Senior Systems Administrator
Leidos
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Job summary
Leidos in St. Louis, MO is seeking a Senior Systems Administrator to join the Chinook Program supporting the Intelligence Community.
You will maintain and enhance Windows and Linux server environments, ensuring reliability, security, and performance of mission-critical systems used across development, test, and production environments. This role requires US citizenship, active Top Secret/SCI with poly, and hands-on experience with RMF/STIG, AD, VMware, and scripting.
Qualifications
- US citizenship is required per contract.
- Bachelor's degree in IT/CS/Engineering with 8–12 years of relevant experience or a Master's with 6–10 years of relevant experience.
- 8+ years of enterprise systems administration experience.
- Experience supporting mission-critical DoD or Intelligence Community environments.
- Strong administration experience with Windows Server, RHEL, VMware vSphere, Active Directory, DNS/DHCP, and Group Policy.
- Experience with scripting and automation using PowerShell, Bash, or Python.
- Experience implementing and maintaining STIG compliance.
- Knowledge of RMF security controls and vulnerability remediation.
- Strong troubleshooting and analytical skills.
- Security+ CE or higher DoD 8570/8140 certification.
Responsibilities
- Administer, maintain, and support the customer enterprise.
- Install, configure, patch, upgrade, and lifecycle manage Windows and Linux servers.
- Monitor system health, performance, and availability using enterprise tools.
- Troubleshoot hardware, software, OS, and application issues.
- Support deployment across development, test, staging, and production.
- Coordinate maintenance windows and orchestrate upgrades with minimal disruption.
- Develop automation scripts using PowerShell, Bash, or Python.
- Perform backup, recovery, and disaster recovery operations.
- Support accreditation activities and ensure RMF/STIG compliance.
- Manage user accounts, permissions, and AD integrations.
- Collaborate with security to remediate vulnerabilities and maintain compliance.
- Assist incident response, root cause analysis, and corrective actions.
- Document configurations and SOPs; maintain technical docs.
- Participate in on-call rotation and after-hours support.
- Interface with customer to address operational tasking.
Skills
Education
Tools
Job description
Are you passionate about solving complex technical challenges in support of national security? Leidos is seeking a Senior Systems Administrator to join our high-performing team on the Chinook Program, supporting our Intelligence Community customer. In this mission-critical role, you’ll be at the forefront of maintaining and enhancing the application ensuring the reliability, security, and performance of systems that directly enable intelligence operations.
Are you passionate about solving complex technical challenges in support of national security? Leidos is seeking a Senior Systems Administrator to join our high-performing team on the Chinook Program, supporting our Intelligence Community customer. In this mission-critical role, you’ll be at the forefront of maintaining and enhancing the application ensuring the reliability, security, and performance of systems that directly enable intelligence operations.
As a trusted technical expert, you’ll work alongside talented engineers, cybersecurity professionals, and customer stakeholders to deliver innovative solutions, optimize enterprise infrastructure, and keep mission-essential capabilities operating at peak performance. If you thrive in a fast-paced, collaborative environment where your expertise has a tangible impact, this is an opportunity to contribute to work that truly matters.
Position is performed at the customer site in St. Louis, MO.
Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.
- Administer, maintain, and support the application with the customer enterprise.
- Perform installation, configuration, patching, upgrades, and lifecycle management of Windows and Linux servers.
- Monitor system health, performance, and availability using enterprise monitoring tools.
- Troubleshoot complex hardware, software, operating system, and application issues.
- Support deployment activities across development, test, staging, and production environments.
- Coordinate scheduled maintenance windows and execute system upgrades with minimal operational impact.
- Develop and maintain automation scripts using PowerShell, Bash, or Python to improve operational efficiency.
- Perform backup, recovery, and disaster recovery operations.
- Support accreditation activities and ensure compliance with customer, DoD, RMF, DISA STIG, and security requirements.
- Manage user accounts, permissions, and Active Directory integrations.
- Collaborate with security teams to remediate vulnerabilities and maintain compliance.
- Support incident response, root cause analysis, and corrective action implementation.
- Document system configurations, standard operating procedures, and technical documentation.
- Participate in on-call rotation and provide after-hour support when required.
- Interface directly with customer to address operational tasking and mission requirements.
- US citizenship is required per contract.
- Bachelor's degree in Information Technology, Computer Science, Engineering, or related field and 8-12 years of prior relevant experience or Master's with 6-10 years of prior relevant experience.
- 8+ years of enterprise systems administration experience.
- Experience supporting mission-critical DoD or Intelligence Community environments.
- Strong administration experience with:
- Microsoft Windows Server
- Red Hat Enterprise Linux (RHEL)
- VMware vSphere
- Active Directory
- DNS/DHCP
- Group Policy
- Experience with scripting and automation using PowerShell, Bash, or Python.
- Experience implementing and maintaining STIG compliance.
- Knowledge of RMF security controls and vulnerability remediation.
- Strong troubleshooting and analytical skills.
- Must have a Security+ CE or higher DoD 8570/8140 certification
- Experience supporting customer mission systems.
- Experience supporting GEOINT applications.
- Experience with:
- Ansible
- VMware vCenter
- SCCM/MECM
- Splunk
- Elastic Stack
- Git
- ServiceNow
- Red Hat Certified Systems Administrator (RHCSA)
- Microsoft Certified: Windows Server Hybrid Administrator Associate
- ITIL Foundation Certification
#Chinook
#NSBA
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.
July 28, 2026
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 $92,300.00 - $166,850.00
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.
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 $16.7 billion for the fiscal year ended January 3, 2025. For more information, visit www.Leidos.com.
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 at www.leidos.com/careers/pay-benefits.
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.
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