• Prepare complex invoices using Excel in client-required formats. • Prepare detailed weekly and monthly reports in Excel using extensive WBS. • Review and QC actual vs projected hours and costs. • Obtain, print, and prepare invoice backup as requested. • Run WIP reports for assigned projects and review with Project Managers. • Run invoices using accounting software and submit by client-portal or email as required prior to date due. • Work with Contract Administrators to review invoices. • Work with Billing Manager to resolve past due AR. • Set-up and maintain electronic files on server. • Become familiar with billing terms and rates in contracts for assigned projects. • Reconcile WIP to identify billable costs, clear unbillable costs, and resolve outstanding discrepancies such as aged costs, incomplete transfers, etc. • Review invoice backup to ensure that timesheet, expense reports, and vendor invoices perfectly match invoiced costs by subtask and work with supervisor and corporate staff to effect changes needed. • Submit invoices to client by email or regular mail as required prior to date due. • Prepare detailed budget and billed-to-date tables in required work breakdown structure. • Coordinate with subcontractors to ensure that invoices are timely received, backup matches invoiced costs and correct rates are used. • Coordinate with company contract administrators, project managers and client as needed to provide timely responses to questions. • Other administrative duties as assigned.