Prepare and submit client invoices for all projects within the assigned portfolio, ensuring invoices are accurate, consistent with client requirements, and submitted on a timely basis. Upload invoices and supporting documentation to external billing platforms such as SAP, Open. Invoice, Open. Ticket, and Ariba. Support downloading system-generated invoices and backup documentation. Research and resolve billing issues and inquiries with internal and external clients. Coordinate with project managers and other internal departments to ensure billing accuracy and resolve project-related issues. Monitor accounts receivable and follow up on overdue balances. Assist with project setup, maintenance, and closeout activities. Maintain organized project and billing files. Perform additional tasks as requested by the Billing Specialist or Controller. Qualifications. High school diploma or equivalent required; associate degree or higher preferred. Two or more years of experience in billing, account...Administrative Assistant, Billing, Administrative, Accounts Receivable, Assistant, Billing Specialist, Technology