Executive Assistant & Office Coordinator

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.

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.

• 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

• 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

• 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

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

• 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.

• 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

• Must be willing to work extended…