Executive Assistant & Office Coordinator

About the role

Radiant is a fast‑growing startup developing portable nuclear microreactors. The company seeks an Executive Assistant to the Chief Nuclear Officer and Office Coordinator for its Washington, D.C. Government Affairs team, providing high‑level administrative support and a welcoming office environment.

Key responsibilities

• Manage the CNO’s complex calendar, travel arrangements, meetings with senior officials, press interviews, and global speaking engagements.
• Handle all communications on behalf of the CNO, both internal and external, virtual and in‑person.
• Perform office administration tasks such as filing, supply ordering, inventory management, tech set‑up, and catering coordination.
• Support People Operations with event logistics, recruitment scheduling, and candidate experience.
• Run the front desk, enforce security protocols, receive shipments, and manage mail and package tracking.
• Oversee third‑party contractors for budget and timeline compliance and plan large‑scale celebrations for 100+ guests.

Required profile

• Ability to balance multiple priorities across team calendars while maintaining professionalism.
• Proactive attitude, willing to tackle undefined projects and work independently in a dynamic environment.
• Positive attitude and willingness to work extended hours and weekends as needed.
• Physical capability to lift ~50 lb loads and assemble basic furniture.

Required skills

• Strong organizational and calendar‑management skills.
• Excellent verbal communication and interpersonal skills.
• Experience with office administration, budgeting, and vendor coordination.

What we offer

• Substantial equity plan for all full‑time employees.
• Comprehensive medical, vision, dental, and life benefits with high employer contribution.
• 8‑week paid parental leave, flexible PTO, and daily catered lunch.
• Beautiful El Segundo headquarters near the Pacific Ocean and occasional remote workdays.