Radiant · 19 hours ago
Accounts Payable Manager
El Segundo, CA
Full-time
Onsite
Senior Level
5+ years expRadiant is a startup based in El Segundo, CA that is developing portable nuclear microreactors. They are seeking an Accounts Payable Manager to oversee their accounts payable operations, manage invoice processing, and build scalable AP infrastructure to support the company's growth.
Clean EnergyEnergyEnergy EfficiencyRenewable Energy
No H1B
Responsibilities
Process 800-1,300+ invoices monthly across QuickBooks, ION, and Ramp
Review, code, and approve invoices ensuring proper GL account assignment, project codes, and class accounting
Perform manual three-way matching across disconnected systems until ERP implementation
Handle employee and candidate reimbursements, corporate card reconciliations, and ad-hoc payment requests
Manage vendor setup, W-9 collection, and vendor master data maintenance
Execute payment runs to capture early payment discounts and avoid late penalties
Serve as primary point of contact for 150+ active vendors; resolve inquiries, disputes, and statement reconciliations
Coordinate with Procurement on vendor onboarding, contracts, and payment terms
Monitor aging reports and resolve payment holds or exceptions
Build scalable AP infrastructure with automations where possible
Design and document AP policies, procedures, and workflows for a scaling organization
Implement approval matrices, segregation of duties, and fraud prevention controls
Build audit-ready documentation and support external audits
Maximize functionality of existing tools: Ramp Pro automation, ION workflows, QuickBooks coding rules
Document current-state processes and pain points to inform 2026 ERP requirements
Lead AP workstream for ERP selection, implementation, and data migration
Maintain 1099 vendor tracking and support sales/use tax compliance and annual filings
Partner with Supply Chain and Receiving on purchase order workflows and vendor management
Train employees on policies, Ramp usage, and invoice submission requirements
Qualification
Required
5+ years of accounts payable experience, with at least 2 years in a senior or lead AP role
Experience processing high-volume AP (500+ invoices/month) in a fast-paced environment
Proficiency with AP automation tools and ERP systems
Strong understanding of three-way match processes, GL coding, and month-end close procedures
Experience with 1099 reporting, sales/use tax compliance, and audit support
Track record of building or improving AP processes and controls
Excellent attention to detail and ability to manage competing priorities
Strong communication skills for vendor management and cross-functional collaboration
Preferred
Hardware, manufacturing, or aerospace/defense industry background
Experience with government contract accounting (FAR/DFARS)
Familiarity with Ramp, QuickBooks, and/or ION
Experience supporting ERP implementations or system migrations
SQL or reporting tool proficiency for building AP analytics
Experience in high-growth companies navigating significant scale
Benefits
Substantial incentive stock plan for all full-time employees.
100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
Sponsored memberships for eligible employees and their dependents.
100% premium coverage for top tier plan + 50% for dependents.
100% premium coverage for top tier plan (including orthodontia) + 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.
Company
Radiant
Radiant develops portable nuclear microreactors designed to generate electricity and heat in a compact, factory-built form.
51-200 employees
Funding
Current Stage
Late StageTotal Funding
$518.82MKey Investors
Andreessen HorowitzUnion Square Ventures
2025-12-17Series D· $300M
2024-11-14Series C· $165M
2023-04-18Series B· $40M
Leadership Team
Doug Bernauer
Chief Executive Officer
Recent News
alleywatch.com
2026-01-23
2026-01-07
The Motley Fool
2026-01-04
Company data provided by crunchbase