• Review and interpret complex government and commercial contracts terms and conditions to ensure billing accuracy and compliance. • Assist in creating and maintaining contract funding and billing logs to include balancing them using Excel and Costpoint. • Create and maintain electronic and hardcopy billing files; ensure documentation meets audit and regulatory requirements. • Analyze unbilled detail and reconcile accounts for accuracy and reasonableness of expenses before invoice is processed. • Prepare, review, and submit complex large volume invoices batched, ensuring accuracy and compliance with contract terms and company policies, while including required backup and within the contract department deadlines. • Prepare and submit accurate invoices using Wide Area Workflow (WAWF) or other customer-designated methods. • Work with accountants, project managers, and Billing Specialist Lead, at both corporate and subsidiary levels, to resolve issues and implement approved corrective actions. • Assist in monitoring unbilled receivables and recommend adjustments. • Verify billing accounts against accounts receivable ledger to ensure that all payments are accounted for and properly posted. • Identify billing discrepancies and propose solutions to the Billing Specialist Lead; implement adjustments only as directed. • Generate and interpret accounts receivable aging reports. • Generate and provide billing-related reports to subsidiaries, clients, and joint venture partners as required. • Provide support and documentation of efforts to collect past-due receivables utilizing the Accounts Receivable Collection and Write-off Forms. • Provide support for internal and external audits, including DCAA voucher reviews, by supplying necessary documentation and explanation. • Support the Billing Specialist Lead in maintaining contract-specific billing procedures using the Billing Processes Template. • Ensure all billing activities comply with external regulations, industry standards and internal guidelines. • Work in a constant state of alertness and in a safe manner. • Perform other duties as assigned.