Accounts Payable Analyst

GET TO KNOW US Horizon3.ai http://Horizon3.ai is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find, fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZero™ platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by IT Ops/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers & operators, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools and false positives, resulting in alert fatigue, blind spots, “checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results. WHAT YOU’LL DO We are seeking a detail-oriented and service-minded AP Analyst to support the day-to-day execution of Horizon3’s accounts payable operations and help scale a clean, responsive procure-to-pay process as the company grows. This role is highly operational and focused on invoice processing, vendor communication, expense review, and operational follow-through across the systems and workflows that keep Accounts Payable moving efficiently. The ideal candidate thrives in a fast-moving SaaS and cybersecurity environment, brings strong attention to detail, and is comfortable coordinating across Accounting, Procurement, employees, and external vendors. This role will play an important part in ensuring invoices move efficiently through the correct workflows, employee T&E activity is reviewed consistently, vendors receive timely communication, and AP reporting and close processes remain organized and accurate. RESPONSIBILITIES - Process vendor invoices accurately and timely within AP and procurement systems, ensuring invoices are properly supported, coded, approved, and routed correctly for processing - Review invoice submissions for key details including vendor information, invoice dates, coding, PO linkage, and supporting documentation before processing or escalation - Support AP shared inbox management by routing invoices, identifying missing information, and coordinating follow-up with vendors and internal stakeholders - Respond to vendor inquiries regarding payment status, invoice receipt, remittance updates, and general AP-related questions - Follow up with vendors and employees to obtain corrected invoices, missing receipts, supporting documentation, or updated banking information as needed - Perform daily review of Navan expense activity to ensure transactions are properly supported, coded, and compliant with company policy - Support employees with expense-related questions and follow-up - Support AP aging review, unpaid invoice follow-up, month-end close activities, and accrual support processes - Maintain organized, audit-ready documentation for invoices, approvals, payment communications, vendor records, and expense support - Assist with vendor setup and payment method maintenance, including updates to remittance details and vendor master data - Support process improvements across AP, expense, and procurement workflows to improve efficiency, accuracy, and turnaround times - Demonstrate strong attention to detail, responsiveness, operational accuracy, and customer service in day-to-day AP operations WHAT YOU’LL BRING - 2+ years of accounts payable, expense operations, procurement support, or related accounting operations experience, ideally in a high-growth SaaS or technology company - Experience with invoice entr