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We're looking for a full-time, staff Sr. Billing Analyst, GS to join our Day & Zimmermann team located in Glen Allen, VA or Lexington, KY. The Sr. Billing Analyst is responsible for executing and validating complex billing transactions in alignment with U.S. Government contract terms, including cost-reimbursable, T&M, and fixed-price agreements. This role ensures revenue accuracy through rigorous invoice preparation, journal entry management, and integration with project accounting systems, supporting both financial compliance and operational performance.