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 and technical excellence are decisive advantages - and we are building a team that can deliver real capability, not just concepts. This is a rare opportunity to join at an early stage, where your work will directly shape critical systems, influence major technical decisions, and have immediate, real-world impact. Industrial Security Specialist Castelion Corporation is currently looking for an Industrial Security Specialist. The Industrial Security Specialist will provide support to the Security department by performing security administrative day-to-day functions, assisting in the management of multiple programs and systems, maintaining PERSEC for multiple programs, and assisting management wherever needed. The ideal candidate will work effectively in a fast‐paced, team‐oriented environment with a high level of attention to detail, effective organizational skills, and the ability to adapt to constantly changing demands, excellent customer service skills, and demonstrate capability to take on new and unfamiliar tasks. The Industrial Security Specialist will be responsible for assisting with all security functions at the Torrance, CA office, as well as assisting in FSO duties to ensure compliance with DCSA, in accordance with 32 CFR Part 117, the National Industrial Security Program Operating Manual (NISPOM) Rule, SAP and SCI security program SCGs, and related federal regulations. The Industrial Security Specialist will ensure that all classified information is properly safeguarded, personnel security clearances are maintained, and the facility remains compliant with government security
requirements. This role will require the Industrial Security Specialist to assist the Manger of Government Security Programs and Senior Industrial Security Specialists in the oversight of all security operations, including physical security, program security, personnel security, COMSEC, SETA, CUI Control, and visitor control. This position has the potential for future growth opportunities.
Responsibilities Assist with self-inspections and annual DCSA assessments as directed. Assist with self-inspections and government inspections on SAP and SCI programs. Notify personnel of expirations of credentials and clearances, and ensure they stay active. Coordinate all internal clearance action
requirements Conduct security portion of In/Out processing Assist with program specific In/Out briefings Ensure proper coordination, and verification of accesses, for incoming and outgoing classified meetings Assist with acquisition and maintenance of COMSEC account and Crypto equipment Help update and Maintain Security policy documentation (SPP, SOPs, Insider Threat Plan, OPSEC, PPIPs, Company Security Trainings, etc.) Assist with required PAR actions Manage facility, and secure area(s), access control, alarm, badging, and camera system(s) Facilitate all Badge Requests Assist with National Industrial Security Program (NISP) compliance and other security-related activities for all facilities within the corporation, including document control, visitor control, physical access/control, education and training, personnel security, and preparation of DD 254's for classified contracting. Assist in interpreting policies, disseminating information, and ensuring compliance for company employees and visitors as required. Assist in NISS record maintenance for facility documents. Assist in inventory, safeguarding and storing, delivery of classified material and/or return of transmittal receipts. Assist in maintenance of Security personnel files in compliance with legal
requirements and company policies and procedures. Awareness of and compliance with company policies and procedures as defined in the Castelion Employee handbook Awareness of and compliance with NISP security policies to include 32 CFR 117 (National Industrial Security Program Operating Manual (NISPOM) Rule), Industrial Security Letters (ISLs) and working knowledge of Government security regulations and policies. Perform other duties or tasks as assigned. Basic
Qualifications Active Secret clearance with current periodic reinvestigation and ability to obtain/maintain Top Secret Clearance. Minimum High School Diploma Minimum 3 years experience in Industrial Security or related field Microsoft Office products, Outlook, and internet proficiency. SIMS Database Experience Physical Security Experience: Alarm systems, access control systems, badging, etc. Effective verbal and written communication skills. Strong organizational skills and attention to detail. Experience and familiarity with U.S. Government NISS/DISS systems. Preferred
Qualifications Knowledge of SAP manuals and ICD 705. Active Top Secret Clearance w/ SCI eligibility The ability to learn new functions and programs/systems. Jira, Confluence and Sharepoint experience Associate's degree or higher 5+ years experience in Industrial Security or related field Comprehensive knowledge of the National Industrial Security Program and related training, FSO Certification from the Defense Counterintelligence & Security Agency (DCSA) (i.e. CDSE STEPP Courses). Familiarity with COMSEC and OPSEC. Familiarity with Intrusion Detection, Access Control Systems, and CCTV. 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 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.
Benefits And
Perks All full-time employees are granted meaningful long-term equity, sharing in the company's significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health
benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy
perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day. While this position does not currently require a U.S government-issued security clearance, it may in the near future. Therefore, the ability to obtain and maintain a U.S. government– issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance. Affirmative Action/EEO Statement Employment with Castelion is governed on the basis of competence and
qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.
About Castelion
Castelion is a modern defense production company building long-range hypersonic strike systems to address a critical national security gap. Founded in 2021, Castelion was created in response to the recognized need for the United States to rapidly develop hypersonic capabilities to remain competitive with near-peer adversaries and deter future conflicts.
The company operates under the philosophy of "Peace through Deterrence" — building the weapons systems that ensure conflicts never need to happen. Castelion is one of the few companies in the hypersonics space that has moved beyond concepts to actual production deliverables, with government contracts across multiple branches of the military and a $23M+ Navy order for 50 units in calendar year 2027.
Backed by over $469M in funding from top-tier investors including Andreessen Horowitz, Lightspeed Venture Partners, and General Catalyst, Castelion is scaling rapidly. The company is building what it anticipates will become the preeminent hypersonics campus in the country — including a $150M, 1,000-acre solid rocket motor manufacturing facility in Rio Rancho, New Mexico, alongside its headquarters in Torrance, California.
Castelion's culture is defined by technical excellence, ownership, and velocity. Engineers own meaningful subsystems on the vehicle and are responsible for driving their success. The company follows a responsible engineering model inspired by SpaceX, where individuals choose the highest-value work and are empowered to cultivate resources and partnerships to deliver results. The engineering bar is exceptionally high — attracting elite talent who want to be surrounded by other elite talent.
