Chief of Staff

Job Description

Job Description

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.

Chief of Staff to the Chief Nuclear Officer (Government Affairs)

Location: Washington, DC
Travel: ~10%

We are hiring a Chief of Staff to the Chief Nuclear Officer to help drive our regulatory affairs strategy and execution, as well as stakeholder engagement. This role acts as a deputy to the CNO, operating at the center of our work with government agencies, regulators, and policymakers.

You will help turn strategy into action. That means aligning teams, driving priorities, tracking progress, and ensuring nothing crucial slips. You will work across licensing, policy, regulatory, and communications efforts to keep momentum high and execution tight.

This role is best suited for someone who is structured, proactive, and comfortable operating in a fast-moving environments.

Responsibilities & Duties:

• Operate as a trusted extension of the Chief Nuclear Officer.

• Step into meetings, discussions, and initiatives on behalf of the CNO as needed.

• Ensure follow-through on key decisions, priorities, and external engagements.

• Oversee intergovernmental relations, both state and international.

• Partner with the CNO to shape and execute regulatory affairs strategy.

• Translate priorities into clear plans across federal, state, and regulatory stakeholders.

• Support engagement with agencies such as DOE, NRC, and other key partners.

• Lead annual and quarterly planning for the regulatory affairs function.

• Build and manage OKRs to track progress against key priorities.

• Monitor key initiatives and flag risks, gaps, and dependencies early.

• Align internal teams across engineering, licensing, legal, and communications.

• Ensure consistent messaging and coordination across all external-facing efforts.

• Drive execution across complex, multi-stakeholder initiatives.

• Prepare briefings, materials, and talking points for senior leadership and external stakeholders.

• Establish and run operating rhythms (staff meetings, reporting, planning cadences).

• Bring structure, clarity, and accountability to a fast-moving environment.

What We’re Looking For:

• 7–12+ years of experience in government affairs, policy, strategy, consulting, or program management.

• Strong executive presence.

• Clear, concise communicator.

• Experience working with or within federal agencies, Congress, or highly regulated industries.

• Strong understanding of energy, nuclear, defense, or infrastructure policy preferred.

• Proven ability to operate in ambiguity and drive outcomes across multiple stakeholders.

• Strong project management and organizational skills.

• Bias for action with high attention to detail.

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.

• Must work 100% onsite in our DC satellite office.
  

• Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage + 50% for dependents.

• Dental: 100% top tier plan coverage, orthodontia extra, 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.

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.

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.

Compensation Range: $154.5K - $256.2K