10 Cloud testing Interview Questions and Answers for qa engineers

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If you're preparing for qa engineer interviews, see also our comprehensive interview questions and answers for the following qa engineer specializations:

1. What experience do you have with cloud testing?

As an experienced cloud tester, I have worked on various projects with different cloud technologies, such as AWS, Azure, and Google Cloud. In my previous role, I led a team in testing an e-commerce website that was migrated to AWS. My team and I have developed a comprehensive testing plan that includes functional, performance, and security testing. We also utilized automated testing tools and scripts for our regression testing.

The result of our testing efforts was outstanding. Our testing process has uncovered critical vulnerabilities in the website, such as SQL Injection and Cross-Site Scripting (XSS). Our performance testing also showed that the website can handle up to 10,000 concurrent users, which is 200% more than the expected traffic. Our efforts have helped the development team to prioritize and fix issues, resulting in a stable and secure website launch.

  1. Experience with AWS, Azure, and Google Cloud
  2. Developed comprehensive testing plan for an e-commerce website migrated to AWS
  3. Utilized automated testing tools and scripts for regression testing
  4. Uncovered critical vulnerabilities in the website such as SQL Injection and XSS
  5. Performance testing showed website can handle 10,000 concurrent users, 200% more than expected traffic

2. What are some of the most important considerations to take into account when testing applications in a cloud environment?

When testing applications in a cloud environment, it's important to consider the following:

  1. Scalability: Cloud applications need to be able to scale up or down according to demand. It's crucial to test how the application behaves when traffic spikes occur. For example, our team tested a cloud-based e-commerce platform and found that it could handle up to 10,000 concurrent users before experiencing any slowdowns.
  2. Reliability: Cloud environments can be prone to downtime due to server outages or network issues. Testing for reliability involves simulating these scenarios and seeing how the application responds. We tested a cloud-based project management tool and found that it had an uptime of 99.9% over a six-month period.
  3. Security: Cloud applications are vulnerable to security breaches, so testing for security is essential. Our team tested a cloud-based banking application and found that it was able to withstand SQL injection attacks and cross-site scripting attacks.
  4. Compatibility: With the wide range of devices and browsers available, it is important to test an application's compatibility with different configurations. Our team tested a cloud-based portfolio management tool and found that it was compatible with 95% of devices and browsers in use today.

Overall, testing cloud applications requires a thorough understanding of both cloud technologies and the application being tested. By paying close attention to scalability, reliability, security, and compatibility, our team has consistently delivered high-quality software that meets our clients' needs and exceeds their expectations.

3. How do you ensure that cloud-based applications work well across different platforms and devices?

As a cloud testing professional, I understand the importance of making sure that cloud-based applications deliver their intended functionality across different platforms and devices. To ensure this, I follow a structured approach to testing that includes:

  1. Creating a comprehensive test plan that details the intended use cases of the application
  2. Building a test suite that covers all features and functionalities of the application
  3. Using a variety of emulators and simulators to test the application on different devices and platforms
  4. Running manual and automated tests to identify any compatibility issues
  5. Performing regression testing to ensure that any changes or updates to the application do not impact its compatibility with different platforms and devices

Along with this, I use analytics tools to gain insights into user behavior and device usage patterns. By analyzing this data, I can identify trends and patterns that help me optimize the application for specific devices and platforms.

For example, in my previous role, I tested a cloud-based application that was designed for both iOS and Android devices. By using emulators and simulators to test the application on different devices and platforms, I was able to identify several compatibility issues that were impacting the application's performance on certain devices. After addressing these issues and running regression tests, I was able to increase the application's overall compatibility rating to 95%.

4. What tools do you use to test cloud-based applications?

As a Cloud Testing Engineer, I use various tools to test cloud-based applications. Some of my favorite tools are:

  1. JMeter: I use JMeter to perform load testing on cloud servers. In my current position, I was able to simulate over 5000 users concurrently accessing a cloud-based application with JMeter, which helped identify bottlenecks early in the development cycle.
  2. Selenium: I use Selenium for functional testing of web applications that are hosted in the cloud. I have experience working with Selenium Grid to execute parallel testing across multiple browsers and operating systems. This helped speed up our testing process by 60% in my previous position.
  3. BlazeMeter: BlazeMeter is another tool I use for load testing cloud-based applications. With its reporting and analysis capabilities, I was able to pinpoint exactly where slow load times were occurring in our cloud-based application, and identify the root cause for various performance issues.
  4. Postman API: I use Postman API to test RESTful web services in the cloud. This tool helps me create, test, and manage APIs and generate detailed test reports easily.
  5. Ghost Inspector: I use Ghost Inspector for UI and regression testing. Its intuitive UI helped me quickly create automated tests that we could run every time there was a release in our cloud application; this helped us catch bugs before they became customer-facing issues.

Overall, my tools selection depends on the problem I am trying to solve or the test scenario I need to execute. I am always willing to learn and incorporate new tools if they can help me be more effective in my testing role.

5. Can you describe a time when you had to troubleshoot a particularly challenging cloud-based issue?

During my previous role as a Cloud Operations Engineer at XYZ Corp, we faced a major issue where our cloud-based application was experiencing severe latency issues. It was affecting our end-users' experience, and we were losing potential customers rapidly.

  1. Firstly, I checked the system logs and performance metrics to see if any specific services or components were causing the latency issue.
  2. After thorough investigation, I found that the database server was experiencing an abnormally high number of connections, which was causing slow query execution.
  3. I decided to optimize our existing database queries and restructure the database tables to reduce the number of connections to the server, and improve query execution speed.
  4. Additionally, I implemented a database caching solution, which helped to reduce the database load and improved overall application performance.
  5. After executing these solutions, we noticed a significant improvement in the application's performance. Specifically, the latency issue decreased by 75%, and the response time improved by 50%.

Moreover, I was appreciated in the company's newsletter and was awarded the "Most Valuable Employee" for the quarter by the management.

6. Can you describe your approach to testing data stored in the cloud?

I always approach testing data stored in the cloud by first understanding the architecture of the cloud platform and the database management system used to store the data. This allows me to identify any potential security vulnerabilities or data accessibility issues that may arise during testing.

  1. One effective technique I use is to create test cases that cover both positive and negative scenarios. For example, testing the system's ability to handle unexpected data inputs or unauthorized access attempts.
  2. Another technique I use is to integrate automated testing tools into the testing plan. This helps to save time and resources and ensure that the process is efficient and thorough.
  3. During testing, I also pay close attention to the performance of the cloud platform, database response times, and system availability. Any bottlenecks or issues can be easily identified and addressed.
  4. Once the testing is complete, I conduct a detailed analysis of the results to identify any areas that require further attention. I report any issues found to the development team with detailed descriptions and recommended solutions.
  5. To ensure that the data stored in the cloud is secure, I also perform regular vulnerability assessments and penetration testing. This helps to identify any potential security breaches and allows for mitigation strategies to be put in place.

Overall, my approach to testing data stored in the cloud is comprehensive and focused on ensuring the security and accessibility of the data. By implementing thorough testing techniques, regularly monitoring performance, and conducting vulnerability assessments, I am confident in my ability to provide high-quality testing results.

7. Can you walk us through your experience with different cloud platforms like AWS, Azure, or GCP?

During my time as a cloud testing specialist, I have had the opportunity to work with a variety of cloud platforms including AWS, Azure, and GCP.

  1. AWS: I have utilized a variety of AWS services such as EC2 for creating and managing virtual machines, S3 for storing and retrieving data, and Lambda for executing code without provisioning or managing servers. In my previous project, I implemented automated testing for an e-commerce site using AWS Device Farm which reduced the testing time by 40% and improved the app's performance.
  2. Azure: While working with Azure, I have gained experience in creating and managing virtual machines, configuring network settings, and using Azure App Service for deploying web apps. I've also utilized Azure DevOps for continuous integration and deployment. In my previous project, I integrated Azure Application Insights to monitor the performance of an API and implemented automated tests using Selenium and JMeter.
  3. GCP: In my recent project, I worked on GCP to build a web application using Google Kubernetes Engine (GKE). I utilized Google Cloud Storage for storing images and videos, Firestore for maintaining user data and Firebase Authentication for user authentication. I also incorporated load testing using Apache JMeter and implemented a CI/CD pipeline using Jenkins.

In summary, my diverse experience with AWS, Azure, and GCP has enabled me to use the best tools and services for each project based on their needs and requirements, resulting in successful project completion and improved application quality.

8. How do you stay up-to-date with the rapidly evolving world of cloud computing and testing?

Staying up-to-date with the latest trends and technologies in cloud computing and testing is crucial for any professional in my field, and I take various steps to ensure that I am always on top of the game.

  1. I regularly attend webinars and online training courses on cloud computing and testing to stay informed about new developments and best practices. In the last year, I have completed more than 10 courses and attended 20 webinars.

  2. I also read tech blogs and subscribe to industry newsletters, such as TechCrunch and Wired, to stay informed about the latest cloud computing and testing news.

  3. To expand my knowledge base and gain hands-on experience, I participate in open-source projects and collaborate with developers from different communities. In the last year, I have contributed to three open-source projects related to cloud computing and testing.

  4. Finally, I attend industry conferences and events to network and learn from experts in the field. In the last year, I attended three major conferences on cloud computing and testing, where I learned about the latest trends and emerging technologies.

By consistently engaging in these learning opportunities, I am confident that I can apply industry best practices and remain a valuable asset to any organization that I work with.

9. What metrics do you use to identify performance and scalability issues with cloud-based applications?

Metric identification is a crucial aspect of ensuring that cloud-based applications run smoothly without performance or scalability issues. The following are the metrics I use:

  1. Request Latency - I measure the elapsed time between a user's request and when the server sends the response. If request latency is too high, it might indicate a problem with the server or the network.
  2. Throughput - This metric measures the number of requests processed over a given period. A reduction in throughput may indicate that the application is struggling to keep up with demand, and it might be time to scale up.
  3. Error rates - These are the rate at which requests fail. A high error rate could indicate a bug affecting the code or network infrastructure.
  4. CPU Utilization - This measures the amount of CPU resources used by the application per instance. If the usage reaches 100%, it means that it is time to scale the application horizontally
  5. Memory Utilization - I monitor the amount of memory used by the application instance. If the memory usage gets too high, it can affect performance and cause the application to crash.
  6. Transaction per Second - This metric is the amount of transactions per second that the application can handle before experiencing errors or other issues.
  7. Response Time - I measure the time taken to respond to a request after it has been processed. A high response time may indicate poor architecture, code issues, or a need to optimize the database or file system.
  8. Failure Rates - This measures the number of subsequent failures that occur after a series of processes on a system.
  9. Concurrency - Concurrency measures the number of requests processed at the same time. If concurrency is high and performance is dropping, it's often because the resources aren't enough to handle the number of simultaneous requests.
  10. Network Latency - This is a measurement of the time it takes for a packet of data to travel from one point to another in the computer network. High latency can slow down requests and degrade the user experience.

In a previous position, I used these metrics to improve the performance of a cloud-based application that was experiencing frequent downtime, which lost revenue for the company. By identifying and correcting scalability issues through these performance and scaling metrics, we reduced downtime by 70%, increased throughput by 55%, and achieved a 21% increase in customer satisfaction.

10. Can you describe your experience with testing both public and private cloud environments?

Throughout my career, I have gained extensive experience in testing both public and private cloud environments. In my previous role as a Cloud Testing Engineer at XYZ Company, I was responsible for developing and executing test plans for various cloud-based applications in both public and private cloud environments.

  1. For public cloud environments, I worked extensively with AWS and Azure, ensuring that applications were tested thoroughly and met all compliance and security standards. One of my key achievements in this role was reducing downtime for an AWS-hosted application by 50% through rigorous load testing and optimizing the infrastructure.
  2. When it came to private cloud environments, I worked with OpenStack and VMware, delivering a number of successful projects. For example, I led the testing effort for a VMware-hosted application that needed to scale rapidly to support a sudden surge in traffic. Through meticulous scalability testing and infrastructure optimization, we were able to ensure that the application could handle the increased load without any downtime or performance issues.

To summarize, I have extensive experience in testing both public and private cloud environments, and have a strong track record of delivering successful projects by combining rigorous testing with infrastructure optimization.


Congratulations on making it through our list of 10 Cloud testing interview questions and answers in 2023. However, the journey towards landing your dream remote QA engineer job is not yet over. Your next step is to prepare a cover letter that showcases your skills and experience. Check out our guide on writing a cover letter for QA engineers here to increase your chances of standing out from other applicants. Remember that a polished resume is also crucial to catch the attention of recruiters. We have a guide on how to write an impressive CV for QA Engineers, which you can access here. Finally, if you're looking for remote QA engineer jobs, our website has a job board dedicated specifically to this role. Start your job search now by clicking here. Good luck on your journey towards finding your dream remote job!

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