Accounting Specialist – Accounts Receivable

Active Security Consulting•Sterling, VA

About The Position

Active Security designs, develops, implements, and sustains advanced C5ISR and security solutions for Mission Critical Commercial and U.S. Government clients. The Accounting Specialist – Accounts Receivable owns the billing-to-cash cycle for assigned projects and customer accounts, ensuring invoices are accurate, timely, and consistent with contract terms. The role applies cash receipts, maintains A/R aging, leads collection follow-up, and ensures customer contracts are set up correctly in the accounting system for scheduled billing. It reports directly to the Finance Department lead and works with project and program managers, contracts staff, and the finance team to resolve billing issues, reconcile customer accounts, and support month-end close. The position is accountable for accurate A/R records, revenue-recognition support, and the billing side of project P&Ls for assigned projects. The role uses PROCAS and ConnectWise to prepare and issue milestone, progress, time-and-materials, and recurring agreement invoices. It also supports government and commercial customer portal submissions, cash application, account reconciliation, collections, customer and contract setup, financial reporting, and close activities. The employee must manage multiple priorities while maintaining accuracy and confidentiality. Work is primarily office-based, with standard business hours and flexibility to support deadlines and other business needs.

Requirements

High school diploma or equivalent required.
At least 3–5 years of accounting experience, including at least 2 years focused on accounts receivable, billing, or collections.
Proficiency in Microsoft Office, particularly Excel, and experience with accounting or ERP software.
Strong understanding of the order-to-cash cycle, cash application, and A/R reconciliation.
Ability to read contracts and POs to identify billing terms, spot discrepancies, and maintain accurate records.
Confident, professional communication with customers regarding collections and disputes.
Ability to work with project managers to obtain billing information on time.
Ability to work independently and collaboratively while managing multiple priorities and meeting deadlines.
Ability to work standard business hours, with flexibility for critical accounting deadlines, month-end close, audits, and other business needs.
Strong oral and written communication skills for interacting with peers, supervisors, and clients.
Detail-oriented analytical skills, including the ability to diagnose and solve problems.
Must pass a background check, have a valid driver’s license, and be eligible for U.S. Government Security Clearance.
Maintain professionalism, organizational skills, accuracy, attention to detail, and confidentiality of financial information.

Nice To Haves

Associate’s degree in Accounting, Finance, Business Administration, or a related field.
Experience with project-based or contract billing.
Government contract billing experience, including WAWF/PIEE and progress or milestone billing.
Commitment to ongoing learning and development related to accounting practices, financial regulations, and accounting software applications.

Responsibilities

Prepare, review, and issue customer invoices from PROCAS and ConnectWise, including milestone, progress, time-and-materials, and recurring agreement billing.
Work with Program Managers to confirm billing schedules, percent complete, and billable time and materials before invoicing.
Submit government invoices through customer portals such as WAWF/PIEE and commercial customer portals as required.
Apply customer payments by check, ACH, wire, and credit card, and reconcile deposits to bank activity.
Maintain the A/R aging and conduct regular aging reviews with the finance lead and project teams.
Lead collection activities, including payment reminders, statements, past-due follow-up, and escalation of at-risk accounts.
Research and resolve billing disputes, short-pays, credits, and unapplied cash.
Set up new customers and contracts in company systems, including billing contacts, credit terms, tax status, and PO/contract values.
Track customer POs and contract funding against billings, and flag low remaining funding or periods of performance.
Reconcile the A/R subledger to the general ledger and support month-end and quarter-end close, audits, and cash forecasting.
Prepare A/R reports for finance leadership, including aging, DSO, collections forecasts, and unbilled revenue.
Provide backup support for A/P, expense reporting, and credit card reconciliation as needed.
Perform data entry and quality control for billing and customer records across company systems.
Review unbilled revenue and billing milestones at least monthly to ensure billable work is not missed.