Financial Controller

Reports To: VP, Corporate and Finance Operations About Us We are a next-generation nuclear technology startup pioneering the commercialization of High-Temperature Gas-cooled Reactors (HTGRs) — a proven, safe, and transformative technology for delivering ultra-high-temperature heat and enabling a carbon-neutral future. Our mission is to deploy the world’s first global fleet of Advanced Modular Reactors , redefining how clean energy powers industries, communities, and economies. As a fast-growing company in its early stage, every team member — whether in engineering, program management, partnerships, operations, or business development — plays a direct role in shaping our technology, culture, and impact. You’ll join a collaborative, mission-driven team of internationally recognized experts and innovators working together to bring advanced nuclear energy to the world. The Role We are seeking an experienced, hands‑on Controller to own our financial operations and build a scalable accounting function. This critical leadership role has full ownership of the end-to-end accounting process—from entity-level bookkeeping oversight to complex global consolidations—and is responsible for the integrity of our financial statements, internal controls, and tax compliance as we scale toward listed-company requirements. Key Responsibilities Close & Consolidation Leadership: Direct and oversee both standalone and consolidated closing processes (Monthly, Quarterly, Annual), ensuring accuracy and timeliness. US GAAP & Technical Accounting: Serve as the organization’s technical accounting authority, researching and documenting complex transactions to ensure all financial statements and accounting treatments strictly adhere to US GAAP. Tax Oversight: Own the full suite of tax filings and compliance requirements, managing external tax advisors and ensuring accurate, timely execution. Executive & Board Reporting: Prepare and present high-quality monthly and quarterly reporting packages for senior management, executive leadership, and the board/audit committee. Team Leadership & Review: Build, manage, and mentor the accounting team; conduct detailed reviews of bookkeeping and reconciliations performed by staff or outsourced partners. External Audit Leadership: Own the external audit relationship and lead all audits for listed-company requirements, including internal controls (SOX) documentation and readiness. Internal Controls: Design, implement, and maintain a robust internal control environment across the organization. Treasury Oversight: Oversee cash flow forecasting, banking relationships, and liquidity management across entities. What You Bring Education: Bachelor’s degree in Accounting, Finance, or a related field. Experience: 10+ years of progressive accounting experience, including people management and tenure at a publicly listed company or a PCAOB-audited environment. Technical Skills: Deep expertise in US GAAP, consolidation accounting, internal controls (SOX), and tax filing processes, as well as FP&A. Experience in implementation or process building of ERP system (NetSuite is a big plus. Mindset: A hands‑on leader who can build and manage a high‑performing team while staying close to the details. Flexible Schedule: The ability to take meetings on JST-friendly time slots is also required. Certifications Active Certified Public Accountant (CPA) license required. Even Better Experience with SEC reporting requirements or IPO readiness. Tenure in the energy sector business, especially with an international company. Fluent/Native English is required, and any level of Japanese is a plus. Why Work for Us Flexible hours. Health/Life/Disability benefits. Vacation/Sick leave. Work alongside internationally recognized experts shaping the future of nuclear energy. EEO Statement ZettaJoule is an Equal Employment Opportunity employer committed to diversity and inclusion. #J-18808-Ljbffr