Linux and Windows Systems Administrator
Job Location:
Beavercreek, OH - USA
Monthly Salary:
Posted on:
Vacancies:
Job Summary
Leidos Corporate Information Security Office (CISO) reporting through the Digital sector is seeking a Linux and Windows System Administrator to support and maintain complex classified environments. The selected candidate will be responsible for administering securing troubleshooting and maintaining Windows and Linux systems across physical and virtual infrastructures. This role supports mission-critical operations by ensuring system availability compliance with security requirements and reliable day-to-day operations within a secure enterprise environment.
Location: All work will be performed onsite in our Beavercreek OH office.
Clearance: You must currently carry an active DoD Secret clearance to qualify for consideration.
Primary Responsibilities
Administer and maintain Windows Workstations Windows Server and Linux systems(RHEL Rocky Linux Ubuntu) across physical virtual and air-gapped environments.
Perform Tier 2incident resolution troubleshoot technical issues conduct root-cause analysis and collaborate with engineering cybersecurity and stakeholders to resolve complex problems.
Execute system patching vulnerability remediation configuration management and compliance activities.
Implement and maintain monitoring logging backup and recovery solutions and operational documentation/runbooks.
Support account and access administration in accordance with least-privilege principles and organizational security policies.
Automate repetitive administrative tasks using PowerShell Bash Ansible or similar automation tools.
Deploy and maintain operating system images using PXE/network boot Kickstart disk imaging answer files and automated installation methods.
Perform system hardening and security compliance using DISA STIGs SCAP and NIST 800-53security controls.
Administer and troubleshoot Active Directory DNS DHCP file servers virtualization platforms and Layer 2 network switching including VLAN configuration TCP/IP connectivity and switch port administration in an air-gapped environment.
Support dual-boot bare-metal systems and virtualized environments.
Participate in after-hours support and on-call rotations as required.
Research analyze and resolve Windows Linux and networkingissues to maintain system availability reliability and performance.
Basic Qualifications
Current Active DoD Secretsecurity clearance.
Current CompTIA Securitycertification.
Bachelors degree in a technical field with 24 years of relevant experience. Additional years of experience may be considered in lieu of a degree.
Experience administering Windows Serverand Linuxsystems in secure or air-gapped environments.
Experience implementing DISA STIGs SCAP NIST 800-53security controls and system hardening practices.
Experience administering:
Active Directory
DNS
DHCP
File Servers
Experience building integrating maintaining troubleshooting and remediating Windows and Linux systems.
Experience deploying operating systems using PXE Kickstart ISO/disk imaging and automated installation methods.
Experience configuring and troubleshooting Layer 2 switching VLANs TCP/IP and network connectivity.
Experience managing Windows and Linux updates patching and vulnerability remediation.
Ability to develop automation scripts using PowerShelland Bash.
Familiarity with Linux software repository management.
Ability to work independently and collaboratively with minimal supervision.
Strong analytical communication and problem-solving skills.
Preferred Qualifications
Red Hat Certified System Administrator (RHCSA)certification.
Experience administering VMware Hyper-V or other virtualized environments.
Experience with automation and configuration management tools including Ansible.
Experience supporting secure or classified DoD environments.
Knowledge of backup recovery logging and monitoring solutions.
Experience performing DISA STIGremediation SCAPcompliance validation and vulnerability scanning using Tenable Nessus.
If youre looking for comfort keep scrolling. At Leidos we outthink outbuild and outpace the status quo because the mission demands it. Were not hiring followers. Were recruiting the ones who disrupt provoke and refuse to fail. Step 10 is ancient history. Were already at step 30 and moving faster than anyone else dares.
Original Posting:
July 2 2026For U.S. Positions: While subject to change based on business needs Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.
Pay Range:
Pay Range $69550.00 - $125725.00The Leidos pay range for this job level is a general guideline onlyand not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job education experience knowledge skills and abilities as well as internal equity alignment with market data applicable bargaining agreement (if any) or other law.
Required Experience:
Unclear Seniority
About Company
Leidos is an innovation company rapidly addressing the world's most vexing challenges in national security and health. Our 47,000 employees collaborate to create smarter technology solutions for customers in these critical markets.
