Sr. AP Manager

Senior Accounts Payable Manager

Co-Founder Roll-Up Environment | Multi-Entity | Multi-State | Sales Tax Expertise

About the Opportunity

We are seeking a highly motivated and hands-on Senior Accounts Payable Manager to lead and optimize the Accounts Payable function within a rapidly growing, co-founder based organization. This role is ideal for a proven AP leader who thrives in a fast-paced, acquisitive environment and has successfully managed the complexities that come with multi-entity operations, acquisitions, system integrations, and process standardization.  This is a role for someone who likes rapid change, enjoys working with a variety of personalities across multiple business units, and that isn’t easily flustered with changing competing priorities.

The Senior AP Manager will oversee all aspects of Accounts Payable across multiple legal entities and states, ensuring accuracy, compliance, scalability, and strong internal controls. This individual will serve as a key business partner to Finance & Accounting, Procurement, and to the Operations of our acquired business units.

Location: Remote

Reports To: Corporate Controller 

Key Responsibilities

Accounts Payable Leadership

• Lead and manage the day-to-day Accounts Payable operations across multiple business entities and locations.
• Develop, mentor, and manage AP staff while fostering a culture of accountability, continuous improvement, and customer service.
• Establish and maintain AP policies, procedures, best practices, and internal controls to support organizational growth.
• Ensure timely and accurate invoice processing, payment execution, vendor reconciliation, and month-end close support. This includes understanding the full AP spectrum from credit applications through vendor payment.
• Owning month-end cut-off and accounts payable process flow. This includes applying payments within accounts payable system and reconciling expense bank accounts.
• Responsible for overseeing invoice coding and syncing credit cards.

Board Support & Acquisition Integration

• Support a co-founder based growth strategy through acquisition onboarding and integration activities.
• Lead AP workstreams related to acquisitions, integrations, and business roll-ups.
• Standardize AP processes across newly acquired entities while maintaining compliance with local operational requirements.
• Partner with leadership teams to evaluate and implement process improvements and operational efficiencies.

Multi-Entity & Multi-State Compliance

• Manage AP operations across numerous legal entities and jurisdictions.
• Ensure compliance with state-specific regulations, reporting requirements, and internal governance standards.
• Oversee intercompany AP processes and related account reconciliations.

Sales & Use Tax / Retail Exemption Management

• Maintain expertise in multi-state sales and use tax requirements.
• Manage vendor sales tax compliance and exemption certificate administration.
• Ensure proper handling of retail exemption documentation and audit readiness.
• Partner with Accounting team to address sales tax questions, audits, and compliance matters.

Vendor Management

• Oversee vendor onboarding, new vendor setup, and vendor master file governance.
• Review and approve credit applications, credit references, and vendor account establishment documentation.
• Maintain strong vendor relationships while ensuring adherence to company policies and controls.
• Drive improvements in vendor payment processes and dispute resolution.

Systems & Process Improvement

• Lead AP-related ERP implementations, upgrades, integrations, and optimization initiatives.
• Participate in acquisition-related system conversions and data migration projects.
• Identify automation opportunities and implement best practices to improve efficiency and scalability.
• Collaborate with the GSP Brands, Finance, Operations, Procurement, and HR teams to streamline workflows and reporting.

Financial Close & Reporting

• Support month-end, quarter-end, and year-end close activities.
• Ensure AP accruals, reconciliations, and reporting are completed accurately and timely.
• Develop and monitor KPIs, dashboards, and reporting metrics related to AP performance.
• Assist with internal and external audits.

Qualifications

Required

• Bachelor's degree in Accounting, Finance, Business Administration, or related field.
• 8+ years of progressive Accounts Payable experience, including 3+ years in a leadership role.
• Demonstrated experience in a private equity-backed, co-founder based, acquisitive, and/or roll-up environment.
• Strong experience managing AP across multiple legal entities and multiple states.
• Deep understanding of sales tax compliance, use tax requirements, and retail exemption certificate management.
• Experience reviewing and managing credit applications, vendor onboarding, and vendor master maintenance.
• Proven success leading ERP implementations, system conversions, or AP automation initiatives.
• Advanced knowledge of AP controls, invoice processing, payment platforms, and month-end close procedures.
• Strong analytical, organizational, and problem-solving skills.
• Ability to manage multiple priorities in a dynamic, high-growth environment.
• Experience with ERP platforms such as Ramp, Sage, SAP, Oracle, NetSuite, Microsoft Dynamics, or similar systems.

Preferred

• Experience supporting growth organizations with multiple entities.
• Exposure to centralized accounts payable.
• Experience with acquisition integrations and post-merger process harmonization.
• Service, Construction, and/or HVAC Industry Support Experience

Why Join Us?

This is an opportunity to play a critical leadership role in a high-growth, co-founder backed organization where your expertise in AP operations, acquisition integration, compliance, and process improvement will directly influence the company's scalability and long-term success. You will work alongside senior leadership to build best-in-class financial operations while helping shape the future of a rapidly expanding enterprise.