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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.  Controller As General Matter’s Controller, you will play a pivotal role in building and scaling the company’s accounting function. You will lead all core accounting operations, design and maintain rigorous accounting systems and controls, and ensure readiness for audits in a highly regulated environment. This role requires deep expertise in GAAP and Cost Accounting Standards (CAS), along with hands-on experience operating within a CAS-covered organization. The ideal candidate brings a strong foundation in public accounting and thrives in building structure, driving compliance, and supporting a fast-growing, high-performing organization. Responsibilities Lead all financial close and reporting activities, ensuring timely, accurate financial statements in compliance with US GAAP, CAS, and applicable regulations. Own the company’s CAS compliance framework, including interpretation and application of CAS, maintenance of Disclosure Statements, and design of compliant cost accumulation and allocation methodologies. Serve as primary liaison for external audits and reviews, maintaining audit-ready documentation and responding to financial, CAS, and regulatory inquiries. Design, document, and maintain accounting policies, procedures, and internal controls that support scale, transparency, and regulatory compliance. Oversee accounting systems and infrastructure, including ERP and integrated tools, driving process improvements that increase efficiency, accuracy, and control. Support pricing, cost proposals, and contract compliance by providing accurate, compliant cost data, indirect rates, and financial analysis. Hire and lead the accounting team while partnering cross-functionally, translating accounting and CAS requirements into clear guidance that supports operational and strategic decision-making. Basic Qualifications Bachelor’s degree in Accounting, Finance, or related field. 8+ years of progressive accounting experience, including public accounting experience (e.g., Big 4 or mid-tier/regional firm). Demonstrated knowledge of Cost Accounting Standards (CAS) and cost accounting practices. Strong understanding of US GAAP and internal control frameworks. Experience supporting external audits and preparing detailed audit documentation. Hands-on experience with ERP/accounting systems and related tools. Advanced Excel skills and strong overall systems aptitude. Preferred Skills and Experience Bachelor’s degree in business, finance, economics, or engineering. Advanced skills in Microsoft Excel, applied business statistics, and general modeling exp