Lead Reactor Operations Engineer

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.

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.