AMERICAN SYSTEMS · 16 hours ago
Information Systems Security Engineer (ISSE) Top Secret Clearance w/SCI eligibility
Dallas, TX
Full-time
Onsite
Senior Level, Lead/Staff
$130K/yr - $217K/yr
8+ years expAMERICAN SYSTEMS is seeking a highly experienced Information Systems Security Engineer (ISSE) to support a Special Access Program (SAP) in Dallas, Texas. This role involves designing and implementing enterprise-level security architectures and performing hands-on security assessments on Linux and Windows systems in highly restricted environments.
GovernmentInformation Technology
No H1B
Security Clearance RequiredU.S. Citizen Only
Responsibilities
Design and implement enterprise-level security architectures for SAP systems
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
Qualification
Required
Active Top Secret clearance with SCI eligibility
Willingness to submit for a CI Polygraph
Bachelor's degree in a STEM discipline with 10–11 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
DoD 8140 IAT Level III–equivalent certification (e.g., SecurityX, CISSP, CCNP Security, CISA, GCED, GCIH, or CCSP)
Demonstrated experience supporting Special Access Programs (SAP)
Working knowledge of JSIG and its application to RMF authorization
Proven experience authoring RMF/JSIG artifacts by hand, without reliance on automated RMF tools (eMASS, Xacta, etc.)
Strong background in RMF, ICD 503, NIST SP 800-53, DCID 6/3, or current DoD authorization practices
Hands-on security assessment experience across Linux systems, including command-line validation when required
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
Healthcare benefits
Paid leave
Retirement plans
Insurance programs
Education and training assistance
Company
AMERICAN SYSTEMS
AMERICAN SYSTEMS is one of the largest employee-owned companies in the US.
1001-5000 employees
Funding
Current Stage
Late StageLeadership Team
John Steckel
President & CEO
Peter Whitfield
Chief Financial Officer
Recent News
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