Senior Cybersecurity Analyst

Castelion Corporation•Torrance, CA

1d•Onsite

About The Position

We are seeking an experienced Senior Cybersecurity Analyst to join our team. This role will be responsible for protecting sensitive systems, data, and infrastructure critical to national security. The ideal candidate will have expertise in threat detection, SOC operations, incident response, and compliance frameworks specific to the defense industrial base.

Requirements

3+ years of experience in cybersecurity, information security, or related technical security roles
Hands-on experience with security operations, incident response, and threat analysis
Expert knowledge of security tools: SIEM (Splunk, QRadar, Sentinel), EDR (CrowdStrike, Carbon Black), IDS/IPS
Deep knowledge of MITRE ATT&CK framework and adversary tactics, techniques, and procedures
Familiarity with threat intelligence platforms and OSINT techniques
Experience protecting Controlled Unclassified Information (CUI)
Experience operating within aerospace, defense, national security, government contracting, or highly regulated technical environments
Strong understanding of network protocols, operating systems (Windows, Linux), and cloud environments
Experience as a member of incident response protocols, vulnerability management, and security operations functions
Proficiency in scripting/automation
U.S. Person status required to comply with ITAR regulations
Ability to obtain and maintain a U.S. security clearance

Nice To Haves

Experience supporting defense manufacturing or operational technology (OT/ICS) environments
Experience securing embedded systems, avionics, autonomous systems, or weapon systems
Experience at high-growth startups or scaling organizations
Hands-on experience implementing SIEM and SOAR operations
Experience with CMMC 2.0, NIST SP 800-171, DFARS 252.204-7012/7020/7021, ITAR, and related defense compliance requirements
Industry certifications such as Security+, CEH, CISA, GIAC, or equivalent
Degree in Cybersecurity, Computer Science, Engineering, or related field

Responsibilities

Lead 24/7 security monitoring efforts using SIEM platforms and advanced threat detection tools
Analyze security events, identify potential threats, and coordinate incident response activities
Identify vulnerabilities and recommend remediation strategies for complex environments
Analyze malware, APT tactics, and threat actor behavior
Perform threat hunting activities to proactively identify sophisticated adversaries
Conduct forensic analysis of security incidents involving classified and sensitive systems
Contribute to compliance with NIST 800-171, CMMC, DFARS, ITAR, and other DoD requirements
Contribute to and/or maintain security documentation including internal documentation, policies and procedures, incident reports, and audit artifacts
Configure and maintain security tools including IDS/IPS, EDR, DLP, and vulnerability scanners
Support secure architecture reviews across the organization
Mentor junior analysts and contribute to team skill development
Coordinate with IT, engineering, manufacturing, and program teams on security initiatives
Participate in threat intelligence sharing with government and industry partners