Accounts Receivable & Billing Specialist (Contractor)

Mannix Marketing is a fully remote digital marketing and web development agency based in Upstate New York. We are looking for an experienced AR and billing contractor to support our CFO and accounting team on a part-time basis. This is a recurring engagement with consistent monthly deadlines and a defined set of tasks. The right person is highly proficient in QuickBooks Online, works independently without daily oversight, and communicates proactively when issues arise.

What You’ll Do

• Manage past-due accounts through the QBO Collections Center, including weekly customer outreach, statement distribution, and response to customer replies

• Record all incoming payments in QBO (paper checks, Authorize.net e-checks, and credit card payments) and make corresponding deposits

• Run recurring billing reports, distribute to managers on schedule, and handle new customer billing, changes, and cancellations in QBO as needed

• Set up and maintain Automated Recurring Billing (ARBs) and recurring transactions, including price updates

• Enter vendor and contractor bills into the QBO Vendor Center; collect and file W-9s; enter referral partner commissions for CFO processing

• File employee credit card receipts and enter charges into QBO

• Prepare monthly, quarterly, and other reports as needed, such as, but not limited to, the Tourism billing report, Sales Tax Quarterly Gross Up Report, and ad spend reconciliation

• Enter end-of-month commission data and perform commission sheet audits

• Enter scorecard data and complete NYS Contract System audits as needed

• Audit domain names and Google accounts billed through Mannix; confirm they are memorized and invoiced

• Participate in periodic check-ins with the finance team as needed

• Document billing activities and client updates in the company CRM (Admin)

• 3+ years of hands-on QuickBooks Online experience, including custom report creation, recurring and memorized transactions, the Collections Center, Automated Recurring Billing (ARBs), and Vendor Center Management

• Proficient in Google Drive and Google Sheets, including formula creation and data organization

• Direct accounts receivable experience with customer-facing collections work

• Able to manage a recurring, deadline-driven task load independently

• Strong attention to detail; follows up on discrepancies without being prompted

• U.S.-based and legally authorized to work in the United States

• Consistent weekly availability

• Remote

• $20/hour DOE

• Part-time, approximately 4-6 hours per day with potential for additional hours