---
title: 'Executive Assistant & Office Coordinator at Radiant Industries'
canonical: 'https://feeny.ai/job/executive-assistant-office-coordinator-radiant-industries-washington-587stxsr4v2m'
type: 'job'
last_seen: '2026-10-12'
---

# Executive Assistant & Office Coordinator at Radiant Industries

- **Company:** [Radiant Industries](https://feeny.ai/companies/radiant-industries)
- **Location:** Washington, DC
- **Compensation:** $74k–$122k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-10-09
- **Last confirmed live:** 2026-10-12
- **Apply:** https://jobs.ashbyhq.com/radiant-industries/59834c71-b2db-4d4c-82aa-7cb6a9529f97

## Job description

## About Radiant

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Executive Assistant to the Chief Nuclear Officer & DC Office Coordinator

Radiant’s goals are ambitious – we will be the first company to mass-produce portable nuclear reactors. We have world-class engineers designing our Kaleidos 1MW microreactor, and we need a world-class team to build our business. Radiant is looking for a bright and eager executive assistant and office coordinator to join our Government Affairs team in DC and be a welcoming, friendly host to all visitors entering our office.

Responsibilities & Duties: Executive Assistant to the Chief Nuclear Officer (CNO)

- Manage CNO’s dynamic schedule, including frequent domestic and international travel, external meetings with high-profile officials, interviews with the press, and worldwide speaking engagements
- Become familiar with Radiant’s wide-spanning public and private sector network and balance the CNO’s priorities across external stakeholder engagements and internal projects
- Attend calls with event organizers on behalf of the CNO
- You will often represent the CNO and the wider company – handle all communications and engagements (internal & external, virtual & in-person) with respectful professionalism

Office/Administrative

- Assist with various office administration tasks (filing, supply ordering, restocking, inventory, tech set-up, and supplies organization)
- Order catering and supplies for meetings, team engagement events, conferences, etc.
- Assist People Operations (HR) with onsite event logistics, recruitment scheduling, and candidate experience
- Spearhead ad-hoc office, administrative, or analytics tasks
- Be the team culture creator: plan team happy hours, lunches, outings, etc.
- Manage a monthly office budget and stay on top of expenses

Run our reception desk/front office, including:

- Create a welcoming front-office experience for staff, visitors, and our community
- Facilitate the visitor experience while enforcing critical security protocols
- Direct vendors, contractors, and freight deliveries
- Answer phone calls

Shipping & Receiving

- Receive mail and deliveries, and track items in our inventory software
- Ship packages and drop-off/pick-up at the post office, FedEx, or UPS

Project Management

- Manage 3rd party contractors, responsible for both budget and timeline
- Plan widely attended celebrations for 100+ guests 2-3 times per year: venue booking, catering, decoration, guest list & invitations, etc.

Required Skills and Qualifications

- Ability to balance a myriad of priorities and coordinate across team calendars while maintaining professionalism
- Inclination to raise your hand to tackle projects, even when you feel underprepared and/or the scope isn’t clearly defined
- Ability to work independently in a very dynamic environment
- Knowing when to pick up the phone and have a live conversation – for the sake of efficiency, clarity, tension diffusion, etc.
- Positive attitude

Additional Requirements

- Must be willing to work extended hours and weekends as necessary to accomplish our mission
- Ability to lift ~50 lb loads, build basic furniture, walk up and down stairs

## 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.
- 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

- [Mechanisms Engineer](https://feeny.ai/job/mechanisms-engineer-radiant-industries-el-segundo-k6b336c99d6n) — El Segundo, CA
- [Reactor Operations Engineer](https://feeny.ai/job/reactor-operations-engineer-radiant-industries-el-segundo-bqdf0nbd2byh) — El Segundo, CA
- [Indirect Procurement Associate](https://feeny.ai/job/indirect-procurement-associate-radiant-industries-el-segundo-88rxwtyxe1ja) — El Segundo, CA
- [Strategic Sourcing Manager](https://feeny.ai/job/strategic-sourcing-manager-radiant-industries-el-segundo-dnr7vm0d3fqv) — El Segundo, CA
- [Supply Chain Associate](https://feeny.ai/job/supply-chain-associate-radiant-industries-el-segundo-hr2fv9dd58nt) — El Segundo, CA
- [Senior Material Planner](https://feeny.ai/job/senior-material-planner-radiant-industries-el-segundo-t3v7gd7e4pw5) — El Segundo, CA
- [Staff Manufacturing Engineer, DFM](https://feeny.ai/job/staff-manufacturing-engineer-dfm-radiant-industries-el-segundo-k8877pb0k2ac) — El Segundo, CA
- [Senior Manufacturing Engineer, DFM](https://feeny.ai/job/senior-manufacturing-engineer-dfm-radiant-industries-el-segundo-hzrkyha5we4b) — El Segundo, CA
- [Staff Nuclear Engineer](https://feeny.ai/job/staff-nuclear-engineer-radiant-industries-el-segundo-xj3a1h5w0dvf) — El Segundo, CA
- [Indirect Procurement Manager](https://feeny.ai/job/indirect-procurement-manager-radiant-industries-el-segundo-xvg0ber6d94z) — El Segundo, CA