Director, Cybersecurity

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
Radiant is seeking a Director, Cybersecurity to implement the controls and protection necessary for safeguarding our sensitive information and technology. You will be responsible for cybersecurity, partnering with our engineering and IT departments to implement security controls, as well as developing and managing information protection programs. You will drive innovation across the nuclear industry by advocating for controls and access solutions that have not been previously deployed. A successful candidate will leveragetheir experience on DoD and IC programs and bring those same designs to the nuclear space. Creativity and a passion for challenging the status quo are a must.
Responsibilities & Duties:

• Lead the development and implementation of comprehensive security strategies and policies.

• Manage budget and resources for security infrastructure.

• Lead cybersecurity audits, assessments, and control testing.

• Review regulatory requirements and provide solutions and rationale that meet the intent of those requirements with modern tools.

• Review operational requirements and system specification documents to ensure applicable security requirements are addressed and incorporated into security processes.

• Educate stakeholders on modern and efficient means for protecting material and information.

• Serve as our liaison with regulators, auditors, and government stakeholders.

Required Qualifications & Skills:

• 7+ years of experience in cybersecurity, preferably in a defense or high-assurance environment.

• Strong understanding of application security and performing assessments utilizing a risk management framework.

• Proven track record of developing and implementing security policies and procedures.

• Knowledge of relevant federal and state regulations affecting nuclear and defense industry security.

• Bachelor's degree in Computer Science, Engineering, or a related field.

Desired Qualifications & Skills:

• Direct experience with nuclear security regulations (NRC 10 CFR 73).

• Experience interfacing with executive leadership and external regulators.

• Familiarity with ICS/OT cybersecurity in energy or defense environments.

• Prior work with COMSEC, insider threat programs, or physical-cyber integration.

• Professional certifications (e.g., CPP, PSP, PCI from ASIS International).

• Previous experience working with defense contracts and understanding of relevant export control regulations (Part 810, Pat 110, EAR, ITAR).

Additional Requirements:

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

• Must work 100% onsite at El Segundo HQ.
  

• 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.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

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.