The Senior Accountant plays a critical role in ensuring efficient, accurate, and well-controlled accounting operations for TWS. This position owns key accounting processes end-to-end, including general ledger maintenance, balance sheet reconciliations, bank reconciliations, revenue accounting, and month-end close. The Senior Accountant exercises strong professional judgment, proactively identifies and resolves accounting issues, and ensures transactions are recorded in accordance with GAAP and nonprofit accounting standards. This role serves as a financial steward for restricted and unrestricted funds, supporting fund accounting, grants, and multi-year contributions while maintaining audit-ready documentation and internal controls. This role requires a high degree of independence