9 QA Engineer interview questions and answers

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1. How would you define a quality product?

The interviewer wants to gauge your understanding of product quality. Remember to talk about functionality, reliability, usability, and efficiency.

"A quality product is one that meets its functional requirements; it should be reliable and efficient, yet easy to use for the general audience. In the hands of the consumer, it should bring value, have little to no defects, and should come with excellent customer service throughout the product’s lifespan.”

2. How do you determine what to test in an application?

The interviewer wants to know your approach to testing scope. Discuss how you understand the application, its requirements, and use cases to identify testing needs.

Sample Answer:

"I begin by understanding the application and its intended functionality. I review the requirements and use cases, and collaborate with the development and product teams to identify key functionalities and potential risk areas to test."

3. What experience do you have with automated testing?

Companies want QA Engineers who have a good chunk of experience with automated testing. What they really want to hear about are the automation tools you have used and how they are applied in your projects.

Sample Answer:

"I have extensive experience with test automation. I've used tools like Selenium for automating web application tests and JUnit for unit testing in Java. In previous roles, I have been the sole individual responsible for automation framework setup as well as writing and maintaining automation scripts.” 

4. Can you describe the difference between validation and verification?

The interviewer wants to gauge your understanding of fundamental QA concepts. When answering, explain the difference between validation and verification in software testing.

Sample Answer:

"When it comes to quality assurance, validation and verification are two important aspects. When you are ensuring a product meets specific requirements at a particular stage in the development process, it is verification. When software is being evaluated at the end of the development process to assess if it meets customer expectations, it is validation.”

5. Can you describe a time when you found a critical defect in a product?

The interviewer wants to know your defect discovery and reporting process. To answer, provide an example of a critical defect you discovered, and discuss how you documented and reported it.

Sample Answer:

In a previous role, I discovered a critical defect that caused the application to crash when performing a specific action. I documented the defect, providing details about the exact steps to reproduce it, the expected and actual results, and any relevant screenshots. I reported this to the development team immediately for resolution."

6. How do you manage testing when project schedules slip or change?

The interviewer wants to assess your adaptability and prioritization skills. When responding, discuss how you adjust your testing plans and prioritize your testing efforts in response to schedule changes.

Sample Answer:

"When schedules change, I first reassess the testing priorities based on the product's risk and business priorities. I may need to focus on testing the most critical functionalities and using techniques like risk-based testing to maximize testing efficiency."

7. How do you decide which test cases to automate?

This question aims to understand your approach to test automation. To respond, talk about how you determine which test cases are suitable for automation.

Sample Answer:

"Generally, tests that are run frequently, that are time-consuming to perform manually, and that have a predictable and consistent outcome are good candidates for automation. Also, stable features, where the tests are unlikely to change often, are suitable for automation."

8. What is regression testing, and why is it important?

The interviewer wants to check your understanding of regression testing. To answer, explain what regression testing is and why it is important in software testing.

Sample Answer:

"Regression testing involves retesting software after you've made some modifications. It helps to ensure that existing functionality still works as expected. It's important because changes, additions, or fixes in the code could cause issues with working functionality."

9. How do you stay updated with the latest testing tools and trends?

The interviewer wants to understand how you maintain your technical knowledge. To answer, talk about how you follow industry news, take part in professional communities, take courses, or read books.

Sample Answer:

"I read industry blogs and publications to keep up with the latest tools and trends. I also participate in online forums and communities where testing professionals share their experiences and insights. Additionally, I attend workshops and webinars, and take courses to deepen my knowledge."

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