Linux and Windows Systems Administrator

Leidos LLC; Beavercreek (OH); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos seeks a Linux and Windows System Administrator to support classified environments in our Beavercreek, OH office. You will administer, secure, troubleshoot, and maintain Windows and Linux systems across physical and virtual infrastructures, ensuring availability and compliance with security controls.

Responsibilities include patching, incident resolution, automation scripting with PowerShell and Bash, and DISA STIG/NIST 800-53 compliance in air-gapped networks.

Qualifications

• Active DoD Secret clearance required.
• Bachelor's degree in a technical field with 4–8 years of relevant experience.
• Experience administering Windows Server and Linux systems in secure or air‑gapped environments.
• Experience implementing DISA STIGs, SCAP, and NIST 800‑53 controls.
• Experience administering AD, DNS, DHCP, and file servers.
• Experience building, integrating, maintaining, and remediating Windows and Linux systems.
• Experience deploying OS using PXE, Kickstart, ISO/disk imaging, and automated installation.
• Experience configuring Layer 2 switching, VLANs, TCP/IP, and network connectivity.
• Experience managing Windows and Linux updates, patching, vulnerability remediation.
• Ability to develop automation scripts using PowerShell and Bash.
• Familiarity with Linux software repository management.
• Ability to work independently and collaboratively.

Responsibilities

• Administer Windows and Linux systems across physical, virtual, and air-gapped environments.
• Perform Tier 2 incident resolution and root-cause analysis with cross-functional teams.
• Execute system patching, vulnerability remediation, and configuration management.
• Implement monitoring, logging, backup, and recovery solutions.
• Support account and access administration following least-privilege policies.
• Develop automation scripts using PowerShell and Bash.
• Deploy OS images using PXE, Kickstart, and automated install methods.
• Hardening and compliance using DISA STIGs, SCAP, and NIST 800-53.

Skills

Windows administration

Linux administration

Automation scripting

Security/compliance

Troubleshooting

Incident response

Team collaboration

Education

Bachelor's degree in a technical field

Tools

PowerShell

Bash

Ansible

PXE/Kickstart imaging

Active Directory

VMware/Hyper-V

SCAP/Nessus

DISA STIGs

Job description

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 2 incident 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 800‑53 security 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 networking issues to maintain system availability, reliability, and performance.

Basic Qualifications

• Current Active DoD Secret security clearance.
• Current CompTIA Security+ certification.
• Bachelor's degree in a technical field with 4‑8 years of relevant experience.
• Additional years of relevant experience may be considered in lieu of a degree.
• Experience administering Windows Server and Linux systems in secure or air‑gapped environments.
• Experience implementing DISA STIGs, SCAP, NIST 800‑53 security 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 PowerShell and 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 STIG remediation, SCAP compliance validation, and vulnerability scanning using Tenable Nessus.
• If you're looking for comfort, keep scrolling.
• At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it.
• We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail.
• Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Pay Range $87,100.00 - $157,450.00

The Leidos pay range for this job level is a general guideline only and 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.

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2billion for the fiscal year ended January2,2026. For more information, visit www.Leidos.com.

Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers.

Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement.

More details are available here.

Leidos will never ask you to provide payment‑related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment‑related information or any other personal information, please report the email to [e-mail].

All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.