Senior Systems Administrator

Senior Systems Administrator

Location: St. Louis, MO
Required Clearance: Active TS/SCI with Polygraph Eligibility
Employment Type: Full-Time Regular
Shift: Day
Travel: No
Relocation Assistance: Yes

Company Overview

We are Ennoble First. The people supporting and securing some of the most complex government, defense, and intelligence projects across the country. We ensure today is safe and tomorrow is smarter. Our work has meaning and impact on the world around us, but also on us, and that's important. Ennoble First is your place. You make it your own by embracing autonomy, seizing opportunity, and being trusted to deliver your best every day. We think. We act. We deliver. There is no challenge we can't turn into an opportunity.

Position Overview

Ennoble First is seeking a Senior Systems Administrator to support the National Geospatial-Intelligence Agency (NGA) in St. Louis, Missouri. In this mission-critical role, you will maintain and enhance enterprise applications while ensuring the reliability, security, and performance of systems that directly enable intelligence operations.

Working alongside engineers, cybersecurity professionals, and customer stakeholders, you will optimize enterprise infrastructure, support mission operations, and maintain the technologies that keep critical capabilities available to users across the enterprise.

This position is performed on-site at the customer location in St. Louis, Missouri.

Primary Responsibilities

• Administer, maintain, and support enterprise applications within the customer environment.

• 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 an on-call rotation and provide after-hours support when required.

• Interface directly with customers to address operational tasking and mission requirements.

Required Qualifications

• Bachelor's degree in Information Technology, Computer Science, Engineering, or related field and 8-12 years of prior relevant experience, or Master's degree 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.

• Security+ CE or higher DoD 8570/8140 certification.

• Active Top Secret/SCI clearance with the ability to successfully pass a Polygraph examination.

Preferred Qualifications

• Experience supporting NGA 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.

Pay Range

$125,000-$150,000

The Ennoble First 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.

Equal Employment Opportunity

Ennoble First is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to any characteristic protected by law.

E-Verify Participation

Ennoble First participates in E-Verify. Learn more at

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E-Verify is a registered trademark of the U.S. Department of Homeland Security. This business uses E-Verify in its hiring practices to achieve a lawful workforce.