Information Systems Security Engineer – ISSE, HPC

AMERICAN SYSTEMS

Information Systems Security Engineer managing security architectures and assessments in High Performance Computing. Collaborating with teams to integrate security and respond to incidents in Arlington, VA.

Posted 7/6/2026full-timeArlington • Virginia • 🇺🇸 United StatesSeniorLead💰 $165,000 - $200,000 per yearWebsite

Tech Stack

Tools & technologies

LinuxOracleSplunkSQL

About the role

Key responsibilities & impact

Design and implement enterprise-level security architectures for RHEL systems in a High Performance Computing (HPC) SAP environment
Apply JSIG requirements to system authorization, control implementation, and documentation
Manually develop RMF/JSIG authorization artifacts, including SSPs, control narratives, POA&Ms, and supporting evidence
Perform hands-on security assessments on Linux and Windows systems, including command-line audits, compliance scans, log review, and control validation
Analyze scan results, identify security gaps, and support remediation planning and execution
Validate and implement host-based firewall and security configurations in coordination with system administrators
Manage and track POA&Ms through mitigation, remediation, or risk acceptance
Ensure system compliance through continuous monitoring of controls, procedures, and documentation
Identify security deficiencies and provide actionable remediation recommendations
Support system recovery and security oversight following outages or incidents
Participate in change management activities, assessing security impacts to SAP systems
Support security investigations, incident response, and remediation activities
Collaborate with engineering teams to integrate security requirements into system design and production releases

Requirements

What you’ll need

Active Top Secret/SCI with SAP eligibility
Bachelor’s degree in a STEM discipline with 11–12 years of relevant experience, or Master’s degree with 8–10 years of relevant experience
Minimum 5 years of experience designing and implementing enterprise-scale security solutions with hands-on security assessment experience across Linux systems
DoD 8140 IAT Level III –equivalent certification (e.g., SecurityX, CISSP, CCNP Security, CISA, GCED, GCIH, or CCSP)
Strong background in RMF, ICD 503, NIST SP 800-53, DCID 6/3, or current DoD authorization practices
Working knowledge of the JSIG and its application to RMF authorization
Proven experience authoring RMF/JSIG artifacts by hand, without reliance on automated RMF tools (eMASS, Xacta, etc.)
Experience supporting security tools such as Splunk Enterprise, HBSS, McAfee ePO, ENS, and DLP
Demonstrated security engineering experience across Linux, Windows, Cisco platforms, databases (SQL or Oracle), and virtualized environments

Benefits

Comp & perks

comprehensive benefits package
healthcare benefits
paid leave
retirement plans
insurance programs
education and training assistance
$10,000 sign-on bonus

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

RHEL Systems SecuritySecurity AssessmentRMF ImplementationJSIG ApplicationLinux SecurityWindows SecurityControl ValidationCompliance MonitoringSecurity Configuration ManagementIncident Response

Soft Skills

CollaborationAnalytical ThinkingProblem SolvingCommunication

Certifications

Top Secret/SCI ClearanceDoD 8140 IAT Level III CertificationCISSPCCNP SecurityCISAGCEDGCIHCCSP