, and automatization
  • Analyze user requirements to help inform application design.
  • Define application objectives and functionality.
  • Align application design with business goals and customer needs.
  • Produce detailed documentation.
  • Recommend changes to existing applications and the infrastructure used to build them.
  • Ensure continuous professional self-development.
  • Integrate user-facing elements developed by front-end developers with server-side logic
  • Write reusable, testable, and efficient code
  • Design and implement low-latency, high-availability, and performant applications
  • Implement security and data protection
  • Integrate data storage solutions

Skills And Qualifications

  • Degree in Computer Science or related field.
  • Experience with Node.js, JavaScript or Coffeescript, UX, database structures, and statistical analyses.
  • Basic understanding of front-end technologies, such as HTML5, and CSS3.
  • Understanding of the principles behind scalable applications.
  • Fundamental understanding of Version Control Systems (such as Git).
  • Solid problem-solving skills.
  • Excellent written and verbal communication.
  • Good organizational skills.
  • Ability to work as part of a team.
  • Attention to detail.
  • Understanding the nature of asynchronous programming and its quirks and workarounds
  • A positive attitude.

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