Head of Nuclear Security

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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

Head of Nuclear Security

Radiant is seeking a Security Expert to implement the controls and protection necessary for safeguarding our sensitive information and technology. You will be responsible for program security, ranging from factory site security planning to information protection programs; experience in both physical and cyber security is a plus. You will have strategic control and autonomy in the shaping of our security department and philosophy as we grow our operations. A successful candidate will be one who thinks creatively and implements lightweight and logical solutions to regulatory requirements. We a looking for a proactive leader who can mature our security program as we expand our operations.

Responsibilities And Duties

- Lead the development and implementation of comprehensive physical security strategies and policies.

- Oversee the management of access control systems and surveillance technology.

- Develop emergency response and crisis management plans, interfacing with local law enforcement and first responders.

- Manage budget and resources for security infrastructure and personnel.

- Lead cybersecurity audits, assessments, and control testing.

- 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 physical security, preferably in a defense or high-security environment.

- Strong understanding of physical security principles, access control systems, and surveillance technology.

- 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 Criminal Justice, Security Management, or a related field.

Desired Qualifications & Skills

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

- Experience in managing a team of security professionals and interfacing with executive leadership.

- 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 ITAR and EAR regulations.

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.

Total Compensation And Benefits

Radiant's new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.

Benefits And Perks For Eligible Employees

- Stock: Substantial incentive stock plan for all full-time employees. - Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.

- One Medical: Sponsored memberships for eligible employees and their dependents.

- Vision: 100% premium coverage for top tier plan + 50% for dependents. - Dental: 100% premium coverage for top tier plan (including orthodontia) + 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.

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.