Procurement Manager

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 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, includin