Accounts Payable Analyst

Get to Know Us

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 entry, vendor communication, expense review, and transaction-level follow-up

• Experience working in AP, expense, or procurement systems such as Navan, Zip, Airbase, Bill.com, NetSuite, Sage Intacct, or similar tools

• High attention to detail and strong organizational skills, with the ability to manage recurring operational tasks accurately and consistently

• Strong written and verbal communication skills with the ability to work directly with vendors and employees regarding payment and expense questions

• Accounting knowledge, including familiarity with AP aging, accrual support, invoice processing, and expense coding

• Ability to work independently with strong ownership, accountability, and follow-through

Minimum Education and Experience

• Bachelor’s degree in Accounting, Finance, Business Administration, or a related field, or equivalent practical experience

• 2+ years of experience in Accounts Payable, accounting operations, expense operations, or procurement support

• Prior experience operating in a SaaS, technology, or cybersecurity environment preferred

• Experience supporting AP close activities, invoice processing, or operational accounting workflows

Tech Stack Experience

• Navan or similar travel and expense management platforms

• Procure-to-Pay (P2P) systems such as Zip, Airbase, Bill.com, or related tools

• ERP/accounting systems such as NetSuite or Sage Intact

What Sets You Apart?

• You are comfortable handling recurring operational tasks with accuracy and attention to detail

• You bring a strong customer-service mindset and communicate professionally with both vendors and internal employees

• You proactively follow through on routine issues and help ensure open items are resolved in a timely manner

• You are dependable, responsive, and comfortable working in a fast-moving, high-volume environment

• You are comfortable learning new systems, workflows, and operational processes

Perks ofHorizon3.ai

• Inclusive Team: We value diversity and promote an inclusive culture where everyone can thrive.

• Growth Opportunities: Be part of a dynamic and growing team with numerous career development opportunities.

• Innovative Culture: Work in a collaborative environment that encourages creativity and out-of-the-box thinking.

• Hybrid & Remote Work: We embrace a mix of remote and hybrid work models depending on role and location, including our Chicago office, where some roles require regular in-office presence.

• Competitive Compensation: We offer competitive salary, equity and benefits. Our benefits include health, vision & dental insurance for you and your family, a flexible vacation policy, and generous parental leave

Compensation and Values

At Horizon3, we believe that our people are our greatest asset, and our compensation philosophy reflects this core value. We are committed to fostering an environment where all employees feel valued, respected, and rewarded for their contributions. Our compensation structure is designed to be fair, competitive, and transparent, ensuring that every team member is recognized and compensated equitably across roles, levels, and locations.

In accordance with various State’s transparency regulations, we provide the following salary range information for this position:

• Base Salary: $93,500 - $ 110,000. The exact salary will be determined based on the selected candidate’s location, qualifications, experience, and relevant skills.

• Additional compensation: All full-time roles are eligible for an equity package in the form of stock options.

You Belong Here

Horizon3 is not just an equal opportunity employer, we are a community that values diversity, equity, and inclusion as fundamental principles of our culture and success. We are dedicated to fostering a workplace where everyone feels welcome and respected, regardless of race, color, religion, sex, national origin, age, disability, veteran status, sexual orientation, gender identity or expression, genetic information, marital status, hair length or any other legally protected status by law.

Our commitment to diversity and inclusion means we strive to attract, develop, and retain a workforce that reflects the varied communities we serve. We believe that diverse perspectives drive innovation and strengthen our ability to create cutting-edge cybersecurity solutions. At Horizon3, every team member is valued and supported in an environment that encourages personal and professional growth.

We welcome candidates from all backgrounds and experiences, and we encourage all qualified individuals to apply. Come be a part of Horizon3, where your unique contributions are recognized, and your potential is limitless.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee. Duties, responsibilities, and activities may change at any time with or without notice.