Senior Billing Specialist

We are seeking an experienced Sr. Billing Specialist to join our Finance team and support billing, accounts receivable and collections activities for U.S. Government and commercial contracts.

The ideal candidate will have hands-on experience with government contract billing, accounts receivable, collections, FAR, CAS, contract types, indirect rates and unbilled revenue recognition. The successful candidate will be highly detail-oriented and comfortable working across Finance, Contracts, Program Management, and government and commercial customers.

• Prepare, review, and submit accurate and timely invoices for U.S. Government contracts.
• Manage billing for Time & Materials (T&M), Firm-Fixed-Price (FFP), Cost-Plus, IDIQ, and other government contract types.
• Review contracts, modifications, funding, CLINs, Schedules, and contractual billing requirements.
• Apply working knowledge of Federal Acquisition Regulation (FAR) as applicable.
• Reconcile labor, subcontractor, ODC, and other billable costs to contract requirements.
• Monitor contract funding, ceilings, billing limitations, and invoice status.
• Resolve invoice discrepancies, rejected invoices, and customer billing questions.

• Manage assigned accounts receivable portfolio and monitor outstanding government and commercial receivables.
• Perform timely collections activities through email, telephone, and other appropriate customer communications.
• Monitor aging reports and proactively follow up on past-due invoices.
• Investigate and resolve payment delays, invoice disputes, short payments, and customer account discrepancies.
• Maintain accurate customer account records and document collection activities.
• Reconcile customer accounts, cash receipts, credits, and outstanding balances.
• Coordinate with Billing, Contracts, Accounting, Program Managers, and customers to resolve collection issues.
• Escalate delinquent accounts and significant disputes to management as appropriate.
• Assist with cash application and ensure payments are properly applied to invoices.
• Track collection performance and identify trends or recurring billing issues that may impact cash flow.

• Bachelor's degree in Accounting, Finance, Business, or 5+ years of equivalent experience.
• 3+ years of experience in billing, accounts receivable, collections and project accounting.
• Experience supporting U.S. Government and Commercial contracts.
• Experience with Deltek Costpoint or comparable ERP/accounting systems
• Working knowledge of FAR
• Experience with T&M, FFP, Cost-Plus, IDIQ, or similar government contract types.
• Experience with accounts receivable aging, collections, cash application, and account reconciliation.
• Ability to interpret contracts and translate contractual requirements into billing procedures.
• Strong Excel skills and experience with ERP/accounting systems.
• Excellent attention to detail and problem-solving skills.
• Strong written and verbal communication skills.
• Ability to manage multiple contracts, customer accounts, and competing deadlines.

This position may require the ability to access to U.S. federal facilities. In accordance with the Department of Homeland Security’s enforcement of the REAL ID Act, as of May 7, 2025, individuals must present a REAL ID-compliant form of identification or an acceptable alternative to gain entry. For a list of acceptable forms of identification, please click here.

This position may involve access to technology or technical data that is controlled under U.S. export control laws and regulations and the release of which to a non US person may require an export license from the U.S. Government.

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ENSCO, Inc. and its wholly owned U.S. subsidiaries are Equal Opportunity Employers– veterans, disability