COMSEC Manager Torrance, CA Program Security

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.

COMSEC Manager

Castelion is a fast-paced startup developing innovative technology for high-consequence missions. We operate with urgency, ownership, and a commitment to exceptional security standards. We are seeking a highly experienced COMSEC Manager to lead and scale our Communications Security program. This is a hands‑on leadership role for an established COMSEC professional who can build compliant infrastructure, advise executive and technical leadership, and support the company’s rapid growth.

Position Summary

The COMSEC Manager will have overall responsibility for the company’s COMSEC program, including governance, account management, personnel authorization, cryptographic material accountability, secure communications operations, compliance, inspections, and incident response. The successful candidate will bring substantial experience managing complex COMSEC programs in defense, aerospace, intelligence, or other highly regulated environments. This individual must be comfortable operating independently, making high‑consequence decisions, and creating scalable processes in an evolving startup environment.

Key Responsibilities

• Lead the company‑wide COMSEC program and serve as the senior subject matter expert for COMSEC matters.
• Establish, maintain, and continuously improve COMSEC policies, procedures, controls, and operating standards.
• Manage one or more COMSEC accounts, including cryptographic material, equipment, facilities, records, inventories, and personnel access.
• Ensure compliant receipt, issuance, transfer, storage, use, accountability, return, and destruction of COMSEC material.
• Serve as the primary liaison with government COMSEC authorities, NSA, DoD organizations, customers, security representatives, and auditors.
• Advise executive leadership, program managers, engineers, and operations teams on COMSEC requirements and risk.
• Lead preparations for government inspections, customer assessments, internal audits, and compliance reviews.
• Direct COMSEC incident reporting, investigation, containment, corrective action, and lessons‑learned activities.
• Establish training, appointment, authorization, and recurring certification programs for COMSEC personnel and users.
• Oversee the secure deployment, operation, maintenance, and lifecycle management of COMSEC equipment.
• Develop scalable processes and systems that support rapid organizational growth without sacrificing security or compliance.
• Identify program risks, resolve complex issues, and drive continuous improvement across security operations.
• Mentor and develop COMSEC custodians, security personnel, and cross‑functional stakeholders.
• Support broader classified security, facility security, cybersecurity, and customer assurance activities as needed.

Required Qualifications

• 7+ years of progressively responsible experience in COMSEC, classified communications, information assurance, or a closely related security discipline.
• Extensive experience serving as a COMSEC Manager, COMSEC Custodian, Alternate COMSEC Custodian, or equivalent program lead.
• Demonstrated experience managing complex COMSEC programs, accounts, facilities, equipment, and cryptographic key material.
• Deep knowledge of applicable NSA, DoD, NISPOM, government, and…