Senior Brand Content Manager

Radiant • El Segundo, CA

9d • $150,000 - $190,000

About The Position

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.

Requirements

• 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

Nice To Haves

• 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

Responsibilities

• 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

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Education Level: No Education Listed