Information Systems Security Engineer

Reflexive Concepts is seeking a skilled Information Systems Security Engineer (Level
1) to join our growing team! Reflexive Concepts is seeking a skilled Information Systems Security Engineer (ISSE) to engineer and validate security controls on mission‑critical HPC environments — driving Assessment and Authorization, STIG implementation, and boundary integrity.

• Seven (7) years of information systems security engineering experience
• Bachelor's Degree or higher in a related technical field
  • An additional five (5) years of information systems security engineering experience may be substituted for the degree, for a total of Twelve (12) years

• RMF process and RMF tools: LATTEART, XACTA, BISCOTTI, WATCHCAT, STE
• Compliance and configuration scanning tools
• NIST SP 800‑53r3 and/or r5; NIST SP 800‑37
• Hands‑on experience with Assessment and Authorization, security control traceability, boundary definition, artifacts and body of evidence, STIG implementation, false‑positive validation, patch management, and technical validation
• Active TS/SCI clearance with full‑scope polygraph (most recent poly within 7 years)

• Continuous monitoring program experience
• Strong collaboration habits with system administrators and system owners