Accounts Payable Supervisor

Valar Atomics•Hawthorne, CA

About The Position

The Company At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable—unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level. The Role We are looking for an experienced Accounts Payable Supervisor lead our AP team and the end-to-end payables cycle. You will play an active role in shaping how the function operates as we scale. In the near term the focus will be on building strong foundations — strengthening processes, building strong relationship with our vendors, and driving performance.

Requirements

Associate’s or Bachelor's degree in Accounting, Finance, Business Administration, or a related field.
5+ years of accounts payable experience in a fast-paced, high-growth environment, with 2+ years in a supervisor role
Experience with Purchase Orders, 2 and 3-way matching controls
strong interpersonal and communication skills, with the ability to manage vendor and internal stakeholder relationships
Strong understanding of AP processes, controls, and GAAP principles
Proficiency with major ERP and payable platforms (BILL, Ramp, NetSuite, Oracle, SAP,etc.)
Excellent attention to detail and organizational skills

Nice To Haves

Familiarity with 1099 reporting and sales/use tax requirements
Experience supporting external audits and diligence requests
Background in high-volume AP environments (100+ invoices/week and growing)
Experience with AP automation and tool implementations
Exposure to multi-entity and multi-currency operations

Responsibilities

Oversee end-to-end AP operations, including invoice receipt, coding, 3-way matching, approval routing, vendor communications, and payment disbursement, ensuring accuracy and timeliness across all payment methods
Manage the employee expense reimbursement process, ensuring timely processing and compliance with the company's travel and expense policy
Review and approve AP transactions and journal entries within delegated authority limits
Own vendor master data integrity, including onboarding, ongoing maintenance, and timely resolution of escalated disputes and payment discrepancies
Oversee W-9 collection, 1099 preparation, and sales/use tax compliance on applicable purchases
Lead the AP contribution to the monthly close process, including accruals, account reconciliations, and financial reporting to the Controller
Monitor and report on key AP metrics — including invoice cycle time, on-time payment rate, aging, and processing bottlenecks — identifying trends and escalating risks to management
Design and enforce internal controls and segregation of duties, ensuring compliance with company policy, regulatory requirements, and audit standards; support internal and external audit requests as needed
Identify and implement process improvements to increase efficiency, reduce errors, and shorten invoice cycle times; support system implementations, upgrades, and integrations related to AP and payment platforms
Collaborate cross-functionally with Procurement, Treasury, and Finance to continuously improve procure-to-pay workflows
Provide day-to-day guidance and mentorship to AP staff, supporting their development and ensuring consistent adherence to procedures
Maintain a “no job too small” mentality, contributing to special projects and cross-functional initiatives as needed within the general scope of the role.