We are seeking a highly experienced Senior General Ledger Accountant to join our newly established Shared Service Centre in Warsaw, Poland. This is a senior hands-on finance role responsible for managing complex general ledger activities, cash-related accounting matters, month-end and year-end close processes, reconciliations, statutory and US GAAP reporting support, and audit readiness across multiple countries. The successful candidate will bring deep technical accounting expertise, sound professional judgment, and strong ownership of end-to-end GL processes in a multinational environment. The role requires proven experience working with SAP, ideally SAP S/4HANA, strong knowledge of US GAAP and local statutory requirements, and the ability to operate effectively in a developing SSC/GBS environment. The incumbent will be expected to partner confidently with stakeholders across Europe, the US, and Asia, drive process discipline and continuous improvement, and contribute to building scalable finance processes as BeOne Medicines continues to expand globally.