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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 We are seeking a skilled Nuclear Criticality Safety Engineer to join our team and play a critical role in ensuring the safe and effective handling of nuclear materials. You will be part of the team responsible for developing, implementing, and maintaining a criticality safety program to ensure compliance with regulatory requirements and industry standards. You will conduct evaluations, perform risk assessments, and provide technical expertise to support safe operations within a nuclear fuel cycle facility. Responsibilities Develop and maintain nuclear criticality safety evaluations (CSEs) for processes involving fissile materials. Perform criticality safety analyses, utilizing computational methods and tools (e.g., SCALE, MCNP) to assess system safety and compliance. Ensure compliance with NRC, DOE, and ANSI/ANS criticality safety standards and regulations. Conduct audits, inspections, and reviews of facility operations to identify and mitigate criticality safety risks. Collaborate with engineering, operations, and regulatory teams to implement effective safety measures. Provide technical guidance and training to personnel on criticality safety principles and procedures. Investigate criticality safety incidents and develop corrective actions as necessary. Maintain accurate documentation and records to support audits and regulatory reviews. Basic Qualifications Strong understanding of engineering fundamentals. Ability to perform trade studies and make clear recommendations using first principles and engineering fundamentals even with partial information. Bachelor’s degree in Nuclear Engineering, Physics, or a related field.  Strong knowledge of criticality safety regulations, standards, and methodologies (e.g., 10 CFR Part 70, ANSI/ANS-8 series). Proficiency in computational tools such as SCALE, MCNP, or similar software. Excellent analytical and problem-solving skills. Strong verbal and written communication skills, with the ability to convey technical information to diverse audiences. Ability to work collaboratively in a team-oriented environment. Preferred Skills and Experience Evidence of exceptional ability (prior projects, portfolio of work, completed products, etc). Experience in a fast-paced engineering environment or a highly technical role requiring a resourceful, entrepreneurial approach to complete tasks within tight timeframes or budget constraints. Certification as a Nuclear Criticality Safety Engineer (e.g., ANSI/ANS-8.24). Advanced degrees. Professional Engineer (PE) license is preferred or the ability t