10 Application Infrastructure Engineer Interview Questions and Answers for infrastructure engineers

flat art illustration of a infrastructure engineer

1. What inspired you to pursue a career as an Application Infrastructure Engineer?

Throughout my academic and professional career, I have always been drawn towards the world of technology and infrastructure. As I learned more about the field, I realized that the role of an Application Infrastructure Engineer was the perfect fit for my skills and interests.

One of my proudest achievements was during my time at a previous company, where I was responsible for designing and implementing a new application infrastructure that resulted in a 50% increase in system uptime and a 25% decrease in response times. Seeing these concrete results and being able to contribute to the success of the company motivated me to further pursue a career in Application Infrastructure Engineering.

  1. Can you give an example of a complex web infrastructure implementation you designed?
  2. What application development frameworks have you worked with and implemented on infrastructure?
  3. Can you walk me through your process when troubleshooting infrastructure issues?
  4. How would you approach scaling up infrastructure for a growing company?
  5. What is your experience with cloud infrastructure and do you think it is the future?
  6. How do you stay up to date with trends and technologies in the infrastructure space?
  7. Have you ever implemented caching or load balancing mechanisms, and how did they affect the performance of the application?
  8. What is the most difficult infrastructure issue you have addressed and how did you solve it?
  9. How do you balance security and accessibility when designing an application infrastructure?
  10. What do you think is the most important aspect of being an Application Infrastructure Engineer?

2. What specific skills and experience do you bring to the table that make you an ideal candidate for this role?

My Skills and Experience for Application Infrastructure Engineer

  1. Extensive experience in cloud infrastructure development and maintenance, particularly with AWS and Kubernetes. Developed and released several microservices into the production Kubernetes cluster that led to a 30% reduction in overall infrastructure costs.

  2. Proficient in programming languages, such as Python, Java, and Go, with an ability to automate manual processes and reduce deployment time by 60%.

  3. Developed and implemented CI/CD pipelines, utilizing tools such as Jenkins, Ansible, and Terraform, leading to a 40% reduction in build time and an increase in deployment frequency by 2x.

  4. Strong understanding of security best practices and experience working with various security protocols, including SAML and OAuth2. Designed and implemented security protocols for a banking application that increased the security level from 70% to 85%.

  5. Excellent troubleshooting skills with a track record of resolving complex issues within tight deadlines. Resolved a critical outage in the production environment within 1 hour, avoiding an estimated loss of $50k in revenue.

With my extensive experience and demonstrated ability to work in complex environments whilst meeting tight deadlines, I am confident that I can contribute to the success of this role as Application Infrastructure Engineer.

3. What motivates you the most in your work as an Application Infrastructure Engineer?

What motivates me the most as an Application Infrastructure Engineer is the ability to solve complex problems and improve system efficiency. I find it extremely rewarding to tackle a difficult task and come up with a solution that not only resolves the issue, but also makes the system run faster and smoother.

For example, in my previous role as an Application Infrastructure Engineer for a large e-commerce company, I was tasked with optimizing the company's server infrastructure. By implementing load balancing and caching techniques, I was able to reduce server response time by 50% and improve site speed by 40%. This resulted in a noticeable increase in sales and customer satisfaction.

Knowing that my work directly impacts the success of a company is a huge motivation for me. I am constantly looking for ways to improve the system and make it run more efficiently. That drive to continuously improve and make a difference is what drives me to excel as an Application Infrastructure Engineer.

4. Can you describe your experience with infrastructure automation and configuration management tools?

One of my core responsibilities as an Infrastructure Engineer is to automate and manage infrastructure using configuration management tools. I have extensive experience working with tools like Chef, Puppet, and Ansible to automate infrastructure provisioning and configuration management.

  1. I led a project to automate the deployment of a web application to AWS Elastic Beanstalk using Chef. This reduced deployment time from hours to minutes and decreased the error rate from 15% to less than 1%.
  2. I configured Puppet to manage the configuration of a large-scale Hadoop cluster, ensuring consistency across all nodes and reducing manual configuration time by 50%.
  3. Using Ansible, I automated the deployment of a highly available MongoDB cluster on AWS EC2 instances. This reduced the deployment time from days to hours and eliminated the need for manual intervention.

My experience with infrastructure automation and configuration management tools has helped me optimize deployment workflows and improve the reliability and scalability of infrastructure. I am always looking for ways to improve automation and streamline processes, and I am excited to continue learning and implementing new tools and technologies.

5. What is your experience with working on highly available applications and systems, and ensuring application scalability?

Throughout my career as an Application Infrastructure Engineer, I have had the opportunity to work on multiple projects involving high-availability and scalable systems. One of the most noteworthy applications I have worked on is a payment processing system for a major e-commerce platform.

  1. To ensure high-availability, we implemented a multi-region architecture with automatic failover capabilities.
  2. We utilized AWS services such as Elastic Load Balancing, Auto Scaling, and Route 53 to distribute traffic across multiple regions and ensure that the system was able to handle spikes in traffic without any downtime.
  3. In terms of scalability, we designed the system to be horizontally scalable by using microservices architecture and containerization.
  4. We utilized container orchestration tools like Kubernetes to manage scalability and load balancing when handling high traffic loads.
  5. As a result of these efforts, we were able to achieve a 99.99% uptime for the payment processing system and handle an average of 100,000 transactions per second during peak times.

Overall, my experience with highly available and scalable systems has taught me the importance of designing for failure and ensuring that systems can handle spikes in traffic. I believe that this experience will prove invaluable in any role as an Application Infrastructure Engineer, and I look forward to applying my knowledge and skills to contribute to the success of the organization.

6. How do you usually approach troubleshooting complex infrastructure issues and what tools do you typically use?

When troubleshooting complex infrastructure issues, I usually follow a systematic approach to diagnose and resolve the problem. My first step is to gather as much information as possible about the issue by analyzing logs, inspecting system metrics, and checking service status. This helps me to identify the scope and severity of the issue, and determine if the issue is impacting other systems or users.

  1. Check Logs: I start by checking system logs, error messages, and other log files to see if there are any clues about the issue.
  2. System Metrics: I check system metrics like CPU usage, memory usage, disk I/O, and network traffic patterns to identify any potential bottlenecks or spikes in activity.
  3. Service Status: I check the status of key services, applications, and processes to see if they are running as expected, and if they are communicating with other systems.
  4. Debug Tools: If the issue isn't immediately apparent, I'll use debugging and diagnostic tools like Wireshark, TCPDump, or Pingplotter to help identify the root cause of the issue
  5. Collaboration: I collaborate with other team members to identify potential issues and get feedback on my approach

Recently, we identified an issue where our application was intermittently failing to connect to the database server. Using this approach, I was able to diagnose the root cause of the issue, which was a connectivity issue caused by a misconfigured firewall rule. Once I identified the issue, I was able to quickly resolve it and prevent it from happening again in the future.

7. What are some strategies you use to stay current with advances in infrastructure technology and best practices?

At the start of my career, I realized that staying current with the latest infrastructure technology advances and best practices is critical to remain relevant as an engineer. Here are some of the strategies I use:

  1. Attending industry conferences and meetups: I attend an average of 3-4 conferences per year. These conferences give me an opportunity to meet with other professionals and learn firsthand from industry leaders. In 2022, I attended the AWS Summit, the HashiConf EU, and the KubeCon.
  2. Reading technical blogs and publications: I am passionate about reading blogs and publications that cover infrastructure technology. I am a big fan of the AWS blog and frequently read industry publications such as TechCrunch, ZDNet, and InfoWorld. As a result of my regular reading, I am the first to learn about the latest infrastructure technology advances.
  3. Conducting research projects: At our organization, we have frequent hackathons which allow me to test new and relevant infrastructure technology. As a result of the hackathons, I have worked on projects such as building a scalable GitLab runner and implementing a green-blue deployment methodology. These projects give me hands-on experience to stay current with technology advances.
  4. Continuous education: Being an Application Infrastructure Engineer means continuous learning. I use online learning platforms such as Pluralsight and Udacity to sharpen my skills. In 2022, I completed two courses on Docker and Kubernetes. These courses allowed me to get hands-on experience with container orchestration and deployment.

These strategies have allowed me to remain current with advances in infrastructure technology and best practices. As a result, I have been able to introduce new technologies into our infrastructure resulting in faster deployments and reduced system downtimes. For instance, in my previous role, I implemented the AWS CloudFormation to automate the setup of EC2 instances resulting in reducing setup time by 75% and increasing deployment consistency.

8. How do you ensure effective communication between application development teams, infrastructure teams, and other stakeholders?

Having worked in various teams with different members, including application development, infrastructure, and stakeholders, I have learned the importance of collaboration and communication. To ensure effective communication between these teams, there are several steps that I always take:

  1. Establishing a clear communication channel: This involves setting up regular meetings, either virtually or in-person, with all the teams involved. I find this helps to identify, discuss and resolve any issues that may arise. It also helps to keep everyone informed, organized, and accountable.
  2. Clarifying goals and expectations: It is vital to have a clear understanding of each team's goal and expectation to facilitate effective communication. I make sure we go over what each team needs and expects and that we have an agreement on how to deliver.
  3. Encouraging transparency: Building trust, being honest, and having clear communication protocols are necessary for effective teamwork. I make sure to encourage openness, transparency and dissuade any culture of blaming or finger-pointing.
  4. Emphasizing documentation: Documenting every meeting and discussion is essential to refer to what was discussed, agreed, or disagreed upon. Documentation ensures transparency and helps stakeholders and team members to have a common understanding of the application design and infrastructure.
  5. Utilizing project management tools: Utilizing project management software tools like Jira, Trello, or Asana makes communication and work easier. These tools provide an efficient way to assign tasks, coordinate workflows, and track progress. It is easier to communicate when everyone is aware of the job requirements, deadlines, and dependencies.

By following these steps, I have been able to maintain effective and efficient communication between application development teams, infrastructure teams, and other stakeholders, which has resulted in quicker problem resolution, better team cohesion, clearer goals, and more successful projects. For instance, in my last job, we reduced communication time between teams by 40%, and the projects we completed had 100% customer satisfaction from the feedback given.

9. What has been the most challenging application infrastructure project you have worked on so far and how did you overcome it?

During my time at ABC Company, I was the lead application infrastructure engineer for a project that aimed to migrate our entire infrastructure to the cloud. This was a significant challenge, as our existing infrastructure was spread out over multiple physical locations and had grown organically over time, resulting in a complex web of interconnected services and systems.

To overcome this challenge, I implemented a phased migration plan that included thorough testing and validation for each stage of the migration. We started by moving our development and staging environments to the cloud first, which allowed us to replicate our existing infrastructure in a controlled environment and uncover any potential issues. Once we had successfully migrated those environments, we proceeded with moving our production environment to the cloud.

In addition to the phased migration plan, I also worked closely with our development team to optimize our applications for cloud-based infrastructure. We implemented load balancing and auto-scaling capabilities to ensure our systems could handle spikes in traffic and usage, which helped us achieve better uptime and reduced latency for our users.

As a result, we were able to complete the migration project ahead of schedule and saw significant improvements in performance and reliability. Our uptime increased by 20% and we reduced infrastructure costs by nearly 30% due to greater efficiency and optimization in the cloud.

10. What are your thoughts on incorporating cloud technologies into application infrastructure design and deployment?

Cloud technologies have revolutionized the way we think about application infrastructure design and deployment. There are many benefits to incorporating cloud technologies, including:

  1. Scalability – With cloud-based infrastructure, applications can be quickly scaled up or down to meet demand. For example, when our team launched an e-commerce website, we were able to handle a sudden influx of traffic during holiday shopping season thanks to our cloud-based infrastructure.

  2. Flexibility – Cloud-based infrastructure allows us to quickly test and deploy new features and updates without disrupting service. This ensures a consistent experience for our users while allowing us to innovate and improve our application.

  3. Cost-Effectiveness – Using cloud infrastructure has allowed our team to reduce costs associated with traditional on-premises IT infrastructure. For example, we were able to reduce operational costs by 30% by migrating our database to a cloud-based solution.

Overall, I believe that incorporating cloud technologies into application infrastructure design and deployment is critical in today's fast-paced and dynamic technological landscape. I look forward to working with cutting-edge cloud-based technologies to provide the best possible user experience for our customers.


Congratulations on reading through these 10 Application Infrastructure Engineer interview questions and answers for 2023! Your next step is to make sure you have a killer cover letter to pair with your impressive CV. Don't forget to write a

compelling and personalized cover letter

that showcases your unique skills and experiences. It's also important to prepare a top-notch CV that highlights your achievements and expertise. Check out our

guide on writing a resume for infrastructure engineers

to get started. If you're on the lookout for a new job, be sure to check out Remote Rocketship's job board for remote infrastructure engineer positions. Browse through the available jobs and apply to the ones that best match your skills and interests.

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