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interview questions

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ExpressJS, first released in 2010, was created to address issues with Node.js and make Node.js easier to learn and use.
ExpressJS, the brainchild of TJ Holowaychuk, is a Node.js web application framework that offers features making the building of web and mobile applications easier and more flexible. It also enables the fast and easy creation of robust APIs.

When Node.js was released in 2009, it was met with a lot of optimism and excitement. Node.js allowed server-side code to be written using JavaScript — something that had not been possible before.
Although revolutionary, problems soon became apparent with Node.js.
Simply put, Node.js was complex. Developers had to write complicated server-side logic even for simple operations like:

  • Creating a server

  • Listening for requests

  • Handling those requests

  • Sending back responses

This complexity made Node.js not only unpleasant to work with but also very challenging for beginners to learn.

ExpressJS has since grown into one of the most popular Node.js frameworks. It is widely used for building backends and creating APIs.
Some major companies that use ExpressJS include:

  • Twitter

  • IBM

  • Uber

  • Lenovo

  • Fox Sports

When hiring an ExpressJS developer, an ideal candidate should have extensive knowledge of JavaScript, a strong grasp of Node.js, and deep experience working with ExpressJS itself.
Additionally, familiarity with frontend technologies such as HTML, CSS, and frontend frameworks like React, Angular, and Vue is an added advantage.

Aside from technical capabilities, ExpressJS developers should:

  • Communicate effectively

  • Work well in a team

  • Innovate and problem-solve

  • Be eager to learn and improve their skills

ExpressJS Developer Experience Levels:

Entry-level ExpressJS Developer:

  • Solid understanding of JavaScript, Node.js, HTML, and CSS

  • Ability to develop simple web applications

  • Familiarity with creating servers, handling requests and routing, templating, and working with APIs

  • Ability to troubleshoot and debug basic problems

  • Deep interest in learning and developing using Express

Intermediate ExpressJS Developer:

  • Proficient in building more complex applications with Node.js and Express

  • Experience working with databases such as MongoDB or MySQL

  • Ability to build complex APIs

  • Skilled in session and cookie handling, validation, authentication, payment integration, and file uploads

  • Knowledge of security best practices and contribution to application design and architecture

Senior ExpressJS Developer:

  • Extensive experience in Node.js, ExpressJS, and frontend frameworks

  • Deep understanding of web development concepts, DevOps, databases, and code optimization

  • Ability to handle complex development errors

  • Responsible for application security, data handling, and performance optimization

  • Leadership skills and mentoring ability

  • Full-stack experience typically includes using the MERN (MongoDB, Express, React, Node) or MEAN (MongoDB, Express, Angular, Node) stack

Interview Process for Hiring ExpressJS Developers:

  1. Resume Review
    Review resumes to assess if candidates meet requirements and to understand their skills and experience.

  2. Technical Screening
    Conduct a phone or video call to engage candidates in discussions around development and the role, assessing their technical background.

  3. Technical Interview
    Assign a task to build a simple working Express application or solve problems requiring Express understanding.

  4. Non-technical Interview
    Assess soft skills like communication, teamwork, leadership, and problem-solving abilities through behavioral questions.

  5. Reference Review
    Contact references to get third-party feedback about the candidate's work ethic, experience, and any potential red flags.

  6. Contract Offer
    Extend an offer to the candidate who meets both the technical and cultural fit for your team.

Throughout the interview process, ensure clear communication with candidates to make the experience pleasant and professional for both sides.

We are currently hiring skilled and motivated ExpressJS developers to join our development team.
As an ExpressJS developer at [company name], your responsibilities will include:

Responsibilities:

  • Working as part of a team developing and maintaining applications and APIs using ExpressJS and Node.js

  • Adding and integrating backend server-side logic to support frontend development

  • Writing clean, reusable, testable, documented, and efficient code

  • Integrating databases into applications and ensuring optimal performance

  • Developing and managing server-side components

  • Debugging, troubleshooting, and fixing errors that arise during development

  • Implementing solid security and data protection protocols to ensure the security and availability of applications

  • Providing suggestions and ideas for improvements to enhance application performance

Requirements:

  • Bachelor's degree in Computer Science or related field, or equivalent professional experience

  • Solid understanding of JavaScript, Node.js, and ExpressJS

  • Familiarity with frontend technologies such as HTML and CSS, and frontend libraries/frameworks like React, Angular, or Vue

  • Experience working with databases

  • Keen attention to detail and strong debugging skills

  • Knowledge of designing and creating APIs

  • Expertise in building robust, secure applications using Agile Development Methodologies

  • Excellent communication skills and ability to work effectively in a team

  • Strong organization and time management skills

Some good questions to ask in an ExpressJS interview include:

Question 1: What is the difference between Express middleware and routers?

This is an important question to test a candidate's understanding of key ExpressJS concepts that make building with the framework easier and more flexible. It also gauges their ability to clearly and concisely explain technical concepts.

A great answer differentiates the two:

  • Middleware functions have access to the request and response objects and are executed in a specific order. To move from one middleware to the next, the next() function must be invoked.

  • Routers guide how an application’s endpoints respond to client requests based on the paths in the URL. Routers handle HTTP methods like GET and POST.

A good answer might simply define middleware and routing without explaining how they work together.

Question 2: Write an ExpressJS application that handles both GET and POST requests sent to the same endpoint.

This question tests a developer’s familiarity with basic ExpressJS concepts like:

  • Creating a server

  • Listening for requests

  • Middleware usage

  • Handling multiple HTTP methods

View sample code snippet here

A good answer may not handle other HTTP methods besides GET and POST. Candidates should be guided to think critically about all possible scenarios.

Question 3: Write a piece of code that implements error handling in an Express application.

Error handling is crucial in ExpressJS applications to prevent them from breaking during runtime.
This question also assesses a developer’s:

  • Use of middleware for error handling

  • Familiarity with HTTP status codes

View sample error handling code here

A good answer might handle errors but omit sending appropriate status codes. Such developers can be coached on good debugging and error reporting practices.

Question 4: Write an ExpressJS application that shows how to implement a RESTful API for a to-do list application.

This question gauges a developer’s experience working with RESTful APIs.

View sample RESTful API code here

A good answer will demonstrate an app that properly runs, parses incoming data using .json(), and stores items into a to-do list.

Question 5: Explain how you would optimize the performance of an ExpressJS application.

This tests a developer's understanding of optimization strategies. Strong answers could mention:

  • Using a load balancer to distribute load across servers

  • Setting up a proxy server like NGINX

  • Caching responses for efficiency

  • Database optimization (e.g., indexing for faster reads)

  • Keeping the application updated with security patches

A good answer references at least a few of these strategies.

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your project, your timeline, your way

your project, your timeline, your way

We don't believe in one-size-fits-all hiring. Whether you need a single developer for 20 hours a week, a full team for a three-month sprint, or anything in between—we've got you covered. No rigid contracts, no minimum commitments, just the right talent for exactly what you need

your project, your timeline, your way

We don't believe in one-size-fits-all hiring. Whether you need a single developer for 20 hours a week, a full team for a three-month sprint, or anything in between—we've got you covered. No rigid contracts, no minimum commitments, just the right talent for exactly what you need

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Augment your team for specific sprints pr development cycles. Perfect for product launches, feature rushes, or handling seasonal workload spikes.

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