Information Systems Security Engineer / ISSE (HPC)

AMERICAN SYSTEMS•Arlington, VA

38d•$165,000 - $200,000•Onsite

About The Position

AMERICAN SYSTEMS, a 100% employee-owned federal contractor, is seeking a highly experienced Information Systems Security Engineer (ISSE) to support RHEL and Windows systems in a High Performance Computing (HPC) environment in Arlington, VA. This role includes a $10,000 sign-on bonus in addition to a generous compensation package.

Requirements

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, including command-line validation
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

Responsibilities

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