Senior Manager, Payroll and Equity

Responsibilities:
- Own end-to-end processing for semi-monthly and/or bi-weekly payroll across all U.S. states for exempt and non-exempt employees.
- Prepare and process special payrolls, including stock option exercises.
- Maintain compliance with state/local tax registrations, withholding requirements, SUI rates, and year-end filings (W-2, ACA).
- Maintain payroll system accuracy (earnings codes, deductions, tax configurations, pay rules).
- Own year-end payroll activities: review Forms 3921/3922, W-2, fringe benefit reporting, 401(k) limits, and ensure accuracy of state tax rates.
- Partner with HR and Finance for new hire setup, terminations, leave of absence pay, equity income, and bonus processing.
- Manage multi-state nexus tracking and flag new jurisdictional obligations as headcount expands.
- Review/approve monthly EOR invoices; reconcile EOR payroll registers to HR records and Finance cost centers.
- Oversee payroll tax filings, payments, corrections, and resolve tax issues.
- Review payroll for non-US employees.
- Partner with legal, tax, and Finance for entity readiness, payroll vendor selection, and local statutory requirements.
- Document payroll procedures, approval workflows, and data flows; create scalable runbooks.
- Manage/optimize ADP for continuous improvement.
- Produce payroll funding requests, journal entries, and accruals.
- Build payroll dashboards/audit reports; lead internal/external payroll audits.
- Enforce internal controls (data access, approval authority, change management).
- Act as project manager for payroll system integrations (HRIS, GL, expense).

Qualifications:
- 8+ years progressive payroll experience; hands-on multi-state U.S. payroll for 100–500+ employees (overtime-eligible and exempt).
- Experience with international Employer of Record (EOR) vendors and reviewing EOR outputs for accuracy/compliance.
- Experience standing up or significantly expanding payroll operations in at least one international jurisdiction.
- Strong payroll taxation knowledge (imputed income, equity comp, supplemental wages, fringe benefits).
- Proficiency with major payroll platform (ADP Workforce Now, Paylocity, Rippling, Workday, or equivalent) and Excel/Google Sheets.
- Exceptional attention to detail; track record of accuracy and on-time delivery.
- CPP or GPA certification.
- Prior experience at a biotech/life sciences/high-growth tech company.
- Equity administration platform experience (e.g., Carta, Shareworks) and processing equity-related payroll events.
- Experience supporting payroll integrations with NetSuite, Workday, or similar ERP/HRIS.