Staff Accountant II

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.

As a remote-first company, we require a minimum 25 Mbps consumer-grade broadband connection.

What You’ll Do

We are seeking a strategic and detail-oriented Procurement Manager to lead and mature our procurement operations as we continue scaling toward public-company readiness. This role sits within the Accounting organization and serves as a key bridge between technical stakeholders, operational teams, and Finance.
The ideal candidate will own and evolve our Procure-to-Pay (P2P) ecosystem, partnering cross-functionally with Engineering, Sales, Marketing, Security, Legal, FP&A, IT, and business leaders to ensure procurement requests are complete, business-justified, commercially sound, compliant, and operationally efficient from intake through payment resolution.
This role combines strategic sourcing, operational execution, process ownership, vendor coordination, and financial partnership. The ideal candidate thrives in high-growth environments, brings strong judgment and accountability, and can continuously improve procurement controls and workflows while enabling business velocity.

Responsibilities

• Design, implement, and oversee the end-to-end Procure-to-Pay (P2P) lifecycle, including procurement intake, purchase requisitions, PO issuance, vendor onboarding, invoice coordination, and procurement operations

• Serve as the operational owner of procurement workflows and systems, including guided procurement tooling and intake processes

• Review incoming purchase requests for completeness, business justification, coding accuracy, pricing support, department ownership, and appropriate payment methods before approval routing

• Coordinate procurement requests across FP&A, Legal, Security, IT, Engineering, Accounts Payable, and business stakeholders to ensure timely progression and resolution

• Monitor procurement SLAs, request aging, and operational bottlenecks to improve procurement speed, scalability, and reliability

• Identify opportunities to improve procurement operations through automation, AI-enabled workflows, document capture, operational reporting, and process optimization

• Establish and enforce company-wide procurement and spend policies to reduce non-compliant purchasing activity and strengthen budget accountability

• Ensure procurement activities align with SOX-readiness objectives and maintain organized documentation to support audit and IPO readiness requirements

• Work closely with FP&A to track actual spend against department budgets, providing variance analysis and forecasting insights

• Perform ongoing review of open purchase orders and procurement requests to determine whether they are still valid, whether goods or services have been received, and whether invoices are still outstanding, and if so, follow up with requesters and vendors to obtain invoices

• Review POs for closure opportunities, including partially used POs that no longer need to remain open, and close requests once remaining obligations are resolved.

• Help drive compliant remediation paths when spend is initiated outside the normal procurement flow, including ushering through an after-the-fact PO request where necessary.

• Lead monthly open-PO reviews to assess remaining commitments and determine the appropriate PO accruals to support month-end close

What You’ll Bring

• Must have experience managing procurement, sourcing, or Procure-to-Pay operations within a high-growth SaaS, cybersecurity, or technology environment

• Must have a strong understanding of procurement operations, vendor onboarding, purchasing controls, and cross-functional approval workflows

• Must have experience negotiating enterprise software agreements, cloud infrastructure contracts, and vendor commercial terms

• Must have working knowledge of procurement compliance, audit readiness, and SOX-oriented operational controls

Minimum Education and Experience

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

• 5+ years of experience in procurement, strategic sourcing, vendor management, or Procure-to-Pay operations

• Prior experience operating within a high-growth SaaS, cybersecurity, or technology organization

• Strong understanding of the "Accounting side" of procurement—accruals, GL coding, and the impact of contracts on the balance sheet.

Tech Stack Experience

• Procure-to-Pay (P2P) platforms such as Zip, Coupa, Airbase, or Tipalti

• ERP/accounting systems such as NetSuite or Sage Intacct

• Contract management and signature tools such as DocuSign

What Sets You Apart?

• You thrive in fast-moving environments and can manage a high volume of requests without sacrificing responsiveness or quality

• You know how to balance operational rigor with business velocity and stakeholder experience

• You communicate effectively across technical, operational, finance, legal, and vendor stakeholders

• You are highly organized and proactive, with strong follow-through on procurement and operational tasks

• You are comfortable working across ambiguity and helping improve processes as the company scales

• You have a strong operational mindset and naturally look for ways to improve workflow efficiency and process consistency

• Exposure to AI-enabled workflow improvement, OCR-based intake automation, or procurement analytics/reporting is a plus

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.

• Remote Work: We are a remote company. Enjoy the flexibility to work in the way that supports you and brings out your best.

• 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: $114,750 - $121,500. 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, 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.