About the role
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.
About
the Role We recently closed a oversubscribed $350M Series D at a $1.8B valuation, backed by Andreesen Horowitz, DCVC, Boost Ventures, Draper Associates, Chevron Tech Ventures, Founders Fund, IQT, LM Ventures and others. We’ve grown to north of 200 people this year and we are just getting started. Radiant is hiring a Director of Investor Relations to build and lead this function from the ground up. This is a senior, high-visibility role reporting directly to the CFO and working closely with the CEO and Board. You will own the full investor lifecycle — from prospecting and diligence support through ongoing relationship management — across multiple investor types. This role sits at the intersection of finance, strategy, communication, and capital markets. You will be a key architect of how Radiant presents itself to sophisticated capital allocators and how we manage and grow our investor ecosystem over time.
What You'll Own : Investor Strategy Build the IR function from the ground up: Own the strategy, messaging, materials, and reporting cadence across our existing and prospective investor base. Build and maintain a structured investor prioritization framework across multiple investor segments. Develop deep knowledge of investor thesis fit, sector appetite, and decision-making dynamics. Maintain intelligence on market dynamics and capital market trends in nuclear, energy, advanced technology. Capital Markets Execution Partner with the CFO and Executive team to support any financing processes including materials development, logistics, diligence coordination, and investor Q&A. Prepare and maintain core IR materials: investor presentations, data room, financial models, one-pagers, FAQs. Ongoing Investor Relations Serve as a key point of contact for existing investors: manage quarterly update cadence, information-share rhythms, and ad-hoc communications. Deepen relationships: keep existing investor close, field inquiries, manage communications, and surface opportunities across our sophisticated cap table. Partner with CFO and exec team to prepare board meeting materials and investor updates. Help develop a scalable IR infrastructure: reporting frameworks, disclosure processes, investor day planning, and materials management. Shape the narrative: advise on investor narrative and messaging as the company scales through key milestones, translate financial performance, product velocity, and market position into a compelling, consistent story. Strategic Communications Partner with Marketing team to ensure investor-facing narrative is consistent with brand, product, and policy positioning. Identify and manage relevant speaking opportunities, investor conferences, and industry forums.
