Expatriate Payroll & Tax Management: Manage end-to-end payroll operations for international assignees, including regular pay, allowances, miscellaneous expenses, tax gross-ups, and shadow payroll (for Japan salary, bonus, and retirement funds). Serving as a key liaison between HR teams in the U.S. and Tokyo, internal managers, and external service providers, you will leverage your expertise in accounting, HRIS, and global mobility to strengthen HR operations and optimize service delivery.