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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.
We're looking for a Senior Brand Content Manager to tell Radiant's story across every channel. You'll draft social media posts for the company and executives, create presentation materials, manage development of visual assets, and build the content packages that accompany every milestone. This is a high-output role: you'll be writing and managing content for four distinct executive voices while maintaining consistency across the Radiant brand.
The ideal candidate combines strong writing skills with visual sensibility and the ability to translate complex technical concepts into compelling narratives. You understand that "nuclear" can come with baggage, and you know how to reframe the conversation around what microreactors actually are: small, safe, portable, and fundamentally different from the legacy plants people fear.
What You'll Do- Draft social media content for executives and the Radiant brand account, maintaining consistent presence across channels
- Create press materials including press releases, fact sheets, executive bios, FAQ documents, and backgrounders
- Develop milestone content packages for major announcements including visual assets, draft posts for investors, and media talking points
- Maintain brand consistency across all touchpoints—website, social, presentations, events, investor materials
- Write messaging frameworks for different audiences (defense, investors, policy, general public) and ensure all content aligns
- Manage external creative vendors (design, renderings, video) to produce high-quality visual assets
- Maintain the content calendar, coordinating timing across announcements, events, and evergreen content
- Support executive thought leadership, ghostwriting op-eds, blog posts, and long-form content
- 6+ years of experience in content marketing, brand communications, or corporate communications
- Exceptional writing skills with the ability to adapt voice for different executives and audiences
- Experience translating complex technical concepts into accessible, compelling narratives
- Strong visual sensibility—you can brief designers and provide useful feedback on creative
- Familiarity with social media best practices across major platforms
- Portfolio demonstrating range—from punchy social posts to polished long-form content
- Ability to work quickly and manage multiple projects with competing deadlines
- Experience in energy, aerospace, defense tech, or other "hard tech" sectors
- Background in journalism or editorial work
- Experience ghostwriting for executives
- Design skills (Figma, Canva) and basic photo and video editing capability
- Consistent social media presence across brand and executive accounts
- Content packages for every major milestone
- Updated messaging frameworks for each target audience
This is an exempt salaried role.
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: [email protected].
Benefits and Perks for Eligible Employees:
- Stock: Substantial incentive stock plan for all full-time employees.
- Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
- One Medical: Sponsored memberships for eligible employees and their dependents.
- Vision: 100% premium coverage for top tier plan + 50% for dependents.
- Dental: 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.
- Beautiful El Segundo headquarters close to the Pacific Ocean.
- Burgeoning satellite offices in Oak Ridge, TN and Washington, D.C., near Capitol Hill.
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.
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.
Top Skills
What We Do
Radiant is a clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.
Why Work With Us
Our world-class team has prior experience in complex hardware development from SpaceX, McMaster, The Boring Company, and renowned national laboratories that define our mentality to radically improve our microreactors. We care deeply about our mission to reduce carbon emissions, and have fun while doing so from trivia nights to ski retreats.
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