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.
Physical Security Specialist I
The Security Specialist on the Physical Security team at Castelion is responsible for protecting personnel, facilities, technology, and controlled information through access control, visitor management, credentialing, and security operations. In this role, you will serve as the primary point of contact for facility entry, support compliance with export control requirements, monitor security systems, and maintain a secure operating environment. This position offers the opportunity to directly support the protection of advanced defense technologies while contributing to the growth of Castelion's security program.
Responsibilities
Serve as the primary access control authority for employees, visitors, contractors, and vendors entering Castelion facilities.Process visitors, validate access authorizations, coordinate host notifications, and ensure compliance with export control and company security requirements.Produce, issue, maintain, and account for employee, contractor, and visitor credentials and badge media.Monitor access control, CCTV, intrusion detection, and alarm systems and appropriately document and escalate security incidents.Maintain visitor, credential, and security records while supporting audits, compliance activities, and physical security program requirements.
Basic Qualifications
High school Diploma or GED.2+ years of experience in physical security, access control, visitor management, reception, customer service, military, or a related field.Experience verifying identities, credentials, and access authorizations.Strong written and verbal communication skills with the ability to interact professionally with employees, visitors, and senior leaders.Experience using computers and standard business software applications to maintain records and documentation.
Preferred Skills and Experience
Experience in aerospace, defense, manufacturing, technology, critical infrastructure, or government environments.Experience operating visitor management systems, access control systems, CCTV platforms, and alarm monitoring systems.Experience issuing and managing employee, contractor, and visitor credentials.Familiarity with International Traffic in Arms Regulations (ITAR), Controlled Unclassified Information (CUI), or export-controlled environments.Experience supporting front desk, lobby operations, security operations, or credentialing programs.
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.Ability to maintain professionalism while enforcing security requirements and denying access when necessary.Ability to manage multiple priorities in a fast-paced operations environment.Must be able to pass a background investigation and any required pre=employment screening.
Physical Demands
Ability to sit and stand for extended periods of time.Ability to occasionally move throughout office, manufacturing, and warehouse environments.Ability to occasionally lift and move items up to 40 pounds.
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.
Pay Range
$37.00 - $40.00/hour
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.