Senior Systems Administrator (Linux/Windows) - Top Secret Clearance w/SCI eligibility required

American Systems • Arlington, VA

15h • $108,100 - $180,600 • Onsite

About The Position

At AMERICAN SYSTEMS , your technical expertise directly supports national security and mission-critical systems. As an employee-owned federal government contractor, we deliver trusted solutions in support of the nation’s highest priorities. We are seeking a Senior Systems Administrator to support a Special Access Program , operating in highly secure, complex environments where precision and reliability are essential. This role focuses on owning and optimizing enterprise Windows and Linux infrastructure across multiple datacenters, partnering with cybersecurity and engineering teams, and providing Tier III support for systems that cannot fail. THIS POSITION INC LUDES A $5,000 SIGN-ON BONUS!

Requirements

• Active TOP SECRET clearance with SCI eligibility required; Program Access Request (PAR) submission required after hire
• Bachelor’s degree in a STEM discipline (additional years of relevant experience considered in lieu of degree)
• 8-10 years of IT Systems Administration that includes 3-5 years of Linux administration
• DoD 8140 IAT Level II cert (e.g., Security+ CE or equivalent)
• Experience designing and maintaining secure, scalable cloud/on-prem platforms (IL5–IL6+)
• Knowledge of STIGs, RMF, and DoD cybersecurity standards
• Familiar with CLI and Bash scripting
• NOTE: U.S. Citizenship Required for the purposes of obtaining/holding a U.S. security clearance

Nice To Haves

• Knowledge of containerization (Docker/Podman), Ansible for automation, and OpenLDAP
• Experience with virtualization (VMware)

Responsibilities

• Support on-premises Windows (40%) and Linux (60%) infrastructure and applications.
• Support on-premises vSphere infrastructure across multiple datacenters.
• Provide Tier III support for production and development environments, managing ticket submission and tracking.
• Monitor resource availability to meet customer requirements, ensuring sufficient hardware, software, and throughput.
• Review and optimize system performance to ensure peak efficiency and reliability for mission-critical applications
• Analyze system resource usage and apply corrective actions when necessary
• Review system and application logs, ensuring completion of scheduled tasks and backups
• Create and manage user accounts, groups, and permissions; maintain local repositories in a Linux-based environment
• Support on-prem and remote Linux-based Oracle database appliances
• Develop and maintain administrative bash scripts for system maintenance and automation
• Proficient in DNS administration
• Document and implement system administration solutions to meet business requirements
• Provide project status updates, problem resolution, and system administration reports to management
• Coordinate problem resolution with customers, team members, and vendors as needed
• Assess and recommend improvements for system software and hardware to enhance efficiency and functionality
• Collaborate with the Cybersecurity team to implement, monitor, and maintain cybersecurity compliance and vulnerability mitigations

Benefits

• AMERICAN SYSTEMS provides for the welfare of its employees and their dependents through a comprehensive benefits program by offering healthcare benefits, paid leave, retirement plans, insurance programs, and education and training assistance.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior