Accounts Payable Supervisor

Guardian Security Systems•Seattle, WA
•$31 - $36•Hybrid

About The Position

The Accounts Payable Supervisor leads and oversees the day-to-day operations of the Accounts Payable function, supervising AP clerk while remaining hands-on with processing, vendor compliance, and month-end activities. This role ensures invoices are processed accurately and timely, vendor records and tax documentation are properly maintained, and AP activity is reconciled and reported correctly to support a clean, on-time close. The role requires close collaboration with the Accounts Receivable and GL Accounting teams, as well as cross-functional coordination with payroll, purchasing, and compliance departments.

Requirements

  • Strong attention to detail and accuracy.
  • Excellent verbal and written communication skills.
  • Ability to problem-solve and work with little direction.
  • Excellent time management, planning and forward-thinking skills.
  • Has a positive and professional attitude.
  • Must be organized and detail oriented.

Nice To Haves

  • Associate's or Bachelor's degree in Accounting, Finance, or related field preferred; equivalent experience considered.
  • Minimum 4+ years of Accounts Payable experience, including at least 1–2 years in a lead or supervisory capacity.
  • Experience working with corporate credit card platforms and employee expense reimbursement and a strong interest in improving and optimizing system processes.
  • Strong understanding of the full AP cycle, including invoice workflows, vendor management, 1099 compliance and basic GL/reconciliation concepts.
  • Solid understanding of US GAAP and accrual accounting.
  • Strong Excel skills and comfort working with vendor and payment data.
  • Experience in the security, construction, or service-based industry is a plus.
  • Experience working with subcontractors is beneficial.

Responsibilities

  • Lead, mentor, and develop the AP team while establishing clear expectations, priorities, and accountability.
  • Continuously evaluate AP workflows and implement improvements that increase efficiency, accuracy, visibility, and scalability.
  • Perform two- and three-way matching, resolving price, quantity, tax, and receipt discrepancies before posting.
  • Reconcile agency credit card transactions and accounts payable activity by reviewing vendor statements, identifying discrepancies and ensuring timely resolution of differences.
  • Execute timely ACH, wire, and card payments in accordance with regulatory requirements and approval, segregation-of-duties, bank-change verification, and fraud-prevention controls.
  • Resolve escalated vendor inquiries, payment discrepancies, and disputed invoices.
  • Own vendor master file governance: new vendor setup, W-9 collection and validation, and ongoing maintenance of accurate vendor records.
  • Ensure proper 1099 classification throughout the year and manage year-end 1099 preparation and filing.
  • Partner with GL/accounting staff to ensure invoices are coded to the correct GL accounts and cost centers, escalating ambiguous coding questions rather than guessing.
  • Reconcile bank statements as necessary.
  • Reconcile the AP subledger to the GL control account monthly; research and resolve reconciling items.
  • Prepare and review AP aging and accrual schedules to support accurate month-end close.

Benefits

  • Low-cost Medical, Dental, and Vision insurance
  • Paid Time Off (PTO) that builds with tenure + Paid Sick Time (PSST)
  • 401(k) with company match after 1 year
  • Life Insurance premiums paid for by Guardian
  • AD&D insurance
  • Employee Assistance Program (EAP)
  • Flexible Spending Account (FSA)
  • Tuition reimbursement and paid professional development opportunities
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