Information Systems Security Engineer (ISSE) Top Secret Clearance w/SCI eligibility

AMERICAN SYSTEMS•Dallas, TX

About The Position

AMERICAN SYSTEMS is seeking a highly experienced Information Systems Security Engineer (ISSE) to support a Special Access Program (SAP) in Dallas, Texas. This role is suited for an experienced security engineer who combines deep JSIG and RMF expertise with hands-on security assessment experience across both Linux and Windows systems in highly restricted environments. The ideal candidate understands security controls at an engineering level and can author, tailor, and defend documentation without reliance on automated RMF tools.

Requirements

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

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