Accounts Payable Manager

Radiant is seeking an AP Manager to own our end-to-end accounts payable operations. We process 800-1,300 invoices monthly across fragmented systems (QuickBooks, ION, and Ramp) with no automatic integration or three-way match. This role will manage the full invoice-to-payment cycle, build scalable AP infrastructure, and establish the controls and processes needed to support our growth from prototype development through production ramp.This is a hands-on role with significant ownership. You'll process high volumes while simultaneously building the systems, controls, and documentation that will scale with the company. You'll partner closely with Supply Chain on procurement workflows and with Finance leadership on cash management strategy and ERP implementation planning.ResponsibilitiesInvoice Processing & ManagementProcess 800-1,300+ invoices monthly across QuickBooks, ION, and RampReview, code, and approve invoices ensuring proper GL account assignment, project codes, and class accountingPerform manual three-way matching across disconnected systems until ERP implementationHandle employee and candidate reimbursements, corporate card reconciliations, and ad-hoc payment requestsManage vendor setup, W-9 collection, and vendor master data maintenancePayment Processing & Vendor ManagementExecute payment runs to capture early payment discounts and avoid late penaltiesServe as primary point of contact for 150+ active vendors; resolve inquiries, disputes, and statement reconciliationsCoordinate with Procurement on vendor onboarding, contracts, and payment termsMonitor aging reports and resolve payment holds or exceptionsProcess & ControlsBuild scalable AP infrastructure with automations where possibleDesign and document AP policies, procedures, and workflows for a scaling organizationImplement approval matrices, segregation of duties, and fraud prevention controlsBuild audit-ready documentation and support external auditsSystem Optimization & ERP ReadinessMaximize functionality of existing tools: Ramp Pro automation, ION workflows, QuickBooks coding rulesDocument current-state processes and pain points to inform 2026 ERP requirementsLead AP workstream for ERP selection, implementation, and data migrationCompliance & Cross-Functional PartnershipMaintain 1099 vendor tracking and support sales/use tax compliance and annual filingsPartner with Supply Chain and Receiving on purchase order workflows and vendor managementTrain employees on policies, Ramp usage, and invoice submission requirementsRequired Qualifications5+ years of accounts payable experience, with at least 2 years in a senior or lead AP roleExperience processing high-volume AP (500+ invoices/month) in a fast-paced environmentProficiency with AP automation tools and ERP systemsStrong understanding of three-way match processes, GL coding, and month-end close proceduresExperience with 1099 reporting, sales/use tax compliance, and audit supportTrack record of building or improving AP processes and controlsExcellent attention to detail and ability to manage competing prioritiesStrong communication skills for vendor management and cross-functional collaborationDesired QualificationsHardware, manufacturing, or aerospace/defense industry backgroundExperience with government contract accounting (FAR/DFARS)Familiarity with Ramp, QuickBooks, and/or IONExperience supporting ERP implementations or system migrationsSQL or reporting tool proficiency for building AP analyticsExperience in high-growth companies navigating significant scaleWhat We're Looking ForOwnership mentality: Takes full accountability for AP operations and proactively identifies improvementsBuilder mindset: Creates scalable processes rather than just executing existing onesDetail-oriented: Catches errors, maintains accuracy under volume pressure, and keeps clean recordsSystems thinker: Understands how AP connects to procurement, receiving, and financial reportingAdaptable: Thrives in an environment where systems are imperfect and processes are evolvingTeam player: Works effectively with Supply Chain, Engineering, and Finance partnersAdditional RequirementsMust be willing to work extended hours and weekends as necessary to accomplish our mission.Must work 100% onsite at El Segundo HQ.Benefits and PerksStock: Substantial incentive stock plan for all full-time employees.Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.One Medical: Sponsored memberships for employees and their dependents.Vision: 100% top tier plan coverage + 50% for dependents.Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.Daily catered lunch. Free snacks and drinks.Flexible PTO policy. Remote workday allocation.Company and team-bonding events, happy hours and in-person camaraderie.Beautiful El Segundo headquarters close to the Pacific Ocean.Total Compensation and BenefitsRadiant compensates people for impact and invests in those who continue to raise the bar. Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.The best of today's advanced reactor builders don't wait for job postings. They join the winning team. If that's you, contact us directly for immediate opportunities: [email protected] are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.Unfortunately, we are unable to provide visa sponsorship at this time.This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant's capacity to serve in compliance with U.S. export controls.

Created: 2026-04-02