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Castelion
Information System Security Engineer
Torrance, CA · On-site · Full time · Mid level
About the role
Translate security requirements into tested controls for classified information systems. Harden systems, configure security tools, and support system authorization.
What you’ll do
• Harden Windows, RHEL, virtualization, and network infrastructure. • Configure and maintain SIEM, endpoint protection, and logging. • Assess vulnerabilities and implement approved fixes. • Support RMF activities for Authorization to Operate. • Review software and support controlled testing and release.
What you’ll bring
• Experience with classified information systems and security boundaries. • Knowledge of Windows, Linux, Active Directory, and Group Policy. • Experience applying DISA STIGs and vulnerability assessment. • Current cybersecurity certification per DoD requirements. • U.S. citizenship and active TS/SCI clearance required.
Life at Castelion
Offers long-term equity, four weeks PTO, ten holidays, comprehensive health benefits, paid parental leave, fitness stipend, onsite EV charging, catered meals, and stocked kitchen.
About Castelion
Castelion develops advanced defense systems focusing on execution, ownership, and excellence.