Senior Financial Controller

About Nebius: Nebius is leading a new era in cloud infrastructure for the global AI economy. We are building a full-stack AI cloud platform that supports developers and enterprises from data and model training through to production deployment, without the cost and complexity of building large in-house AI/ML infrastructure. Built by engineers, for engineers. From large-scale GPU orchestration to inference optimization, we own the hard problems across compute, storage, networking and applied AI. Listed on Nasdaq (NBIS) and headquartered in Amsterdam, we have a global footprint with R&D hubs across Europe, the UK, North America and Israel. Our team of 1,500+ includes hundreds of engineers with deep expertise across hardware, software and AI R&D. Role Overview The Senior Controller is responsible for full financial ownership of assigned US entities, including month-end close, statutory and tax compliance, and overall financial integrity. This role acts as a trusted business partner to cross-functional stakeholders, ensuring accurate month-end close, strong controls and proactive financial oversight. The position requires a highly experienced accounting professional with a Big 4 background, capable of leading complex accounting matters, driving process improvements and enhancing automation and scalability of finance operations. Key Responsibilities Full Ownership of US Entities • Act as the primary finance owner for assigned US entities, ensuring end-to-end accountability for financials. • Serve as a trusted partner to stakeholders across Tax, Legal, FP&A and business teams. • Provide financial insights, guidance, and support for business decisions and transactions. • Lead transformation initiatives (local and global), including automation and standardization of processes to improve efficiency, accuracy and scalability. Month-End Close Leadership • Lead and oversee the month-end close process, ensuring timely, accurate and complete financial close. • Prepare, review and approve journal entries, accruals, reconciliations, and supporting documentation. • Analyze financial performance, explain key variances, and ensure transparency of financial results. • Ensure consistency and integrity of financial data across systems and reports. Financial Oversight & Technical Accounting • Maintain full ownership of financial accuracy across all accounting areas. • Support accounting for complex and non-routine transactions, including large deals, acquisitions, and infrastructure investments. • Review key estimates, accruals, and judgments to ensure compliance with US GAAP and internal policies. • Act as a second line of control, ensuring completeness and consistency across the month-end close and control framework. Statutory & Regulatory Compliance • Oversee all statutory and tax compliance activities for US entities, including: • Corporate Income Tax and Sales & Use Tax (in coordination with Tax team) • Statutory financial statements (where applicable) • Regulatory and statistical filings (where applicable) • Ensure accurate and timely filings across all jurisdictions. • Maintain and oversee a comprehensive compliance calendar with clear ownership and accountability. • Review and approve statutory and tax adjustments recorded in ERP systems. • Lead external and internal audit processes. Stakeholder Management & Coordination • Act as the key point of contact for internal and external stakeholders, including auditors and advisors. • Coordinate effectively with Tax, Legal, FP&A and Group Reporting teams. • Ensure clear ownership, timelines, and delivery across all parties. • Provide technical accounting guidance and mentorship where needed. • Manage and develop a small team, including task allocation, review, and co