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About the Company    General Matter enriches uranium. We are designing, building, and operating the world’s lowest-cost enrichment services, here in the US.   In the process, we are restoring America’s ability to produce nuclear fuel to power AI, advanced manufacturing and critical industries our country relies on to remain competitive.  Fuel drives the cost of advanced reactor electricity production, and enrichment drives the cost of the fuel that advanced reactors consume.  Reliable, low-cost enrichment is the catalyst for the nuclear Renaissance now under way. Our mission is to make nuclear not only the cleanest and safest source of baseload power, but also the most affordable.  We believe abundant nuclear energy will lead to a post-scarcity society.  We were incubated inside Founders Fund, like Anduril and Palantir before us, and are backed by over a dozen of the world's top venture capital firms.   Our lean, world-class team of engineers and operators is applying a first-principles approach to solving the problem of nuclear fuel production.   We are a mission-driven company with a culture of urgency, accountability, and transparency.  Help us build a high-energy society by making the cleanest, safest form of baseload energy the most affordable.  About This Role    General Matter is building domestic uranium enrichment capability in the United States, and this role will own the security program needed to protect the people, facilities, nuclear material, technology, and sensitive information that make that mission possible. The  Head of  Safeguards & Security will build and lead an integrated security program covering physical security, personnel security, information security, classification, UCNI/CUI, OPSEC, nuclear material safeguards, regulatory readiness, and site security operations. This person will serve as the day-to-day security authority for the site, translating NRC requirements into practical procedures, training, assessments, corrective actions, and operating controls. The role is ideal for a security leader who can  operate  hands-on in a fast-moving technical environment while building a rigorous, regulator-ready program from the ground up.   Responsibilities   Build, implement, and lead General Matter’s integrated Safeguards & Security program, including physical security, personnel security, information security, classification, UCNI/CUI, OPSEC, insider threat coordination, visitor control, incident response, and security training. Serve as the company’s security program lead and site security point of contact for NRC, DOE, law enforcement, customers, auditors, and other government stakeholders. Support NRC Part 70 licensing and Part 73 physical protection readiness, including safeguards planning, access authorization interfaces, security recordkeeping, inspections, corrective actions, and compliance with applicable license conditions. Develop protection strategies for special nuclear material, controlled nuclear information, sensitive technical information, export-controlled information, proprietary technology, and other mission-critical assets. Lead classification and information security programs, including classification guidance, Derivative Classifier authorities, document review, marking, transmission, storage, release review, need-to-know controls, classified matter accountability, self-assessments, and corrective actions. Support nuclear material control and accountability interfaces, including MC&A planning, graded safeguards, inventory coordination, NMMSS-related reporting interfaces, physical protection integration, and investigation of anomalies or program degradations. Own Export Control, CUI, and OPSEC programs, including reviewing official appointments, handling and marking guidance, access controls, public release revi