Linux and Windows Systems Administrator

Leidos Inc; Beavercreek (OH); On-site; USD 69,550 - 125,725; Full time

Benefits offered by this job

Health and Wellness programs

Paid Leave

Retirement benefits

Job summary

Leidos Inc in Beavercreek, OH is seeking a Linux and Windows System Administrator to maintain complex classified environments. The role involves administering and securing systems, ensuring availability, and collaborating on technical resolutions.

Qualified candidates will hold a DoD Secret clearance and possess expertise in Windows and Linux administration in secure setups. Competitive salaries and benefits are provided as per consistent industry benchmarks.

Qualifications

• Current Active DoD Secret security clearance.
• Bachelors degree in a technical field with 2-4 years of relevant experience.
• Experience administering Windows and Linux systems in secure environments.

Responsibilities

• Administer and maintain Windows and Linux systems across infrastructures.
• Perform Tier 2 incident resolution and troubleshoot technical issues.
• Execute system patching and compliance activities.

Skills

Windows Administration

Linux Administration

Active Directory

Troubleshooting

PowerShell

Security Compliance

VLAN Configuration

Education

Bachelor's degree in technical field

Tools

Ansible

VMware

Tenable Nessus

Job description

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 2‑4 years of relevant experience. Additional years of 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.

Pay and Benefits

Pay range: $69,550.00 – $125,725.00. The Leidos pay range for this job level is a general guideline only and is not a guarantee of compensation.

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

Commitment to Non-Discrimination

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.