---
title: 'Accounts Payable Manager at Radiant Industries'
canonical: 'https://feeny.ai/job/accounts-payable-manager-radiant-industries-el-segundo-v3237ttjm8a1'
type: 'job'
last_seen: '2026-11-02'
---

# Accounts Payable Manager at Radiant Industries

- **Company:** [Radiant Industries](https://feeny.ai/companies/radiant-industries)
- **Location:** El Segundo, CA
- **Compensation:** $86k–$122k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-10-27
- **Last confirmed live:** 2026-11-02
- **Apply:** https://jobs.ashbyhq.com/radiant-industries/81441334-58af-4077-80b9-32b98eac9da7

## Job description

## About Radiant

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.

## About the Role

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.

Responsibilities & Duties: Invoice Processing & Management

- 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

Payment Processing & Vendor Management

- 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

Process & Controls

- 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

System Optimization & ERP Readiness

- 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

Compliance & Cross-Functional Partnership

- 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

Required Qualifications & Skills:

- 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

Desired Qualifications & Skills:

- 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

What We're Looking For: Ownership mentality: Takes full accountability for AP operations and proactively identifies improvements Builder mindset: Creates scalable processes rather than just executing existing ones Detail-oriented: Catches errors, maintains accuracy under volume pressure, and keeps clean records Systems thinker: Understands how AP connects to procurement, receiving, and financial reporting Adaptable: Thrives in an environment where systems are imperfect and processes are evolving Team player: Works effectively with Supply Chain, Engineering, and Finance partners Additional Requirements:

- Must be willing to work extended hours and weekends as necessary to accomplish our mission.
- Must work 100% onsite at El Segundo HQ.

## Benefits and Perks

- Stock: 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.
- Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.
- 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 Benefits Radiant 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: recruiting@radiantnuclear.com.

We 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. 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.

## About Radiant Industries

## Company Overview
- **One-liner**: Radiant Industries is building the world’s first mass‑produced, portable nuclear microreactor (Kaleidos) to replace diesel generators with zero‑emission, resilient power for remote sites, hospitals, data centers, and military installations.
- **Entity Type**: Private (Series D – $300M raised in December 2025, led by Lockheed Martin Ventures)
- **Headquarters**: El Segundo, California, USA
- **Founded**: 2020 (some sources list 2019)
- **Founders**: Not publicly disclosed

## Core Business
- **Primary industry**: Nuclear electric power generation / clean energy
- **Target customers**: B2B – remote communities, hospitals, data centers, military bases, industrial sites that currently rely on diesel generators or unstable grids
- **Mission**: To bring one of the world’s first factory‑constructed microreactors to market, providing portable, zero‑emissions power anywhere, anytime.

## Products & Services
- **[Kaleidos Microreactor](https://www.radiantnuclear.com/)**: A 1 MW electric / 1.9 MW thermal portable nuclear reactor packaged in a shipping container. It uses helium gas cooling and TRISO fuel (meltdown‑proof ceramic uranium particles). Delivered by truck or aircraft, installed without site excavation, and can reach full power the next day. After 5+ years the entire container is returned to the factory for refueling; up to four fuel cycles yield a 20‑year product lifetime. Customers purchase via Power Purchase Agreements (PPAs) or direct unit sales.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric**: Total funding raised – **$622.6M** (as of early 2026)
- **Notable Investors/Partners**: Andreessen Horowitz (led Series B), Lockheed Martin Ventures (led Series D), plus 18+ other investors across Series B, C, and D rounds
- **Growth Signals**:
  - Headcount grew **141% YoY** to 157 employees (as of mid‑2026)
  - 64 active job postings (+178% YoY)
  - Plans to test its development reactor in **2026** – which would be the first new commercial reactor design to achieve a fueled test in over 50 years
  - Initial customer deployments targeted for **2028**
  - SBIR Phase II awards from the U.S. Air Force for nuclear microreactor installation energy resilience

## Competitive Advantages
- **Portability & speed**: Delivered in a standard shipping container, installed in one day, no on‑site water or excavation needed.
- **Passive safety**: TRISO fuel is meltdown‑proof; the core is cooled by natural convection (air jacket) without pumps.
- **Factory‑built, factory‑refueled**: No nuclear waste or infrastructure left on site after the container is returned.
- **High energy density**: Over 110× the energy density of existing diesel systems.
- **Fleet monitoring**: Hundreds of units can be monitored 24/7 from a centralized control center.

## Strategic Focus
- Complete fueled testing of the Kaleidos prototype in 2026.
- Secure regulatory approvals (special nuclear material license, Part 7 license).
- Scale manufacturing for initial customer deployments beginning in 2028.
- Expand into military, commercial, and humanitarian markets (disaster relief, remote microgrids, backup power).

## Why Work Here
- **Culture & mission**: High‑impact climate tech – directly replacing diesel generators with clean nuclear power. Rated 5.0/5.0 on employer reviews (5 reviews) with strong scores for culture (4.7) and career growth (4.8).
- **Work location**: On‑site in El Segundo, CA (steps from the Pacific Ocean, near downtown). Employees work from a physical office.
- **Perks**: Company equity, relocation assistance, free daily meals, commuter benefits, onsite parking, generous parental leave, family medical leave, onsite Mother’s Room, dental/health insurance, FSA.
- **Diversity & inclusion**: Mandated unconscious bias training; hiring practices that promote diversity.
- **Tech stack**: React, TypeScript, Python, C++, C#, Kubernetes, Docker, PostgreSQL, AWS, Ansys, SolidWorks, Altium, and more. Engineers work on cutting‑edge nuclear, mechanical, and embedded systems.
- **Growth trajectory**: 141% headcount growth in the past year; 64 open roles across engineering, regulatory, supply chain, and operations.

## Sources
1. [radiantnuclear.com](https://www.radiantnuclear.com/) – Product details, specs, deployment model
2. [builtin.com](https://builtin.com/company/radiant) – Company overview, perks, culture, tech stack, reviews
3. [linkedin.com](https://www.linkedin.com/company/r-a-d-i-a-n-t) – Funding, headcount, employee growth, locations, key executives
4. [sbir.gov](https://www.sbir.gov/portfolio/1655711) – SBIR awards, Phase II contracts with U.S. Air Force
5. [jobs.ashbyhq.com](https://jobs.ashbyhq.com/radiant-industries) – Current open positions (64+)

## Other roles at Radiant Industries

- [Staff Turbomachinery Engineer](https://feeny.ai/job/staff-turbomachinery-engineer-radiant-industries-el-segundo-xepvcqf8gbzg) — El Segundo, CA
- [Supply Reliability Engineer](https://feeny.ai/job/supply-reliability-engineer-radiant-industries-el-segundo-wdh9vqfsjq0x) — El Segundo, CA
- [Buyer, Direct Commodities](https://feeny.ai/job/buyer-direct-commodities-radiant-industries-el-segundo-cftnmm6a4xf8) — El Segundo, CA
- [Associate Buyer](https://feeny.ai/job/associate-buyer-radiant-industries-el-segundo-hr2fv9dd58nt) — El Segundo, CA
- [Metrology Specialist](https://feeny.ai/job/metrology-specialist-radiant-industries-el-segundo-9zbycd225wtc) — El Segundo, CA
- [Manager of Quality Control](https://feeny.ai/job/manager-of-quality-control-radiant-industries-el-segundo-gtxb3kme06a3) — El Segundo, CA
- [Staff Structures Engineer](https://feeny.ai/job/staff-structures-engineer-radiant-industries-el-segundo-wqjgjtkddthf) — El Segundo, CA
- [Senior Mechanical Engineer, Structures](https://feeny.ai/job/senior-mechanical-engineer-structures-radiant-industries-el-segundo-rdv80etac7qx) — El Segundo, CA
- [Senior Civil Engineer, Concrete Structures](https://feeny.ai/job/senior-civil-engineer-concrete-structures-radiant-industries-el-segundo-ze493k9rmkpy) — El Segundo, CA
- [Senior Structural Engineer, Concrete](https://feeny.ai/job/senior-structural-engineer-concrete-radiant-industries-el-segundo-ndxqgbb7s20g) — El Segundo, CA