Drupal Developer Interviews


Hire Drupal Developers Interview Questions Guide

Drupal, a robust and flexible content management system, is widely used for building websites and web applications. When hiring Drupal developers, it’s crucial to assess their proficiency in Drupal development, PHP, theming, module development, and familiarity with Drupal best practices. This guide will assist you in navigating the hiring process effectively, enabling you to identify candidates with the right skills for your web development projects.

1. Reasons to Hire Drupal Developers

Embarking on the journey to hire Drupal developers? Here are key reasons to consider:

1.1 Content Management Expertise

Drupal developers bring specialized knowledge in content management, making them adept at creating and managing content-rich websites.

1.2 Customization and Theming

Drupal allows extensive customization, and Drupal developers excel in creating custom themes and templates for visually appealing and user-friendly websites.

1.3 Scalability

Drupal is known for its scalability, making it suitable for projects of varying sizes and complexities.

2. How to Hire Drupal Developers

Follow these steps for a successful Drupal developer hiring process:

2.1 Job Requirements

Define specific job prerequisites, emphasizing skills in Drupal development, PHP, MySQL, theming, and module development.

2.2 Search Channels

Utilize CloudDevs’ expertise to connect with potential Drupal developers. Leverage job postings, online platforms, and tech communities to discover talented individuals.

2.3 Screening

Scrutinize candidates’ Drupal proficiency, theming experience, module development skills, and understanding of Drupal best practices.

2.4 Technical Assessment

Develop a comprehensive technical assessment, including coding challenges and real-world scenarios related to Drupal development.

3. Core Skills of Drupal Developers to Look For

When evaluating Drupal developers, focus on these core skills:

  • Drupal Development: Proficiency in Drupal 7 and Drupal 8/9, including site building, configuration, and maintenance.
  • Theming: Experience in creating custom themes, using Twig templates, and ensuring responsive design.
  • Module Development: Knowledge of developing custom modules, extending Drupal’s functionality, and integrating third-party modules.
  • PHP: Strong understanding of PHP language features, object-oriented programming, and Drupal’s PHP-based architecture.
  • Database Management: Experience in working with MySQL databases and optimizing queries for performance.

4. Overview of the Drupal Developer Hiring Process

Here’s an overview of the Drupal developer hiring process:

4.1 Defining Job Requirements and Skillsets

Lay the foundation by outlining clear job prerequisites, specifying the skills and knowledge you’re seeking in Drupal developers.

4.2 Crafting Compelling Job Descriptions

Create engaging job descriptions that accurately convey the role, emphasizing Drupal-specific skills required.

4.3 Crafting Drupal Developer Interview Questions

Develop a comprehensive set of interview questions covering Drupal intricacies, theming, module development, and relevant technologies.

5. Sample Drupal Developer Interview Questions and Answers

Explore these sample questions with detailed answers to assess candidates’ Drupal skills:

Q1. Explain the difference between a content type and a content node in Drupal.


In Drupal, a content type is a pre-defined collection of settings for how content of a certain type should be displayed and structured. A content node, on the other hand, is an individual piece of content created using a specific content type. Content types define the structure, while nodes are instances of that structure.

Q2. How can you create a custom theme in Drupal 8?


Creating a custom theme in Drupal 8 involves the following steps:

  • Create a folder for your theme in the themes directory.
  • Create a *.info.yml file to define the theme.
  • Create a *.libraries.yml file to manage libraries and assets.
  • Create template files, including page.html.twig for overall page structure.

Q3. Write a Drupal 8/9 Twig template code to display a list of articles.


{# Sample Answer: Twig template code to display a list of articles #}

{% for item in items %}


 <h2>{{ item.title }}</h2>

 <p>{{ item.body.summary }}</p>


{% endfor %}


Q4. Explain the purpose of the Update API in Drupal.


The Update API in Drupal is used to update the database schema and execute other tasks when a module is updated. It ensures that changes to the structure of the database are applied consistently across all instances of a Drupal site.

Q5. How can you create a custom module in Drupal?


To create a custom module in Drupal:

  • Create a folder for your module in the modules directory.
  • Create a *.info.yml file to define the module.
  • Create a *.module file to write PHP code for the module.
  • Enable the module using Drush or the Drupal admin interface.

Q6. Write a Drupal hook function to alter the title of a node before it is displayed.


// Sample Answer: Drupal hook to alter the node title

function mymodule_preprocess_node(&$variables) {

 $variables['title']['#markup'] = t('Modified: @title', ['@title' => $variables['title']['#markup']]);



Q7. Explain the purpose of the Features module in Drupal.


The Features module in Drupal is used for capturing and managing site configuration in code. It allows developers to package configuration settings, content types, views, and more into a feature module that can be exported and deployed to other Drupal sites.

Q8. How can you optimize the performance of a Drupal site?


Performance optimization in Drupal involves strategies like:

  • Caching: Configuring and optimizing caching settings.
  • Content Delivery Network (CDN): Using a CDN to serve static assets.
  • Database Optimization: Optimizing database queries and structure.

Q9. Write a Drupal 8/9 route callback function that returns JSON data.


// Sample Answer: Drupal route callback returning JSON data

use Symfony\Component\HttpFoundation\JsonResponse;

function mymodule_json_callback() {

 $data = [

 'message' => 'Hello, this is JSON data!',

 'timestamp' => time(),


 return new JsonResponse($data);



Q10. Explain the purpose of the Paragraphs module in Drupal.


The Paragraphs module in Drupal allows content creators to build flexible and modular content structures. It provides a field type that can reference different types of paragraphs, each with its own set of fields. This enables the creation of complex and reusable content structures.

6. Hiring Drupal Developers through CloudDevs

Step 1: Connect with CloudDevs

Initiate a conversation with a CloudDevs consultant to discuss your project requirements, preferred skills, and expected experience.

Step 2: Discover Your Ideal Match

Within a short timeframe, CloudDevs presents you with carefully selected Drupal developers from their pool of pre-vetted professionals. Review their profiles and select the candidate who aligns with your project’s vision.

Step 3: Embark on a Risk-Free Trial

Engage in discussions with your chosen developer to ensure a smooth onboarding process. Once satisfied, formalize the collaboration and commence a week-long free trial.

By leveraging the expertise of CloudDevs, you can effortlessly identify and hire exceptional Drupal developers, ensuring your team possesses the skills required to build remarkable websites and web applications.

7. Conclusion

With these additional technical questions and insights at your disposal, you’re now well-prepared to assess Drupal developers comprehensively. Whether you’re developing a new website, customizing themes, or building complex web applications, securing the right Drupal developers for your team is pivotal to the success of your web development projects.