Sr. Linux Systems Engineer

Company: CACI
Location: Sterling
Posted on: April 6, 2026

Job Description:

Job Title: Sr. Linux Systems Engineer Job Category: Information Technology Time Type: Full time Minimum Clearance Required to Start: TS/SCI with Polygraph Employee Type: Regular Percentage of Travel Required: Up to 10% Type of Travel: Continental US * * * The Opportunity: CACI is looking for a Senior Linux Administrator - DoD Environment to join our team . The ideal candidate will be a self-starter with extensive experience in Linux systems administration, automation, security implementations, and integration with enterprise directory services. This position requires a current SCI clearance with polygraph. Responsibilities: Install, configure, and maintain Linux operating systems on both physical and virtual environments using kickstarts Develop and maintain infrastructure as code using Puppet and Ansible • Implement and maintain security configurations following Department of Defense (DoD) Security Technical Implementation Guides (STIGs) • Proactively troubleshoot complex Linux-related issues and implement solutions • Manage user access and authentication using Centrify and Active Directory • Ensure compliance with DoD security policies and procedures • Take initiative in improving systems, processes, and security measures • Collaborate with other IT teams to maintain system reliability and security in a classified environment • Qualifications: Required: Active: TS/SCI with Polygraph Bachelor's degree in computer science, Information Technology, or related field experience Current Security certification 5 years of experience as a Linux Systems Administrator in a DoD or similar secure environment Proven experience installing and configuring Linux on physical servers and virtual machines Strong knowledge of Puppet and Ansible for configuration management and automation Active Directory integration Familiarity with Active Directory and LDAP Demonstrated ability to work independently and take initiative Excellent troubleshooting skills for Linux systems and applications Experience implementing and maintaining security configurations based on DoD STIGs Experience with Centrify for Linux Desired: Additional relevant certifications (e.g., RHCE, LFCS, CISSP) Experience with network devices (routers, switches, firewalls) and cabling Knowledge of FISMA, NIST, and other security frameworks Experience with cloud platforms (AWS, Azure, or GCP) in classified environments Scripting skills in Bash, Python, or Perl Scripting skill - What You Can Expect: A culture of integrity. At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation. An environment of trust. CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you need through a unique flexible time off benefit and have access to robust learning resources to make your ambitions a reality. A focus on continuous growth. Together, we will advance our nation's most critical missions, build on our lengthy track record of business success, and find opportunities to break new ground — in your career and in our legacy. Pay Range : There are a host of factors that can influence final salary including, but not limited to, geographic location, Federal Government contract labor categories and contract wage rates, relevant prior work experience, specific skills and competencies, education, and certifications. Our employees value the flexibility at CACI that allows them to balance quality work and their personal lives. We offer competitive compensation, benefits and learning and development opportunities. Our broad and competitive mix of benefits options is designed to support and protect employees and their families. At CACI, you will receive comprehensive benefits such as; healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits. The proposed salary range for this position is: $103,800 - $218,100 CACI is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, pregnancy, sexual orientation, age, national origin, disability, status as a protected veteran, or any other protected characteristic.

Keywords: CACI, Washington DC , Sr. Linux Systems Engineer, IT / Software / Systems , Sterling, DC