Lead Systems Administrator

L3Harris Technologies

. Administer, configure, monitor, and troubleshoot Red Hat/CentOS Linux systems in secure, mission-focused environments .

Posted 9/30/2026full-timeMelbourne • Florida • United StatesSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in administering and securing Red Hat/CentOS Linux systems and AWS GovCloud/C2S cloud infrastructure, with a strong focus on compliance with DoD security standards and RMF controls. Proficient in troubleshooting, system hardening, and maintaining operational health in mission-critical environments.

Highest-signal resume keywords

Red Hat Linux AdministrationAWS GovCloud/C2S ManagementDoD Security Standards ComplianceVulnerability Identification and RemediationTop Secret/SCI Clearance

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Linux System AdministrationAWS Cloud InfrastructureJBoss Services SupportSystem HardeningVulnerability RemediationConfiguration ManagementAutomation ToolsVirtualization TechnologiesIncident ResponseAudit Readiness

Tools & Technologies

Automation ToolsVirtualization TechnologiesDocker ContainersMicroservicesPKIOAuth

Certifications & Qualifications

CCNA-SecuritySecurity+ CEDoD 8570.01-M IAT Level 2

Industry Keywords

RMF ComplianceSTIGsPOA&M TrackingCybersecurity PoliciesAccreditation Activities

Tech Stack

Tools & technologies

AWSCloudCyber SecurityDockerLinuxMicroservices

About the role

Key responsibilities & impact

Administer, configure, monitor, and troubleshoot Red Hat/CentOS Linux systems in secure, mission-focused environments
Deploy and manage AWS GovCloud/C2S cloud infrastructure using automation tools and virtualization technologies
Operate as an AWS Cloud Systems Administrator supporting and maintaining JBoss-based services
Implement and sustain system hardening measures using DoD security standards, STIGs, and organizational cybersecurity policies
Perform vulnerability identification and remediation to support RMF compliance controls, POA&M tracking, and audit readiness
Monitor system performance, availability, and operational health
Troubleshoot and resolve software, operating system, and access-related issues while following security procedures
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
Travel locally from L3Harris to Patrick SFB (AFTAC) as needed

Requirements

What you’ll need

Bachelor’s Degree and minimum 9 years of prior relevant experience, or Graduate Degree and minimum 7 years of prior related experience
In lieu of a degree, minimum 13 years of prior related experience
Top Secret/SCI Clearance
DoD 8570.01-M IAT Level 2 required professional certification: CCNA-Security, Security+ CE, or higher certification
Experience configuring, monitoring, maintaining, and troubleshooting Red Hat and CentOS Linux systems
Experience with AWS GovCloud/C2S cloud infrastructure, automation tools, and virtualization technologies
Experience supporting and maintaining JBoss-based services
Knowledge of DoD security standards, STIGs, organizational cybersecurity policies, RMF controls, POA&M tracking, and audit readiness
Preferred: experience with PKI and/or OAuth authentication models
Preferred: experience integrating, securing, and administering cross-domain systems
Preferred: experience integrating, securing, and administering microservices and Docker containers

Benefits

Comp & perks

9/80 schedule: Employees work 9 out of every 14 days, totaling 80 hours worked, with every other Friday off
Reasonable accommodation for individuals with disabilities