Assistant Controller

The Nuclear Company is the fastest growing AI tech-enabled startup in the nuclear and energy space, pioneering a fleet-scale approach to building the next generation of nuclear reactors. Through our design-once, build-many model, we're accelerating the deployment of safe, reliable, and affordable nuclear energy. We operate with an AI-first mindset. Every employee is expected to leverage AI, technology, and the Nuclear Operating System (NOS) as integral components of their role to improve the quality, speed, and impact of their work. We expect every team member to continuously identify opportunities to automate workflows, enhance decision-making, improve processes, and contribute to the ongoing evolution of NOS as a strategic operating capability that enables The Nuclear Company to scale with excellence. We hire people who are driven by purpose, thrive in ambiguity, and are energized by building what has never been built before. Our team combines intellectual curiosity with high agency, embraces candid feedback and continuous learning, and holds themselves and others to exceptional standards. Our values— Transparency, Responsibility, Unity, Scrappiness, and Tenacity —guide how we hire, collaborate, and make decisions every day. They are not words on a wall; they are the standard by which we operate. TRUST is the foundation of our safety culture, fostering intellectual honesty, accountability, and open communication, while our values challenge every team member to execute with urgency, humility, resilience, and an unwavering commitment to our mission. About the role The Assistant Controller will play a critical, hands-on role in the organization’s daily accounting operations and financial reporting. Reporting to and working closely with the Controller, this position requires a strong working knowledge of Generally Accepted Accounting Principles (GAAP), financial analysis, and internal control best practices. The Assistant Controller will be instrumental in managing the month-end close process, assisting with the preparation of accurate financial statements, and ensuring compliance across transactional accounting activities. In addition, this position will support the accounting and reporting needs of the company’s growing nuclear services business segment. This role provides an excellent opportunity to develop leadership skills, drive process efficiencies, and contribute to the continued growth of the finance function within a rapidly scaling organization. **NOTE: This role can work a hybrid schedule out of our Washington, DC or Columbia, SC office. Candidates should be within commuting distance of one of these locations or open to relocation. Role Responsibilities Financial Reporting Assistance: Assist in the preparation of accurate and timely financial statements, including balance sheets, income statements, and cash flow statements. Provide support for financial analysis projects and management reporting. Accounting Operations Execution: Manage the execution of specific accounting functions, such as overseeing the general ledger reconciliation process, reviewing accounts payable and accounts receivable, and ensuring the accuracy of complex journal entries. Month-End and Year-End Support: Execute key tasks within the month-end and year-end close processes, including managing accruals, preparing balance sheet reconciliations, and ensuring timely completion of close activities. Internal Controls and Compliance: Help maintain and enforce effective internal controls across accounting operations. Support the documentation and testing of controls to ensure compliance with financial regulations and company policies. Budgeting and Forecasting Support: Provide supporting data and analysis for annual budgeting and ongoing forecasting processes. Track departmental spending and assist with variance analysis. Nuclear Services Segment Support: Support the accounting and reporting needs of the company’s growing nuclear services business seg…