Systems Administrator

Leidos is a FORTUNE 500 company bringing a mix of innovative technology and sector experience to customers in the national security engineering and health industries.

We are seeking a Secret cleared Systems Administrator to support Postproduction Software Support (PPSS) and Post Deployment Software Support (PDSS) engineering and technical services to the CECOM Software Engineering Center Mission Command Division with operations located at Ft. Sill / Lawton OK.

We are looking for an experienced Systems Administrator with expertise in VMware virtualization and Linux systems to join our system administrator team. You will be responsible for the daily administration patching troubleshooting and lifecycle management of our VMware vSphere and Linux environments.

Primary Responsibilities

Administer maintain and optimize VMware vSphere administration (ESXi vCenter) 8.x environments

Manage lifecycle of VMware infrastructure : upgrades patching and cluster maintenance

Perform day-to-day Linux systems administration on RHEL 8 / 9

Build deploy patch and harden Linux servers (physical and virtual) following STIG benchmarks and internal security standards

Automate repetitive tasks using Ansible

Perform capacity planning and performance analysis for both VMware and Linux environments

Create and maintain detailed documentation runbooks and standard operating procedures

Full lifecycle management of Red Hat Satellite Server

Basic Qualifications

Bachelors Degree in IT / Cybersecurity / Computer Science and up to 2 years of experience. Additional years of experience may be considered in lieu of a degree.

Active and current DoD Secret clearance .

Active CompTIA Certifications including Security.

Technical knowledge in one of the following areas : System Administration computer applications and security operations.

Experienced with VMware vCenter environments.

Expertise of Windows and Red Hat Linux environments.

Ability to develop cybersecurity documentation.

Ability to work at customer site in Ft Sill OK (no telework).

Preferred Qualifications

Familiarity with U.S. Army Field Artillery tactical systems or other DoD systems.

Familiarity with EMASS and the RMF Process.

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 : December 10 2025

For 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 $50700.00 - $91650.00

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.

Required Experience :

Unclear Seniority

Key Skills

Computer Science,Active Directory,Computer information Technology,PowerShell,OS,Windows,Database,SCCM,Linux,SAN,Troubleshoot,Backup,Setup,Technical Support,UNIX

Employment Type : Full-Time

Experience : years

Vacancy : 1

Monthly Salary Salary : 50700 - 91650