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.
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.
Clearance Level Required:Active Top Secret/SCI with the ability to successfully pass a Polygraph examination.
Primary Responsibilities:
- 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.
Basic Qualifications:
- 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
Preferred Qualifications:
- 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.
Original Posting:July 28, 2026For 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.
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.
Skills Required
- US citizenship is required per contract.
- Active Top Secret/SCI clearance with ability to pass a polygraph examination.
- Bachelor's degree in Information Technology, Computer Science, Engineering, or related field and 8-12 years relevant experience, or Master's with 6-10 years relevant experience.
- 8+ years of enterprise systems administration experience.
- Experience supporting mission-critical DoD or Intelligence Community environments.
- Administration experience with Microsoft Windows Server.
- Administration experience with Red Hat Enterprise Linux (RHEL).
- Experience with VMware vSphere.
- Experience with Active Directory, DNS, DHCP, and Group Policy.
- Scripting and automation using PowerShell, Bash, or Python.
- Experience implementing and maintaining DISA STIG compliance.
- Knowledge of RMF security controls and vulnerability remediation.
- Strong troubleshooting and analytical skills.
- Must have Security+ CE or higher DoD 8570/8140 certification.
- Experience supporting customer mission systems.
- Experience supporting GEOINT applications.
- Experience with Ansible.
- Experience with VMware vCenter.
- Experience with SCCM/MECM.
- Experience with Splunk.
- Experience with Elastic Stack.
- Experience with Git.
- Experience with ServiceNow.
- Red Hat Certified Systems Administrator (RHCSA).
- Microsoft Certified: Windows Server Hybrid Administrator Associate.
- ITIL Foundation Certification.
Leidos Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Leidos and has not been reviewed or approved by Leidos.
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Healthcare Strength — Healthcare coverage is described as comprehensive, with multiple plan options, low office-visit copays in some plans, and access to mental health and wellness support tools. The availability of HSA/FSA options and employer contributions is positioned as a meaningful part of the total package.
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Retirement Support — Retirement benefits are framed as a strong component of total rewards, highlighted by a 401(k) match and immediate vesting in the standard package. The Employee Stock Purchase Plan is also presented as an additional long-term wealth-building feature.
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Wellbeing & Lifestyle Benefits — Wellbeing and lifestyle supports extend beyond core insurance, including wellness programs, fitness-related stipends, and assistance resources. Work flexibility and related perks are also included as part of the broader rewards experience.
Leidos Insights
What We Do
We Are Leidos For 50 years we have been tackling some of the biggest problems that face our nation and our world. OUR MISSION Through our culture of innovation and history of performance, we develop deep customer trust built on integrity and create enduring solutions that improve our world. Leidos is a science and technology solutions leader working to address some of the world’s toughest challenges in the defense, intelligence, homeland security, civil, and healthcare markets. The company’s 43,000 employees support vital missions for government and commercial customers. Headquartered in Reston, Va., Leidos reported annual revenues of approximately $11.09 billion for the fiscal year ended January 3, 2020. Leidos was cited for the meaningful work employees perform that is challenging, impactful, and aligned with our customers’ missions as reasons professionals want to work and stay at our company. Leidos has also been named to lists including Forbes’ Best Employers for Diversity, Forbes’ America’s Best Employers for Women, Military Times Best for Vets Employers, and Ethisphere Institute’s World's Most Ethical Companies®. Employees enjoy career enrichment opportunities available through mobility and development and experience rewarding relationships with supportive supervisors and talented colleagues and customers. Employees appreciate our flexible work environment, allowing for and encouraging a true work-life balance. Our professionals are also excited about our Employee Resource Groups, like the newly launched Collaborative Outreach with Remote and Embedded Employees (CORE), which strives to create an environment where every employee, regardless of location, feels fully engaged as a valued employee of Leidos. Your most important work is ahead.
