Classified Systems Administrator
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Classified Systems Administrator at STR, Arlington, VA. Pay posted by the employer: $105k–125k/yr. Posted Sep 18, 2026, last seen on the employer's hiring page Nov 5, 2026. Mentioned in the posting: Clearance required.
STR is hiring a Systems Administrator with an Top Secret/SCI with polygraph clearance. Help power the infrastructure behind cutting-edge defense research. At STR, our Information Technology team plays a critical role in enabling the research and development that supports our national security...
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STR is hiring a Systems Administrator with an Top Secret/SCI with polygraph clearance. Help power the infrastructure behind cutting-edge defense research.
At STR, our Information Technology team plays a critical role in enabling the research and development that supports our national security mission. The team brings together experts across Enterprise IT, Classified IT, and Cybersecurity to build and maintain the secure, reliable infrastructure that powers our organization.
Our Enterprise IT team ensures the performance and availability of the systems that support day-to-day operations, while our Classified IT team manages highly secure environments that protect sensitive government information. Working alongside them, our Cybersecurity team proactively defends our networks and systems against evolving threats. Together, these teams provide the technology foundation that enables STR’s engineers and researchers to develop innovative solutions for national defense.
The Role:
We are seeking a Systems Administrator with an active Secret or Top Secret clearance to support our senior administrators in implementing, deploying, and maintaining Linux (Red Hat, Ubuntu) and Windows operating systems in traditional and virtualized environments across a variety of hardware solutions.
If you enjoy solving complex infrastructure challenges, improving system reliability, and working in a mission-driven environment, we’d love to hear from you. Please note: this position is based in Arlington, VA only (no other sites, no remote).
What you will Do:
- Professionally support senior administrators, Information System Security Officers (ISSO), management, researchers and others supporting the customers
- Configure and maintain NAS Storage, Networking, Firewall, and Directory Services such as MS Active Directory management and Group Policy administration
- Perform performance monitoring, results analysis and enhancement, as well as process automation using PowerShell scripting and other available technologies
- Provide daily support, systems maintenance, problem resolution, tracing and project support
- Create and maintain installation and configuration Standard Operating Procedures (SOPs)
- Maintain current knowledge of DoD security and technical guidelines and the organization's policies
- Provide support for production and development environments
- After-hours support is required for maintenance and patching when needed
Who you Are:
- This position requires an active Top Secret/SCI with polygraph clearance, for which U.S. citizenship is needed by U.S. Government
- Linux Administration (Red Hat, Ubuntu)
- Windows OS Administration
Nice to Haves:
- Enterprise Virtualization Tools
- Multi-Factor Authentication
- Public Key Infrastructure
- Web Server
- Active Directory including Group Policy, LDAP backend, and Replication
- Effective utilization of Security Technical Implementation Guidelines (STIGS) and Security Content Automation Protocol (SCAP) Content and Tools
- Host Based Security System (HBSS) implementation and maintenance
- Assured Compliance Assessment Solution (ACAS) support
- Current knowledge of DoD Ports, Protocols, and Services (PPS)
Education:
Bachelor’s degree + 5 years of experience or Master’s degree + 3 years of experience or PhD or equivalent experience.
Pay Information
Full-Time Salary Range: $105,000 to $125,000
The salary range listed is based on external market data. Offers are based on factors, such as but not limited to, the candidate’s experience, education, training, key skills/critical skills, security clearances, and prevailing market and business conditions.
STR is a growing technology company with locations near Boston, MA, Arlington, VA, near Dayton, OH, Melbourne, FL, Carlsbad, CA, Atlanta, GA, and Denver, CO. We specialize in advanced research and development for defense, intelligence, and national security in: cyber; next generation sensors, radar, sonar, communications, and electronic warfare; and artificial intelligence algorithms and analytics to make sense of the complexity that is exploding around us.
STR is committed to creating a collaborative learning environment that supports deep technical understanding and recognizes the contributions and achievements of all team members. Our work is challenging, and we go home at night knowing that we pushed the envelope of technology and made the world safer.
STR is not just any company. Our people, culture, and attitude along with their unique set of skills, experiences, and perspectives put us on a trajectory to change the world. We can't do it alone, though - we need fellow trailblazers. If you are one, join our team and help to keep our society safe! Visit us at www.str.us for more info.
STR is an equal opportunity employer. We are fully dedicated to hiring the most qualified candidate regardless of race, color, religion, sex (including gender identity, sexual orientation and pregnancy), marital status, national origin, age, veteran status, disability, genetic information or any other characteristic protected by federal, state or local laws.
If you need a reasonable accommodation for any portion of the employment process, email us at appassist@str.us and provide your contact info.
Pursuant to applicable federal law and regulations, positions at STR require employees to obtain national security clearances and satisfy the requirements for compliance with export control and other applicable laws.
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