Castelion
Information Systems Security Manager (ISSM)
Torrance, CA +1 · Manager · Full-time · Posted Sep 7, 2026
- Location
- Torrance, CA
19951 Mariner Ave, Torance, CA 90503 - Experience
- 3+ years in cyber assurance; alternatively, 5+ years managing cyber assurance for classified systems/networks may replace the degree requirement.
- Education
- Bachelor’s degree or equivalent experience (5+ years managing cyber assurance for classified computer systems/networks).
About the job
Leads Castelion’s classified cyber assurance program, managing security authorization, compliance, governance, assessments, and stakeholder communications for classified information systems.
What you'll do
- Manage the complete RMF A&A lifecycle, maintain active ATOs, and ensure classified systems comply with regulatory, policy, and contractual requirements.
- Coordinate audits, assessments, and tests; identify emerging requirements and select tools to improve program effectiveness.
- Represent the program to internal and external stakeholders and mentor cyber assurance analysts.
What they ask for
- Bachelor’s degree or 5+ years managing cyber assurance for classified computer systems/networks in lieu of a degree.
- 3+ years of experience in cyber assurance.
- Active Top Secret clearance with SCI eligibility.
- DoD IAM Level III eligibility based on active certifications; CI-scope polygraph or ability to successfully complete.
Nice to have
- Experience with NRO and JSIG A&A processes, the RMF 7-step process, and obtaining ATOs for networks, weapon systems, or satellite systems.
- COMSEC experience; a Master’s degree in Cybersecurity.
Tools
Nessus, Splunk, Security Center, Service Now (SNOW), eMASS
Model-written summary · the original posting is authoritative