Top 13 Senior systems administrator Jobs in St. Louis Mo 63123

Senior Systems Administrator
Leidos —St. Louis, MO
- $92,300 - $166,850 a year
- Full-time
- 6 years
- Computer Science
- Master's degree
Mobile Device Systems Administrator Senior
General Dynamics Information Technology —St. Louis, MO
- $129,813 - $138,000 a year
- System design
- Bachelor's degree
- Experience equivalent to degree accepted
- Paid time off
- 401(k) matching
SENIOR SYSTEMS ENGINEER - INFORMATION TECHNOLOGY - FT DAYS
ANDERSON HOSPITAL —Maryville, IL
- Weekends as needed
- Computer Science
- Hospital
- Mid-level
Senior Systems Engineer (Windows/AWS)
aqua IT —St. Louis, MO
- Full-time
- Computer Science
- 8 years
- AWS
Quick Apply
Senior Systems Engineer - Site Reliability Engineering
Enterprise Mobility —St. Louis, MO
- Full-time
- Computer Science
- System design
- Research
- Profit sharing
- Health insurance
Sr. Systems Administrator
Chenega Agile Real-Time Solutions —St. Louis, MO
- Weekends as needed
- Microsoft Excel
- 6 years
- Computer Science
10d
Senior System Engineer – ArcGIS (Mission-Focused)
Esri —St. Louis, MO
- $156,000 - $239,200 a year
- Computer Science
- System design
- 11+ years
- Relocation assistance
Sr Engineer
Advantage Solutions —St. Louis, MO
- $72,700 - $121,000 a year
- Full-time
- Computer science
- Computer Science
- 3 years
13d
Sr. Systems Engineer – SQL Database Administrator.
U.S. Bank National Association —Earth City, MO
- $105,400 - $124,000 a year
- Full-time
- Azure
- 5 years
- System design
- Paid holidays
- Disability insurance
5d
Senior Systems & Network Engineer
Forward Slash Technology —St. Louis, MO
- Full-time
- Background check
- Clean driving record
- Azure
Quick Apply
Sr. System Engineer- ArcGIS
Esri —St. Louis, MO
- $156,000 - $239,200 a year
- Computer Science
- System design
- 11+ years
- Relocation assistance

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Senior Systems Administrator

Leidos -
St. Louis, MO

Apply Now

Job Details

Full-time
$92,300 - $166,850 a year

Qualifications

Government information & network security
Accreditation standards (regulatory compliance area)
IT user and group management
Linux support
GPO
Enterprise software
DoD experience
Security compliance frameworks implementation
DHCP
DoD 8570
DNS
Vulnerability management
RMF
Automation tools
Intelligence community

Full Job Description

Description

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, 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:

Pay Range $92,300.00 - $166,850.00

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.

About Leidos

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

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.

Securing Your Data

Beware of fake employment opportunities using Leidos’ name. Leidos will never ask you to provide payment-related information during any part of the employment application process (i.e., ask you for money), nor will Leidos ever advance money as part of the hiring process (i.e., send you a check or money order before doing any work). Further, Leidos will only communicate with you through emails that are generated by the Leidos.com automated system – never from free commercial services (e.g., Gmail, Yahoo, Hotmail) or via WhatsApp, Telegram, etc. If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at [email protected].

If you believe you are the victim of a scam, contact your local law enforcement and report the incident to the U.S. Federal Trade Commission.

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.

Apply Now

Refine Your Search

senior systems administrator jobs in st. louis mo 63123

Senior Systems Administrator

Mobile Device Systems Administrator Senior

SENIOR SYSTEMS ENGINEER - INFORMATION TECHNOLOGY - FT DAYS

Senior Systems Engineer (Windows/AWS)

Senior Systems Engineer - Site Reliability Engineering

Sr. Systems Administrator

Senior System Engineer – ArcGIS (Mission-Focused)

Sr Engineer

Sr. Systems Engineer – SQL Database Administrator.

Senior Systems & Network Engineer

Sr. System Engineer- ArcGIS

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