Linux and Windows System Administrator

Leidos Corporate Information Security Office (CISO) reporting through the Digital Modernization 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 Workstation/Server and Linux systems (RHEL Rocky Linux Ubuntu) in physical and virtual environments.

Perform Tier 3 incident resolution root-cause analysis and coordinate with engineering cybersecurity and stakeholders to drive issues to closure.

Execute system patching vulnerability remediation configuration management and compliance activities.

Implement and maintain monitoring logging backup/restore solutions and operational documentation/runbooks.

Support account and access administration processes in accordance with least privilege and security policy requirements.

Automate repeatable administrative tasks using PowerShell Bash Ansible or similar automation tools.

Deploy and maintain operating system images through PXE/network boot disk imaging and automated installation methods using answer files/scripts.

Perform system hardening activities aligned with NIST 800-53 security controls.

Administer and troubleshoot Active Directory DNS DHCP file servers virtualization platforms and networking/switch infrastructure.

Support dual-boot bare metal configurations with virtualized environments.

Participate in after-hours support and on-call rotations as required.

Conduct research and analysis necessary to resolve complex technical problems.

Basic Qualifications

Current Active DoD SECRET clearance.

Security certification required.

Bachelor of Science degree in a technical field with 4 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 an enterprise environment.

Experience implementing NIST 800-53 control families and system hardening practices.

Experience administering core infrastructure services including:

• Active Directory

• DNS

• DHCP

• File Servers

Experience with systems build integration maintenance troubleshooting and vulnerability remediation.

Experience deploying operating system images using kickstart iso/disk imaging and automated installation methods.

Experience with virtualization technologies and basic networking/switch administration.

Strong troubleshooting skills involving operating systems services permissions performance and networking fundamentals.

Experience with Windows and Linux patch management and operating system updates.

Ability to create Linux and PowerShell scripts to automate repetitive tasks.

Familiarity with software repository management.

Ability to work independently and collaboratively with minimal supervision.

Strong analytical communication and problem-solving skills.

Preferred Qualifications

• RedHat Certified System Administrator (RHCSA) certification.

• Experience working with virtual environments.

• Familiarity with automation/configuration management tools such as Ansible.

• Experience supporting secure or classified environments.

• Knowledge of backup recovery logging and enterprise monitoring solutions.

• Experience with STIG compliance and vulnerability scanning tools.

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:

Pay Range:

The 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.