Manager, Accounts Payable

AAON, Inc.•Tulsa, OK

About The Position

The Accounts Payable Manager oversees the full AP function across all invoice processing systems and teams, including Legacy (Accuterm), QuickBooks, and SAP, as well as the Vendor Master function. This role provides strategic direction, governance, and oversight for the entire procure to pay cycle, ensuring process integrity, strong internal controls, timely payment execution, and high-quality vendor data. The AP Manager is responsible for higher level issue resolution, audit readiness, establishing performance standards, and driving alignment across three AP Supervisors and their respective teams. This position does not perform invoice entry or vendor maintenance directly, but ensures that these processes are executed accurately, efficiently, and in accordance with company policy. Strategic Leadership & Oversight Provide direction and leadership for all AP functions across multiple platforms (Legacy/Accuterm, QuickBooks, SAP). Ensure consistency in processes, controls, documentation, and performance expectations across all teams. Lead coordination of AP operations to support business growth, system changes, and organizational priorities. Serve as the escalation point for complex, cross‑system AP issues. Vendor Master Governance Oversee vendor onboarding policies, controls, validation steps, and risk mitigation protocols. Ensure the Vendor Master Administrator adheres to strict accuracy, fraud‑detection, and compliance standards. Establish vendor data governance rules and maintain audit-ready vendor records. Internal Controls & Compliance Own the AP control environment, including user access, approval workflows, segregation of duties, and exception handling standards. Maintain documentation for policies, procedures, and control narratives. Serve as the primary liaison for internal and external audit requests related to accounts payable. Oversee adherence to GAAP, SOX-related controls (if applicable), and company financial policies. KPI Reporting & Operational Performance Develop, maintain, and present AP performance metrics, dashboards, and analytical reporting. Monitor invoice aging, exception trends, throughput, payment timing, accuracy, and other key metrics. Use KPI insights to identify systemic issues and implement process improvements. Payment Calendar & Payment Governance Own the AP payment calendar for all entities and systems. Ensure payments are scheduled, reviewed, and executed in accordance with policy. Coordinate cross-functional communication regarding payment cycles, deadlines, and process changes. Ensure proper controls exist around payment release — without releasing payments personally. Cross‑Functional Partnership Partner with Procurement, Operations, IT, Treasury, and Accounting to resolve cross‑departmental issues. Provide guidance during system upgrades, integrations, and workflow redesigns. Align AP processes with purchasing and receiving functions to reduce discrepancies and exceptions. Team Development Provide mentorship and coaching to AP Supervisors, building leadership capability and accountability. Establish training standards and ensure team members are equipped with the knowledge and tools required to perform effectively. At AAON, we are driven by a commitment to innovation and sustainability. Since 1988, we have been at the forefront of the HVAC industry, providing cutting-edge solutions for commercial and industrial indoor environments. Our dedication to designing and manufacturing highly configurable equipment ensures that we meet the exact needs of our clients, delivering unparalleled efficiency, performance, and long-term value. Join us in our mission to create a cleaner and more sustainable future.

Responsibilities

Provide direction and leadership for all AP functions across multiple platforms (Legacy/Accuterm, QuickBooks, SAP).
Ensure consistency in processes, controls, documentation, and performance expectations across all teams.
Lead coordination of AP operations to support business growth, system changes, and organizational priorities.
Serve as the escalation point for complex, cross‑system AP issues.
Oversee vendor onboarding policies, controls, validation steps, and risk mitigation protocols.
Ensure the Vendor Master Administrator adheres to strict accuracy, fraud‑detection, and compliance standards.
Establish vendor data governance rules and maintain audit-ready vendor records.
Own the AP control environment, including user access, approval workflows, segregation of duties, and exception handling standards.
Maintain documentation for policies, procedures, and control narratives.
Serve as the primary liaison for internal and external audit requests related to accounts payable.
Oversee adherence to GAAP, SOX-related controls (if applicable), and company financial policies.
Develop, maintain, and present AP performance metrics, dashboards, and analytical reporting.
Monitor invoice aging, exception trends, throughput, payment timing, accuracy, and other key metrics.
Use KPI insights to identify systemic issues and implement process improvements.
Own the AP payment calendar for all entities and systems.
Ensure payments are scheduled, reviewed, and executed in accordance with policy.
Coordinate cross-functional communication regarding payment cycles, deadlines, and process changes.
Ensure proper controls exist around payment release — without releasing payments personally.
Partner with Procurement, Operations, IT, Treasury, and Accounting to resolve cross‑departmental issues.
Provide guidance during system upgrades, integrations, and workflow redesigns.
Align AP processes with purchasing and receiving functions to reduce discrepancies and exceptions.
Provide mentorship and coaching to AP Supervisors, building leadership capability and accountability.
Establish training standards and ensure team members are equipped with the knowledge and tools required to perform effectively.