Senior Administrative Assistant

The Senior Administrative Assistant provides comprehensive operational and administrative support to the Outside Service Provider Support Group (OSPSG) and the Center Assistant Manager. This role ensures smooth execution and continuity of daily, weekly, monthly, and quarterly activities.

Key Responsibilities

Billing & Cost Administration

• Manage OSP billing activities, including the preparation and execution of weekly and monthly OCM billing for assigned customers.
• Prepare and submit monthly OSP cost accruals to the Finance & Accounting team in a timely and accurate manner.
• Support OSP cost analysis by maintaining and updating vendor volume and cost data in the system.
• Ensure all billing data is accurate, complete, and compliant with internal policies and procedures.

Invoice Management & Reporting

• Upload vendor invoices to the Accounts Payable p...