Accounts Payable Supervisor

About The Role

Wastewater Treatment Division's Finance section is hiring for an Accounts Payable Supervisor. The role will lead a new team within the Wastewater Treatment Division (WTD) Finance section. The successful candidate will centralize the accounts payable function in Finance, identify gaps in WTD’s current processes, implement new strategies to reduce risk, and ensure alignment with King County accounts payable and industry standards.

They will provide guidance to internal WTD customers, work closely with WTD’s procurement staff to ensure contract terms related to invoicing are followed, and collaborate with other King County agencies such as Procurement & Payables. The role will assist in hiring and subsequently supervising a new team of accounts payable support staff. This position follows a hybrid work model, blending remote and in-person work.

The Accounting Unit within the Finance section handles accounts receivable, revenue recognition, audits, accounts payable, accounting for debt, capital assets, capitalization policies, and standalone financial statements in accordance with accounting standards. The unit also manages and coordinates the annual external audit, ensuring timely, accurate, and transparent financial reporting and compliance with regulatory requirements. The team provides budget development and oversight, capital finance, procurement & contracts administration, technology services, central service administration, accounting, audit & compliance, rates & financial planning, payroll, and billing & accounts receivable.

King County is committed to equity, racial and social justice, making it a foundational expectation for all employees. In this role, you will actively apply these principles in all aspects of your work.

• Supervisory & Leadership Experience
  • Experience supporting and guiding a team, including participating in hiring and onboarding, providing coaching and feedback, assisting with performance management, helping with work planning, and fostering staff development and mentorship.
  • Demonstrated ability to lead teams in a high-volume, deadline-driven environment while maintaining service quality, strong internal controls, and employee engagement.
• Accounts Payable Expertise
  • Experience in accounts payable operations within a large organization, including invoice review and processing, vendor setup and maintenance, payment authorization, P-Card administration, employee reimbursements, reconciliations, reporting, and compliance.
  • Demonstrated experience coordinating and leading fiscal year-end AP close activities, including accruals, reconciliations, and collaboration with accounting and central payables units.
• Internal Controls, Audit & Compliance Experience
  • Proven experience establishing and maintaining effective internal controls and ensuring compliance with federal, state, and local regulations, accounting standards, and audit requirements.
  • Experience supporting internal and external financial audits, including preparing documentation, responding to findings, and implementing corrective actions.
• Process Improvement & Operational Excellence
  • Demonstrated success leading process improvement initiatives and applying Lean or continuous improvement methods to strengthen internal controls, streamline workflows, improve timeliness, and enhance customer service.
  • Experience developing and maintaining policies, procedures, and standard operating procedures that promote consistency, accountability, and audit readiness.
• Collaboration and Stakeholder Engagement
  • Experience working collaboratively with internal partners to ensure accurate, timely, and compliant financial processing.
  • Ability to represent the Accounts Payable function as a subject matter expert to leadership, central finance partners, and auditors.
• Financial Systems and Reporting
  • Proficiency with enterprise financial systems with specific expertise in the Accounts Payable and General Ledger modules.
  • Experience using reporting and analytical tools to monitor workload, performance metrics, AP aging, and service levels.

• Custo…