10 Frontend QA Engineer Interview Questions and Answers for frontend engineers

flat art illustration of a frontend engineer

1. Can you walk me through your experience with a testing framework (e.g. Selenium, Cypress)?

Throughout my experience as a Frontend QA Engineer, I have utilized Selenium extensively to automate website testing. One project I worked on involved testing an e-commerce website for a client that had a large number of products and frequently changing inventory.

  1. To start, I created a script using Selenium to perform a basic login functionality test. This involved entering valid and invalid login credentials to ensure the system rejected unauthorized access and allowed authenticated access.
  2. Then, I created more detailed test cases to automate the checkout process, simulate user input, and verify that the website functioned as expected when a high volume of users were active. This required me to use methods such as 'find element by ID' and 'find element by class name' in order to select and interact with various elements on the page.
  3. Ultimately, my use of Selenium reduced the amount of time it took to manually test the website by 50% and the company saw a 20% increase in sales.

Recently, I have also started using Cypress in some projects. I found that it has a simpler setup process and faster execution time, allowing for more efficient continuous integration and deployment. One of the most challenging projects I worked on using Cypress involved testing a complex React application with many interactive and dynamic components. However, by understanding the structure and functional areas of the application, I was able to create effective test cases and significantly reduce the number of bugs that made it to production.

In summary, my experience with both Selenium and Cypress has allowed me to efficiently and effectively test websites and applications, leading to increased productivity and better end results for clients.

2. How do you ensure test coverage across different browsers and devices?

Ensuring test coverage across different browsers and devices is crucial in today's world of multiple platforms and devices. Here are some steps I take to ensure adequate coverage:

  1. Creating a browser/device compatibility matrix: To start, I create a spreadsheet that lists all the browsers and devices that our application needs to support. I prioritize the most commonly used ones and focus testing efforts on those.
  2. Automated cross-browser testing: Using tools like Selenium, I create automated testing scripts that run on different browsers and devices. This allows for efficient testing and catches any issues that might arise on certain devices or browsers that weren't caught during manual testing.
  3. Manual testing on selected devices: While automated testing is effective, I also believe in the importance of manual testing, especially on devices that may be less common or have a history of compatibility issues. This helps to catch any additional issues that may have been missed during automated testing.
  4. Regular testing across browsers and devices: Lastly, I ensure that testing is regularly conducted across browsers and devices, even after deployment. This ensures that any new issues introduced as a result of updates or changes can be caught and addressed in a timely manner.

In my previous role, these measures led to a significant reduction in the number of bug reports related to cross-browser and device compatibility. In fact, we were able to reduce such issues by 70% within the first quarter of implementing these measures.

3. How do you approach testing for accessibility?

As a frontend QA Engineer, ensuring accessibility is a crucial part of my testing approach. To do this, I follow a few essential steps:

  1. Conduct a manual evaluation: I manually test the website with a screen reader and keyboard. This approach helps me understand how users with disabilities interact with the website and identifies any potential issues.
  2. Use accessibility tools: I use various accessibility tools like WAVE, AChecker, and Axe. These tools help identify accessibility issues such as missing alt attributes and contrast ratio violations.
  3. Run automated tests: I use automated testing tools to ensure that the website complies with accessibility standards, such as WCAG 2.0 or 2.1. Automated testing also helps me save time and ensures that I do not miss any accessibility issues.
  4. Collaborate with developers: I work closely with developers to ensure that they understand the importance of accessibility and help them implement best practices. This approach ensures that the website design and development processes are accessible from the start.

Implementing an accessibility testing approach has yielded positive results in my previous projects. For example, I worked on a website that had accessibility issues affecting users with visual impairments. After implementing the above strategy, we saw a 30% increase in website traffic from users with disabilities. This improvement reflected positively both in the website's user experience and the client's reputation.

4. What are your thoughts on usability testing?

Usability testing is an integral part of ensuring that a product is user-friendly and meets the needs of its target audience.

Personally, I believe that usability testing should be conducted throughout the entire development process, not just at the end. This allows for any issues to be identified and addressed early on, saving time and resources in the long run.

I have had experience conducting usability testing in the past, and the results have been extremely valuable in shaping the final product. For example, in one project, we conducted usability testing on a new feature before releasing it to our users. The feedback we received allowed us to refine the feature and make it more intuitive, resulting in a 20% increase in user engagement.

In addition to this, I also believe in using both quantitative and qualitative methods to evaluate usability. While metrics such as task completion time and error rates are important, it is also crucial to gather feedback from users in order to gain a deeper understanding of their needs and pain points.

Overall, I believe that usability testing is essential for delivering a high-quality product that meets the needs of its users. By conducting this type of testing regularly and using both quantitative and qualitative methods, companies can stay ahead of the curve and ensure that their products are truly user-friendly.

5. Tell me about a time when your test automation efforts helped to catch a critical bug.

During my time as a frontend QA Engineer at XYZ Company, I implemented test automation efforts that proved to be very effective in catching critical bugs. One particular instance that stands out was when our team was working on a new feature for the company’s website.

As part of my testing efforts, I had created an automated testing script using Selenium WebDriver that would run through the newly developed feature and verify all the functionalities of the feature. During one of the test runs, the script caught a critical bug that had the potential to cause severe issues for the website’s users.

The bug was related to the checkout process and could have led to incorrect charges being applied to the users' accounts. Thanks to the automated testing script, we were able to catch the bug before it could cause any harm to the website’s users.

After fixing the bug, we ran the automated test script again and confirmed that the bug had been resolved. The automated test script was then added to our continuous integration process, which ensured that the bug would not reoccur in any future updates.

In this instance, our test automation efforts not only ensured the quality of the feature but also prevented any potential monetary costs that could have resulted from incorrect charges being applied.

  1. Implemented automated testing script using Selenium WebDriver to test new feature
  2. Caught a critical bug in the checkout process that had the potential to cause incorrect charges
  3. Fixed the bug and added the automated test script to the continuous integration process to prevent future occurrences
  4. Prevented potential monetary costs from incorrect charges being applied to users' accounts

6. What tools and techniques do you use to troubleshoot issues in a browser?

As a frontend QA engineer, I use various tools and techniques to troubleshoot issues in a browser. Some of these include:

  1. Developer Tools: I use developer tools such as Chrome DevTools, Firefox Developer Tools or Safari Web Inspector to inspect and debug HTML, CSS and JavaScript issues in the browser. These tools allow me to see network requests, view code, and monitor console errors.
  2. Selenium WebDriver: I use Selenium WebDriver to automate tests on different browsers and operating systems. It allows me to simulate user interactions and verify expected results. By using a combination of programming languages such as Python, Java, or JavaScript, I am able to write robust and reliable tests that catch potential issues and regressions.
  3. CrossBrowserTesting: I use CrossBrowserTesting to perform cross-browser functional and visual testing. This tool allows me to test my website on multiple browsers and devices simultaneously. By taking screenshots and recording videos of my tests, I can quickly identify issues and troubleshoot them.
  4. BrowserStack: I also use BrowserStack to perform similar tasks as CrossBrowserTesting. This tool offers a wide range of browser and device combinations for testing. By using their debugging tools, I can quickly isolate issues and troubleshoot them.
  5. User Testing: I use user testing tools like UserTesting.com or UsabilityHub to gather feedback from real users. By giving them specific tasks to complete on my website or application, I can gain insight into any usability or functionality issues that they may encounter. I then use this feedback to improve the user experience.

Using these tools and techniques, I have been able to troubleshoot and resolve hundreds of issues over the years. For example, on a recent project, I used Selenium WebDriver to automate end-to-end tests on a new feature. The tests caught a bug that was causing some users to experience a blank screen after completing the checkout process. By addressing this issue, we were able to reduce the cart abandonment rate by 25% and increase revenue by $50,000 per month.

7. How do you ensure that your test cases are maintainable and reusable?

As a frontend QA engineer, I understand the importance of maintainable and reusable test cases. Here are a few steps that I follow to ensure that my test cases are maintainable and reusable:

  1. Develop a naming convention: I create a clear and consistent naming convention for my test cases. This makes it easier for me and other team members to find and understand specific test cases.
  2. Use parameters: I use parameters in my test cases to make them more reusable. For example, I might use an email address parameter that I can easily update in multiple test cases. This helps to reduce the amount of duplicated test cases.
  3. Document test cases: I write detailed comments within the test cases to help explain the purpose and expected results. This helps other team members to understand the test cases and make any necessary updates in the future.
  4. Review and update test cases regularly: I review and update my test cases regularly to ensure that they are up-to-date and accurate. This helps to prevent any issues from arising due to outdated or incorrect tests.
  5. Track test case results: I track the results of my test cases and use this information to identify areas for improvement. This helps me to continually refine and improve the test cases to make them more efficient.

By following these steps, I have seen a significant improvement in the maintainability and reusability of my test cases. For example, I was able to reduce the amount of duplicated test cases by 25%, and the time required to update test cases has decreased by 20% over the past year.

8. Can you give an example of how you've collaborated with designers and developers to improve overall quality?

During my time at XYZ Corporation, I collaborated closely with the design and development teams on a major project to improve the user interface of our company's core product. One specific instance where I helped to improve overall quality was when I noticed a potential issue with the design of a new feature.

  1. I scheduled a meeting with the lead designer to discuss my concerns and proposed solutions.
  2. Together, we decided on a redesign that would improve the functionality and user experience.
  3. I then worked closely with the developers to ensure the new design was properly implemented and thoroughly tested before release.

The results were significant – after the redesign, our customer satisfaction ratings for that specific feature increased by 20%, and the number of reported issues decreased by 15%. By collaborating with both the design and development teams, I was able to contribute to a more user-friendly and high-quality product.

9. Can you describe a time when you identified a gap in the testing process and implemented a new testing strategy to address it?

During my time working at XYZ company, I noticed that our frontend testing process was lacking in identifying visual inconsistencies and errors. Many bugs were only caught during the manual review process, which led to delays in our release timeline.

To address this issue, I proposed implementing a visual regression testing tool that would automatically compare screenshots of different builds to detect any variations or inconsistencies. After receiving approval from my team lead, I researched and identified the best tool for our needs and then integrated it into our testing process.

The results were significant - we were able to catch visual issues much earlier in the development process, reducing the number of bugs that made it to the manual review stage. This resulted in a 25% decrease in bug reports and a 10% reduction in development time for each project.

  1. Identified gap in testing process in visual consistency detection
  2. Proposed solution of integrating a visual regression testing tool
  3. Successfully researched and integrated the tool into testing process
  4. 25% decrease in bug reports
  5. 10% reduction in development time for each project

10. How do you stay up to date with the latest testing trends and technologies?

Staying up to date with the latest testing trends and technologies is vital for any Frontend QA Engineer. I make sure to stay current by:

  1. Reading industry blogs such as Guru99 and Software Testing Help to learn about the latest testing tools and methodologies.
  2. Attending conferences such as STAR EAST and CAST to gain insights from experts and get hands-on experience with new tools.
  3. Networking with other QA professionals on sites like LinkedIn to stay up-to-date on the latest trends and to share tips and tricks.
  4. Taking courses on platforms like Udemy and Pluralsight to learn new skills and techniques.
  5. Participating in online QA communities like r/QualityAssurance and Gitter to stay current on industry discussions and share ideas with others.

By staying up-to-date, I'm able to bring new ideas and approaches to each project, which often leads to increased efficiency and better results.


Congratulations on mastering these 10 Frontend QA Engineer interview questions and answers in 2023! But your job-seeking journey doesn't end here. Writing a compelling cover letter is crucial to stand out from the crowd. Check out our guide to writing a captivating cover letter. Also, make sure to prepare an impressive CV to showcase your skills and accomplishments. Our guide to writing a standout resume for frontend engineers can help you with that. Finally, if you're on the search for a remote frontend engineer job, head to our job board to find exciting opportunities that match your skills and preferences. Best of luck on your journey!

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