Lead Nuclear Engineer

Radiant is seeking a technical and people-oriented leader for our nuclear design and analysis group focused in areas such as core physics, shielding, instrumentation & controls, and reactor operations. You will lead a high-performing team through the design, development, and test stages of the Kaleidos microreactor. You will own the schedule, budget, hiring, and execution of nuclear-related milestones with a key focus on safety, reliability, portability, and performance.

The ideal candidate is comfortable in interdisciplinary environments working cross-functionally with engineers and leadership, is fluent in engineering first principles, has tenacious creative problem‑solving abilities and keen to get to the solution of a problem, and loves to mentor and motivate engineers to deliver their best work. You will play a critical role in driving the first portable nuclear microreactor to market.

• Manage an interdisciplinary team of nuclear engineers focused in areas such as safety analyses, core performance, shielding – including operational dose, activation, shutdown dose – I&C, operations, thermal‑hydraulics and more.
• Hire, lead, and grow a high performing team of nuclear engineers.
• Own nuclear engineering projects end to end including requirement capture, multi‑disciplinary design iteration, simulation pipeline development, analysis post‑processing, and summarization for regulatory deliverables.
• Collaborate with regulatory team on nuclear industry standards and requirements.
• Mentor engineers through actionable feedback and coaching.

• Bachelor’s degree in nuclear engineering or equivalent degree from an accredited institution.
• 5+ years nuclear engineering industry experience with relevant software use, including MCNP and/or OpenMC.
• Deep knowledge of neutron transport and Monte Carlo simulation theory.
• 1+ year managing direct reports.

• Master’s or PhD in nuclear engineering or equivalent degree from an accredited institution.
• Subject matter expert in one of the following areas: safety analysis, shielding, instrumentation and controls, reactor operations, and/or radioactive material transportation.
• Hands‑on experience designing hardware and/or performing tests.
• Experience with High‑Performance Computing.
• High‑level understanding of government regulatory requirements and engineering practices required to build a safe, reliable reactor.
• Self‑starter and autonomous in planning, scheduling, and leading teams to execute on milestones on time.
• Experienced leading teams in fast‑paced environments, complex technical environment.
• Expert communicator up and down the chain and effectively acts as a technical advisor.
• Ability to make sound judgement calls based on company priorities and resources.
• Tenacious in finding creative solutions to complex problems.

• 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.

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…