Castelion
Senior Cybersecurity Analyst
Torrance, CA +1 · Senior · Full-time · Posted Sep 7, 2026
- Location
- Torrance, CA
19951 Mariner Ave, Torance, CA 90503 - Experience
- 3+ years; no alternatives stated.
- Education
- A degree in Cybersecurity, Computer Science, Engineering, or a related field is preferred; no equivalent-experience alternative stated.
- Visa sponsorship
- U.S. Person status is required to comply with ITAR. The role requires access to export-controlled information without additional export licensing; the posting also says a security clearance may be required and that candidates will be notified if such requirements apply.
About the job
Protects Castelion’s sensitive and defense-related systems through security monitoring, threat analysis, incident response, vulnerability remediation, and compliance work.
What you'll do
- Lead security monitoring, threat hunting, and incident response, including forensic analysis of sensitive and classified systems.
- Identify vulnerabilities, recommend remediation, maintain security tools, and support secure architecture reviews.
- Contribute to defense compliance and security documentation; coordinate security initiatives across teams and mentor junior analysts.
What they ask for
- 3+ years of experience in cybersecurity, information security, or related technical security roles.
- Hands-on experience with security operations, incident response, and threat analysis; experience protecting CUI and working in a defense, national security, government contracting, aerospace, or highly regulated technical environment.
- Expertise with SIEM, EDR, and IDS/IPS tools; deep knowledge of MITRE ATT&CK; familiarity with threat intelligence platforms and OSINT; proficiency in scripting/automation.
- U.S. Person status required; ability to obtain and maintain a U.S. security clearance.
Nice to have
- Experience in defense manufacturing or OT/ICS, or securing embedded, avionics, autonomous, or weapon systems; experience at a high-growth startup or scaling organization.
- Hands-on SIEM and SOAR implementation; defense compliance experience; industry certifications such as Security+, CEH, CISA, or GIAC; relevant degree.
Tools
SIEM, Splunk, QRadar, Sentinel, CrowdStrike, Carbon Black, IDS/IPS, Windows, Linux
Model-written summary · the original posting is authoritative