Requisition #: 1929 Job Title: Information System Security Engineer (ISSE) Senior Location: Quantico, VA Clearance Level: Top Secret Clearance Required Required Certification(s): One of the following: CCISO, CISA, CISM, CISSO, CISSP, CISSP-ISSEP, CPTE, CySA+, FITSP-A, GCSA, GSLC, or GSNA Job Description. This role supports the technical analysis needed to differentiate systems by risk, technology stack, overlays, and operational dependencies, and to ensure those categorizations effectively inform labor allocation, reporting, and cost recovery.