Specialist, Cyber Infrastructure Systems Engineer – Systems Administrator

L3Harris Technologies

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

Posted 9/23/2026full-timeColorado Springs • Colorado • United StatesSeniorLead💰 $80,500 - $149,500 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in administering and maintaining Windows-based servers and workstations in a DoD environment, with a strong focus on security compliance, system hardening, and vulnerability management. Proficient in coordinating with cybersecurity and network teams to ensure operational health and incident response in classified settings.

Highest-signal resume keywords

Windows-Based Server AdministrationDoD Security StandardsRMF ControlsSecret ClearanceCCNA-Security or Security+ CE Certification

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

System HardeningVulnerability RemediationOperating System PatchingTechnical DocumentationTroubleshootingChange ManagementAudit ReadinessUser AdministrationKVM AdministrationRed Hat Enterprise Linux (RHEL)

Tools & Technologies

VMwareVSphereVCenterOpenShiftDocker

Certifications & Qualifications

DoD 8570.01-M IAT Level 2 CertificationCCNA-SecuritySecurity+ CE

Industry Keywords

DoD EnvironmentSTIGsPOA&M TrackingCOMSEC ManagementIncident Response

Tech Stack

Tools & technologies

Cyber SecurityDockerLinuxOpenShiftVMware

About the role

Key responsibilities & impact

Administer, maintain, and support Windows-based servers and workstations in a cleared enterprise or mission-critical DoD environment
Deploy operating system patches, security updates, and hotfixes according to maintenance schedules and security requirements
Implement and sustain system hardening using DoD security standards, STIGs, and organizational cybersecurity policies
Identify and remediate vulnerabilities to support RMF controls, POA&M tracking, compliance, and audit readiness
Monitor system performance, availability, and operational health
Troubleshoot hardware, software, operating system, and access-related issues
Maintain system configurations, change records, and technical documentation
Coordinate with cybersecurity, network, and program teams on accreditation, incident response, and secure system operations in classified or controlled environments

Requirements

What you’ll need

Bachelor’s Degree with a minimum of 4 years of relevant experience, or Graduate Degree with a minimum of 2 years of relevant experience, or in lieu of a degree, a minimum of 8 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 within a cleared enterprise or mission-critical DoD environment
Knowledge of DoD security standards, STIGs, organizational cybersecurity policies, RMF controls, POA&M tracking, and audit readiness
Preferred: DoD COMSEC Manager or COMSEC account management experience
Preferred: Red Hat Enterprise Linux (RHEL) administration, patching, hardening, user administration, and troubleshooting
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