Senior Test Engineer – Nuclear Systems & Test Conductor

Radiant; El Segundo (CA); On-site; USD 134,000 - 185,000; Full time

Benefits offered by this job

Stock options

Comprehensive medical plan

One Medical membership

Vision plan

Dental plan

FSA/HSA benefits

Parental leave (8 weeks)

Job summary

Radiant in El Segundo, CA is seeking a Senior Test Engineer to drive test operations for development, qualification, and acceptance of nuclear microreactor technology. The role focuses on fluid and mechanical systems, with hands-on responsibilities in test planning, execution, data review, and risk mitigation.

You will collaborate with a multidisciplinary team to translate complex hardware and software designs into executable test procedures, contribute to test ground support equipment, and work

Qualifications

• 5+ years of professional experience in engineering problem‑solving, including system design, analysis, or testing.
• Bachelor’s degree in mechanical, manufacturing, or related engineering field.
• Apply first principles thinking in uncertain situations.
• Background in highly regulated industries (nuclear, aerospace, aviation, maritime).
• Proven ability to lead projects and work independently.
• Strong fundamentals in fluids and thermodynamics.
• Excellent written and verbal communication skills.
• Willingness to work 100% onsite in El Segundo, CA.

Responsibilities

• Own and lead test strategy across development, qualification, and production acceptance.
• Plan and execute fluid, mechanical, and thermal tests on Kaleidos hardware from component to full system.
• Develop test methods and fixtures with design engineers.
• Integrate hardware into test setups with instrumentation and data acquisition.
• Author and maintain DOE/NRC‑aligned test procedures with clear formatting.
• Identify risks and mitigations for pressurized and high‑energy tests.
• Analyze test data and support root cause investigations.
• Drive continuous improvement in test processes and data quality.

Skills

5+ years experience

First principles

Nuclear/aerospace familiarity

Project leadership

Fluids & thermodynamics

Strong communication

On-site work

Education

Bachelors in Mechanical Engineering

Tools

Beckhoff

Python

MATLAB

Job description

Radiant in El Segundo, CA is seeking a Senior Test Engineer to drive test operations for development, qualification, and acceptance of nuclear microreactor technology. The role focuses on fluid and mechanical systems, with hands-on responsibilities in test planning, execution, data review, and risk mitigation.

You will collaborate with a multidisciplinary team to translate complex hardware and software designs into executable test procedures, contribute to test ground support equipment, and work