Aerospace, Defense, Deep Tech, Hardware

Senior Cybersecurity Analyst

Torrance, CAOnsiteFull TimeSeniorPosted 2 months ago

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Required skills

national security
defense industrial base
SIEM
Splunk
QRadar
Sentinel
EDR
CrowdStrike
Carbon Black
IDS/IPS

Nice to have

defense manufacturing
OT/ICS
embedded systems
avionics
autonomous systems
weapon systems

Role summary

Seeking a Senior Cybersecurity Analyst to protect national security-critical systems and infrastructure. Responsibilities include leading 24/7 security monitoring, incident response, threat detection, vulnerability analysis, and forensic analysis. The role requires expertise in SIEM, EDR, IDS/IPS, MITRE ATT&CK, and compliance frameworks like NIST 800-171, CMMC, DFARS, and ITAR. The candidate will contribute to security documentation, configure security tools, mentor junior analysts, and collaborate with various teams. A U.S. security clearance and U.S. Person status are required.

Why Castelion, Why Now

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

Senior Cybersecurity Analyst

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.

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

Basic Qualifications

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

Preferred Skills and Experience

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

Additional Requirements

Ability to put in extended hours, including evenings and weekends, when required to meet aggressive timelines

This role is based in Torrance, CA and requires full-time onsite presence

Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

Additional Eligibility Requirements

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.

Affirmative Action/EEO Statement

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.

EAR/ITAR Requirements

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.

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Senior Cybersecurity Analyst

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Required skills

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