Senior Test Engineer, Nuclear Fluids & Systems

Radiant; El Segundo, Northern (CA, KY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Stock options

Medical plan

One Medical membership

Vision plan

Dental plan

Life and other benefits

Parental leave

Job summary

Radiant, based in El Segundo, CA, seeks a Senior Test Engineer to drive mission-critical test operations for its nuclear microreactor development. You will translate complex hardware and software designs into executable tests, procedures, and ground support for a fast-paced production environment.

You will collaborate across disciplines to plan tests, review data, and mitigate risks, gaining hands-on experience as test conductor and test director while contributing to procedural tooling and

Qualifications

• 5+ years of full-time professional experience in engineering problem-solving, including system design, analysis, or testing.
• Bachelor’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline.
• Ability to apply first principles thinking to solve problems and make decisions in uncertain or ambiguous situations.
• Background in highly regulated industries (e.g., nuclear, aerospace, aviation, maritime).
• Demonstrated ability to lead projects and work independently.
• Strong technical fundamentals in fluids and thermodynamics.
• Strong written and verbal communication skills.
• Flexible and adaptable mindset - self-driven with the ability to seek out requirements with minimal direction.

Responsibilities

• Perform testing as a Test Conductor/Test Director to gain firsthand experience, ensuring procedures align with real-world execution.
• Partner with design engineers to develop innovative test methods for complex mechanisms and structures.
• Support testing and iterative improvements of fluid, electrical, and structural hardware of the Kaleidos reactor through development, qualification, and acceptance testing.
• Identify and develop appropriate suppliers for component sourcing and fabrication.
• Drive initiatives for continuous improvement in test processes and data delivery quality.
• Support one-off test campaigns in a fast paced, minimum-requirements environment to drive hardware risk reduction.
• Ensure compliance with DOE and NRC standards, maintaining strict formatting, clarity, and usability in procedural documentation.

Skills

Engineering problem-solving

System design

Analysis

Testing

Communication

Project leadership

First principles thinking

Regulated industries knowledge

Fluids and thermodynamics

Independent work

Education

Bachelor’s degree in mechanical/manufacturing or related engineering

Tools

Ion

Epsilon3

NX CAD

Teamcenter

Beckhoff PLC Controllers

Job description

Radiant, based in El Segundo, CA, seeks a Senior Test Engineer to drive mission-critical test operations for its nuclear microreactor development. You will translate complex hardware and software designs into executable tests, procedures, and ground support for a fast-paced production environment.

You will collaborate across disciplines to plan tests, review data, and mitigate risks, gaining hands-on experience as test conductor and test director while contributing to procedural tooling and