General Ledger Senior Accountant

If you’re interested in this role, please apply in English and include an English version of your Resume/CV.   The Role: Joining Moderna means advancing mRNA science to transform medicine. Work with exceptional global teams on a broad pipeline and build a career that makes a real difference for patients. Moderna is strengthening its international business services hub in Warsaw, supporting our growing global operations. We welcome professionals ready to help advance our mission and shape the future of mRNA medicines. Join Moderna's U.S. Accounting organization from our Warsaw Enterprise Solutions Hub, where you'll play a pivotal role in delivering accurate, timely, and insightful financial reporting. As an individual contributor, you'll partner with global stakeholders to support Fixed Assets and General Ledger accounting while helping drive operational excellence, automation, and continuous improvement. This is an opportunity to work at the intersection of finance, technology, and innovation, with exposure to digital tools and emerging AI-enabled solutions that continue to transform accounting operations. Here's What You'll Do: Support General Ledger accounting activities, including prepaids, accruals, cash accounting, fixed asset capitalization, Construction in Progress (CIP), transfers, disposals, depreciation, account reconciliations, accounting analyses, and maintenance of fixed asset records in SAP. Support month-end, quarter-end, and year-end close activities for Fixed Assets and General Ledger, including preparing and posting journal entries, reconciliations, supporting schedules, and close analyses. Partner closely with the U.S. Accounting team and cross-functional stakeholders to deliver an accurate, complete, and timely financial close. Review capital projects and fixed asset transactions to ensure compliance with U.S. GAAP and company accounting policies. Maintain documentation supporting SOX internal controls, audit readiness, and compliance requirements. Support internal and external audits by preparing documentation and responding to auditor requests. Drive continuous improvements, automation, and standardization across General Ledger and Fixed Assets accounting processes. Leverage digital technologies and emerging automation capabilities to improve the efficiency, scalability, and accuracy of accounting operations. Collaborate with Accounting, Finance, Procurement, Engineering, Facilities, and other business partners to support capital investments and operational objectives. Analyze accounting transactions, investigate variances, identify root causes, and recommend practical solutions to improve financial reporting and operational efficiency. Work closely with both the U.S.-based Accounting team and the Poland-based Accounting Manager to support global accounting operations. Participate in special projects, system implementations, compliance initiatives, audits, and evolving…