2027 New Graduate - Reactor Operations Engineer

Radiant; El Segundo (CA); On-site; USD 120,000 - 180,000; Full time

Benefits offered by this job

Stock plan

Medical plan (base Silver + dependents

One Medical memberships

Vision plan

Dental plan

Flexible PTO

Remote workday allocation

Parental leave

Job summary

Radiant in El Segundo, CA is hiring a Reactor Operations Engineer to bridge software and hardware testing with regulatory procedures. You will translate complex designs into executable, DOE/NRC compliant workflows and help engineers improve operator interfaces and tools.

Ideal candidates will apply first principles thinking to optimize testing, procedures, and human factors while collaborating with a multidisciplinary team to enable safe, efficient reactor operations.

Qualifications

• BS or MS in Mechanical, Nuclear, Aerospace or related field.
• Graduating in Dec 2026 or Spring 2027.
• Experience in managing or optimizing hardware and software testing/operations.
• Ability to apply first principles thinking to solve problems.

Responsibilities

• Develop and refine operational procedures that integrate software and hardware-in-the-loop testing.
• Bridge engineering, operations, and human factors to create DOE/NRC compliant procedures.
• Collaborate with engineers to improve operator interfaces, workflows, and software tools.
• Gain firsthand experience to ensure procedures align with real-world execution.
• Support testing and improvements of digital twin scenarios and operator systems.
• Ensure DOE and NRC standards are met with clear, usable procedural documentation.

Skills

Hardware and software processes

First principles thinking

Procedures development

Systems thinking

Education

BS or MS in Mechanical Engineering, Nuclear Engineering, Aerospace Engineering, or related

Graduating December 2026 or Spring 2027

Tools

Python

UNIX

Job description

About Radiant

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.

Radiant is seeking a highly motivated Reactor Operations Engineer to join the team.

Responsibilities:

• Develop and refine operational procedures that integrate both software and hardware-in-the-loop testing.

• This role offers a rare opportunity to bridge engineering, operations, and human factors in a highly technical and regulated environment. You will collaborate with a multidisciplinary team to translate complex hardware and software designs into clear, executable, and DOE or NRC compliant procedures. Your work will ensure that Reactor Operators (ROs) and Senior Reactor Operators (SROs) can efficiently and safely execute test, commissioning, and operational activities.

• Collaborate closely with engineers to improve operator interfaces, procedural workflows, and software tools.

• Gain firsthand experience, ensuring procedures align with real-world execution.

• Support testing and iterative improvements of digital twin scenarios, operator systems, and human-machine interfaces.

• Ensure compliance with DOE and NRC standards, maintaining strict formatting, clarity, and usability in procedural documentation.

Qualifications:

• BS or MS in Mechanical Engineering, Nuclear Engineering, Aerospace Engineering, or a related discipline.

• Graduating in December 2026 or Spring 2027.

• Proficiency in managing or optimizing complex hardware and software processes for testing and operations.

• Ability to apply first principles thinking to solve problems and make decisions in uncertain or ambiguous situations.

Desired Qualifications:

• Hands-on experience in developing technical procedures, human factors engineering, or operational interface design.

• Proficiency in Python, UNIX, for procedure testing within the simulator environments.

• Experience with human factors and user-centered instructions for operational workflows.

Benefits and Perks

• 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.
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.