CyberSecurity Engineer III

PMAT INC.

Cybersecurity Engineer III securing classified infrastructure for PMAT, a defense technology company. Administering cloud, virtualization, systems, networks, automation, vulnerabilities, and compliance across mission environments.

Posted 8/14/2026full-timeSan Diego • California • 🇺🇸 United StatesMid-LevelSenior💰 $150,000 - $180,000 per yearWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in designing and administering secure infrastructure stacks, including VMware ESXi and vSAN environments, while implementing security controls in compliance with NIST SP 800-53 and DISA STIG requirements. Proficient in automating system management and vulnerability remediation in classified environments.

Highest-signal resume keywords

VMware ESXi AdministrationRHEL System AdministrationAnsible AutomationNIST SP 800-53 ComplianceCompTIA Security+ Certification

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Infrastructure EngineeringSystems AdministrationNetwork EngineeringSecurity Control ImplementationVulnerability RemediationAutomation TechnologiesCloud ArchitectureRouting ProtocolsData Center OperationsCompliance Documentation

Soft Skills

CollaborationProblem-SolvingCommunication

Tools & Technologies

VMware vSANACASNessusSplunkActive DirectoryAtlassian SuiteVeeamTerraformJenkinsPDQ

Certifications & Qualifications

CompTIA Security+CompTIA Network+ITIL Foundation

Industry Keywords

Department of DefenseIntelligence CommunityClassified EnvironmentsRegulated EnvironmentsCompliance-Driven Environments

Tech Stack

Tools & technologies

AnsibleCloudCyber SecurityJenkinsSplunkTerraformTypeScriptVMware

About the role

Key responsibilities & impact

Design and administer secure Secret and Top Secret infrastructure stacks in on-premises and private cloud environments
Design and administer large-scale VMware ESXi and vSAN virtualization platforms
Deploy, configure, administer, and maintain RHEL 6/7/8 and Windows Server 2019/2022 systems
Implement and remediate security controls according to NIST SP 800-53 and DISA STIG requirements
Automate system builds, patching, configuration, and hardening using Ansible, Jenkins, PDQ, WSUS, and related tools
Identify, track, and remediate vulnerabilities using ACAS, Nessus, Splunk, and other cybersecurity tools
Support enterprise services including Active Directory, databases, Veeam, Horizon, Atlassian Suite, YUM repositories, and monitoring platforms
Design and administer LAN/WAN and virtualized network backbones
Troubleshoot complex routing issues involving OSPF and BGP
Collaborate with engineering, cybersecurity, program, and mission teams
Support Authorization to Operate packages, compliance documentation, control validation, and security audits
Maintain secure and reliable environments throughout development, accreditation, and operational lifecycles

Requirements

What you’ll need

Five or more years of experience in infrastructure engineering, systems administration, network engineering, or a closely related technical field
Experience administering VMware ESXi and vSAN virtualization environments
Experience deploying, configuring, administering, and maintaining RHEL and Windows Server environments
Experience with Ansible, Terraform, or related automation and Infrastructure as Code technologies
Experience implementing or remediating security controls according to DISA STIGs and NIST SP 800-53
Strong understanding of on-premises cloud architectures, enterprise virtualization, and secure data center operations
Experience remediating vulnerability backlogs in classified, regulated, or compliance-driven environments
Experience supporting Department of Defense, Intelligence Community, government mission systems, or similarly regulated environments
Ability to work with infrastructure, networking, cybersecurity, software, and mission stakeholders in a classified environment
Bachelor’s or master’s degree in a STEM field
CompTIA Security+ certification or ability to obtain within 12 months of hire
CompTIA Network+ certification or ability to obtain within 12 months of hire
ITIL Foundation certification
US citizenship required
No dual citizenship
Active TS with SCI eligibility
Willingness to travel approximately 20% CONUS

Benefits

Comp & perks

Remote position
Travel estimated at 20% CONUS travel
Continuous learning environment
Positive collaboration and capability development
Work alongside experienced experts
Inclusive, people-first culture
Equal-opportunity employment