Senior Associate, Cyber Infrastructure Systems Engineer – Systems Administrator

L3Harris Technologies

. Administer, maintain, and support Windows-based servers and workstations within a cleared enterprise or mission-critical DoD environment .

Posted 10/23/2026full-timeColorado Springs • Colorado • United StatesSenior💰 $70,500 - $130,500 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in administering and maintaining Windows-based servers and workstations within a cleared DoD environment, with a strong focus on security compliance, vulnerability management, and system performance monitoring.

Highest-signal resume keywords

Windows-Based Server AdministrationDoD Security Standards KnowledgeVulnerability Identification and RemediationSecret ClearanceDoD 8570.01-M IAT Level 2 Certification

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Operating System PatchesSecurity UpdatesHotfixesSystem HardeningConfiguration ManagementTroubleshooting Hardware IssuesTroubleshooting Software IssuesTroubleshooting Operating System IssuesAccess-Related Issue ResolutionAudit Readiness

Tools & Technologies

KVMVMwareVSphereVCenterOpenShiftDocker

Certifications & Qualifications

CCNA-SecuritySecurity+ CE

Industry Keywords

DoD EnvironmentSTIGsRMF ControlsPOA&M TrackingCOMSEC Management

Tech Stack

Tools & technologies

Cyber SecurityDockerLinuxOpenShiftVMware

About the role

Key responsibilities & impact

Administer, maintain, and support Windows-based servers and workstations within a cleared enterprise or mission-critical DoD environment
Manage deployment of operating system patches, security updates, and hotfixes according to approved schedules and security requirements
Implement and sustain system hardening measures using DoD security standards, STIGs, and organizational cybersecurity policies
Perform vulnerability identification and remediation to support RMF controls, POA&M tracking, and audit readiness
Monitor system performance, availability, and operational health
Troubleshoot and resolve hardware, software, operating system, and access-related issues
Maintain system configurations, change records, and technical documentation for configuration management and compliance inspections
Coordinate with cybersecurity, network, and program teams on accreditation activities, incident response, and secure operations in classified or controlled environments

Requirements

What you’ll need

Bachelor’s Degree and a minimum of 2 years of prior related experience
Graduate Degree or equivalent with 0 to 2 years of prior related experience
In lieu of a degree, minimum of 6 years of prior related experience
Secret Clearance
DoD 8570.01-M IAT Level 2 required professional certification: CCNA-Security, Security+ CE, or higher certification
Experience administering Windows-based servers and workstations in a cleared enterprise or mission-critical DoD environment
Experience with operating system patches, security updates, and hotfixes
Knowledge of DoD security standards, STIGs, and organizational cybersecurity policies
Experience with vulnerability identification and remediation, RMF controls, POA&M tracking, and audit readiness
Experience troubleshooting hardware, software, operating system, and access-related issues
Preferred: DoD COMSEC Manager or COMSEC account management experience
Preferred: Red Hat Enterprise Linux (RHEL) administration and support experience
Preferred: KVM, VMware, vSphere/vCenter, OpenShift, and Docker experience

Benefits

Comp & perks

Health and disability insurance
401(k) match
Flexible spending accounts
Employee Assistance Program (EAP)
Education assistance
Parental leave
Paid time off
Company-paid holidays