Accounts Payable Supervisor

Accounts Payable Supervisor Salary: $142,171.12 - $181,322.96 Annually Location: King Street Center - 201 S Jackson St, Seattle, WA Job Type: Career Service (Exec) Job Number: 2026-27190 Department: DNRP-Natural Resources & Parks Division: Wastewater Treatment FLSA: Exempt Bargaining Unit: F5A : L117-WTD Finance & Admin Sec Sup Full- or Part-Time: Full Time Summary Wastewater Treatment Division's Finance section is hiring for an Accounts Payable Supervisor. Join one of the nation’s largest wastewater treatment agencies and lead the creation of a centralized accounts payable function in the Wastewater Treatment Division. This is a unique opportunity to shape a new team, establish efficient workflows, and ensure compliance while safeguarding ratepayer funds. You’ll work closely with WTD procurement staff and King County’s central procurement and payables teams to ensure accurate, timely payments that comply with our contracts, while safeguarding water quality, the environment, community resources, and supporting our equity and social justice objectives. About The Role This 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, and implement new strategies to reduce risk and ensure alignment with King County accounts payable and industry standards. They will also provide guidance and support to internal WTD customers on accounts payable needs and work closely with WTD’s procurement staff to ensure contract terms and conditions related to invoicing are followed. They will also work with other King County agencies, such as Procurement & Payables. This 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. About The Team The Accounting Unit within the Finance section is responsible for accounts receivable, revenue recognition, and associated audits; accounts payable; accounting for debt, capital assets, and capitalization policies; and the preparation of stand-alone financial statements in accordance with applicable accounting standards. The unit also manages and coordinates the annual external audit, ensuring timely, accurate, and transparent financial reporting and compliance with regulatory requirements. You will help lead a Finance & Administration section that provides services that include budget development & oversight, capital finance, procurement & contracts administration, technology services, central service administration (i.e. Division Fleet management), accounting, audit & compliance, rates & financial planning, payroll, and billing & accounts receivable. Commitment to Equity, Racial and Social Justice King County, named after Dr. Martin Luther King, Jr., is a diverse and vibrant community that represents cultures from around the world. Our True North is to create a welcoming community where everyone can thrive. We prioritize equity, racial and social justice, making it a foundational and daily expectation for all employees. In this role, you will actively apply these principles in all aspects of your work. Learn more about our commitment at Job Duties Supervise and lead the Accounts Payable (AP) team, including hiring, training, work assignment, performance management, and staff development. Oversee all AP operations, including invoice processing, purchase order matching, vendor setup and maintenance, payment approvals, P-Card administration, and employee reimbursements. Ensure accurate, timely, and compliant processing of payments in accordance with policies, regulations, and internal controls. Evaluate and improve AP processes through gap analysis; implement enhancements in collaboration with procurement and finance partners. Develop and maintain AP policies, procedures, and standard operating practices to strengthen internal controls, mitigate risk, and support audit readiness. Coordinate fiscal year-end close activities, including accruals, reconciliations, and cutoff procedures. Support internal and external audits by preparing documentation, responding to inquiries, and implementing corrective actions. Serve as the primary AP liaison to internal stakeholders, Central Payables, and vendors; resolve issues and ensure continuity of operations. Qualifications You Must Bring Supervisory & Leadership Experience Experience supporting and guiding a team, including participating in hiring and onboarding, providing coaching and feedback, assisting with performance management, 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. Competencies You Bring Customer Focus: Building strong customer relationships and delivering customer‑centric solutions. Communicates Effectively: Developing and delivering multi‑mode communications that convey a clear understanding of the unique needs of different audiences. Collaborates: Works cooperatively with others across the organization to achieve shared objectives. Represents own interests while being fair to others and their areas. Partners with others to get work done. Credits others for their contributions and accomplishments. Gains trust and support of others. Decision Quality: Making good and timely decisions that keep the organization moving forward. Manages Conflict: Handling conflict situations effectively, with a minimum of noise. Action Oriented: Taking on new opportunities and tough challenges with a sense of urgency, high energy, and enthusiasm. Ensures Accountability: Holding self and others accountable to meet commitments. Builds Effective Teams: Building strong‑identity teams that apply their diverse skills and perspectives to achieve common goals. Drives Engagement: Creating a climate where people are motivated to do their best to help the organization achieve its objectives. Courage: Stepping up to address difficult issues, saying what needs to be said. Instills Trust: Gaining the confidence and trust of others through honesty, integrity, and authenticity. Being Resilient: Rebounding from setbacks and adversity when facing difficult situations. Supplemental Information Remote and Onsite Work Details: The Accounting Unit works in a hybrid model, with days in the office as well as telecommuting. The ratio of remote to onsite work will be dependent on business needs and is subject to change. The primary onsite location is the Collaboration space at King Street Center, 201 S. Jackson, Seattle, Washington 98104. Employees must reside in Washington state and within a reasonable distance to their King County worksite to respond to workplace reporting requirements. King County has a robust collection of tools and resources to support working remotely. The individual selected for this opportunity will join an innovative and progressive team that is redefining how we work as we transition to the department's hybrid environment. Employees will be provided with a County‑issued laptop and must maintain a home workspace with an internet connection where they can reliably perform work and remain available and responsive during scheduled work hours. Work Schedule: This full‑time position works a 40‑hour work week, Monday – Friday. This position is exempt from the overtime provision of the Fair Labor Standard Act (FLSA) and is not overtime eligible. Union Representation Teamsters Local 117 – Wastewater Treatment Division, Supervisors. NOTE: Salary reflects $2.00 per hour contribution to the Western Conference of Teamsters Pension Trust. Equal Employment Opportunity Statement King County is an Equal Employment Opportunity (EEO) Employer. No person is unlawfully excluded from employment opportunities based on race, color, religion, national origin, sex (including gender identity, sexual orientation and pregnancy), age, genetic information, disability, veteran status, or other protected class. Our EEO policy applies to all employment actions, including but not limited to recruitment, hiring, selection for training, promotion, transfer, demotion, layoff, termination, rates of pay or other forms of compensation. #J-18808-Ljbffr