Lead Reactor Operations Engineer
Radiant
Lead Reactor Operations Engineer
Radiant
Portable nuclear microreactors replacing diesel generators
Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.
As the Lead Reactor Operations Engineer, you will direct the team providing operational insights to ensure the development of Kaleidos and its functionality meet the requirements for safe, efficient, and reliable reactor operations and commissioning. This position will oversee and approve the development of reactor operating interfaces, conduct of operations, and procedures. You will also go one step further and qualify as a Kaleidos Reactor Operator yourself – always remaining technically hands on.
Responsibilities & Duties:
Lead, mentor, and grow a team of Reactor Operations Engineers, setting technical priorities aligned with test, commissioning, and operational milestones.
Qualify as an operator to gain firsthand experience and ensure the team's work aligns with real-world execution.
Establish the conduct of operations and fleet monitoring processes for Kaleidos reactors.
Support development of control algorithms for semi-autonomous and/or manual operations.
Support the evaluation of integrated plant response to various events, accidents, and malfunctions.
Participate in design reviews and provide feedback from an operations and maintenance perspective.
Ensure all team deliverables meet DOE and NRC standards, maintaining strict formatting, clarity, and usability in procedural documentation.
Recruit, hire, and develop engineering talent to scale the team with Radiant's growth.
Required Qualifications & Skills:
6+ years of full-time professional engineering experience, including system design, analysis, or testing, with 2+ years in a formal or informal technical leadership role.
Familiarity with the interrelationships and dependencies of reactor systems, encompassing nuclear, mechanical, I&C and electrical systems - and their response as an integrated power plant system.
Licensed as Senior Reactor Operator or Naval equivalent.
Ability to apply first principles thinking to solve problems and make decisions in uncertain or ambiguous situations.
Excellent written and verbal communication skills.
Background in highly regulated industries (e.g., nuclear, aerospace, aviation, maritime).
Demonstrated ability to lead and develop technical teams, managing and making decisions on risk, while remaining hands-on.
Desired Qualifications & Skills:
Prior experience working as an operator in nuclear environments (e.g., nuclear energy, naval reactors, or radiation-controlled facilities), with familiarity in safety protocols, regulatory compliance, and high-reliability operations.
3+ years of full-time nuclear operations experience.
Licensed as Senior Reactor Operator or Naval equivalent.
Hands-on experience in developing technical procedures, human factors engineering, or operational interface design.
Prior operations background such as mission control room operator.
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.
Willingness to travel 50% - 60% of the time, as needed for projects.
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.
Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.
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 full-time 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.
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.
Radiant designs and manufactures portable, factory-built nuclear microreactors for off-grid power. Its Kaleidos unit is a 1 MWe high-temperature gas-cooled reactor that uses TRISO fuel and a helium coolant, packaged in a container-sized module that can be transported by truck, ship, or air for rapid deployment to remote sites. The reactor runs for up to five years between refueling as part of a 20-year lifecycle and operates without water cooling, enabling flexible siting. Radiant differentiates itself through factory production of certified HTGR-based microreactors with an ambitious R-50 factory to enable mass production and fast deployment for energy resilience, military, data centers, and critical infrastructure. The company aims to provide reliable, emissions-free power that replaces diesel and supports resilient energy infrastructure at remote or critical locations.
Explore more opportunities at Radiant