Systems Administrator, Senior (Linux/Windows)

AMERICAN SYSTEMS•Arlington, VA

23h•Onsite

About The Position

AMERICAN SYSTEMS, a 100% employee-owned federal contracting company, is seeking a Senior Systems Administrator with Linux and Windows administration experience 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 Linux & Windows infrastructure across multiple datacenters, partnering with cybersecurity and engineering teams, and providing Tier III support for systems that cannot fail. Role includes a $5,000 sign-on bonus in addition to a generous compensation package!

Requirements

Active TOP SECRET clearance with SCI eligibility required; Program Access Request (PAR) submission required after hire
Bachelor’s degree in a STEM discipline (or 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
Knowledge of containerization (Docker/Podman), Ansible for automation, and OpenLDAP
Experience with virtualization (VMware)
Familiar with CLI and Bash scripting
U.S. Citizenship Required for the purposes of obtaining/holding a U.S. security clearance

Responsibilities

Support on-premises Linux (60%) and Windows (40%) 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