Systems Administrator/ AWS Cloud Engineer/ Linux Engineer - Expe with Security Clearance

June 6, 2026

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Title: Systems Administrator/AWS Cloud Engineer/ Linux Engineer - Expert Location: Warrenton, Virginia<br><br><ul><li>Clearance:</li><li>Active TS/SCI w/ Polygraph needed to apply</li><li>Company Overview: Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government. Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission. Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation's toughest and most secure problems. If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don't look any further than Cornerstone Defense. Cornerstone Defense is expanding our System Administration team. We are seeking a highly skilled System Administrator/Cloud Engineer to enhance our existing technical team supporting the advancement of AI/ML/Data Science technologies in Warrenton, VA. The successful candidate will be a self-motivated, innovative, cloud engineer to join in and contribute to a team environment. The candidate will be part of a team that supports the cloud infrastructure for an enterprise environment. This position requires a broad knowledge of system administration, knowledge of automation technologies, and scripting. This position also requires a knowledge of security and accreditation practices and procedures the ability to work with several enterprise resources and teams in the operation of an enterprise digitization infrastructure. Mandatory:</li><li>Must have hands-on experience with AWS and Linux in a production environment.</li><li>Experience patching and maintaining systems databases, to include RDS, MySQL, and Oracle</li><li>Proven experience troubleshooting and solving technical problems</li><li>Knowledge of Federated Identity, RBAC, authentication & authorization solution, etc.</li><li>Understanding of secure-cloud configuration, (e.g., CloudTrail, AWS Config), cloud-security technologies (e.g., VPC, Security Groups) and Access Control (IAM).</li><li>Experience with configuration management (e.g., Puppet, Chef, Ansible, CloudFormation, etc.)</li><li>Experience with security, such as NGFW, WAF, SIEM, endpoint security.</li><li>Ability to work in a fast-paced agile environment</li><li>Bachelors Degree in IT related field or equivalency in related work experience</li><li>Demonstrated on-the-job experience working and solving technical problems independently as a system administrator.</li><li>Experience using a scripting language.</li><li>Demonstrated ability to monitor and troubleshoot enterprise workflow applications, to include: installing, starting, and stopping background, processes, analyzing log and event files, and patching and troubleshooting.</li><li>Demonstrated ability creating and managing a virtual infrastructure, such as AWS, Azure, Hyper-V, or VMWare. Optional:</li><li>Experience with an enterprise application development language, such as Python, Java, or C#, to include writing simple applications or modifying existing ones.</li></ul>

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Common Interview Questions And Answers

1. HOW DO YOU PLAN YOUR DAY?

This is what this question poses: When do you focus and start working seriously? What are the hours you work optimally? Are you a night owl? A morning bird? Remote teams can be made up of people working on different shifts and around the world, so you won't necessarily be stuck in the 9-5 schedule if it's not for you...

2. HOW DO YOU USE THE DIFFERENT COMMUNICATION TOOLS IN DIFFERENT SITUATIONS?

When you're working on a remote team, there's no way to chat in the hallway between meetings or catch up on the latest project during an office carpool. Therefore, virtual communication will be absolutely essential to get your work done...

3. WHAT IS "WORKING REMOTE" REALLY FOR YOU?

Many people want to work remotely because of the flexibility it allows. You can work anywhere and at any time of the day...

4. WHAT DO YOU NEED IN YOUR PHYSICAL WORKSPACE TO SUCCEED IN YOUR WORK?

With this question, companies are looking to see what equipment they may need to provide you with and to verify how aware you are of what remote working could mean for you physically and logistically...

5. HOW DO YOU PROCESS INFORMATION?

Several years ago, I was working in a team to plan a big event. My supervisor made us all work as a team before the big day. One of our activities has been to find out how each of us processes information...

6. HOW DO YOU MANAGE THE CALENDAR AND THE PROGRAM? WHICH APPLICATIONS / SYSTEM DO YOU USE?

Or you may receive even more specific questions, such as: What's on your calendar? Do you plan blocks of time to do certain types of work? Do you have an open calendar that everyone can see?...

7. HOW DO YOU ORGANIZE FILES, LINKS, AND TABS ON YOUR COMPUTER?

Just like your schedule, how you track files and other information is very important. After all, everything is digital!...

8. HOW TO PRIORITIZE WORK?

The day I watched Marie Forleo's film separating the important from the urgent, my life changed. Not all remote jobs start fast, but most of them are...

9. HOW DO YOU PREPARE FOR A MEETING AND PREPARE A MEETING? WHAT DO YOU SEE HAPPENING DURING THE MEETING?

Just as communication is essential when working remotely, so is organization. Because you won't have those opportunities in the elevator or a casual conversation in the lunchroom, you should take advantage of the little time you have in a video or phone conference...

10. HOW DO YOU USE TECHNOLOGY ON A DAILY BASIS, IN YOUR WORK AND FOR YOUR PLEASURE?

This is a great question because it shows your comfort level with technology, which is very important for a remote worker because you will be working with technology over time...