Test Engineer - Mechanical/Fluids (Nuclear)

Radiant System; El Segundo (CA); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Stock: substantial equity grants

Full medical plans for employee + 50%+

Daily catered lunch

Flexible PTO

On-site HQ near the Pacific Ocean

Job summary

Radiant is seeking a Test Engineer to drive mission-critical test operations for the Kaleidos nuclear microreactor project at our El Segundo, CA headquarters. You will bridge engineering, operations, and human factors to translate complex designs into clear, executable test procedures.

The role involves on-site collaboration with a multidisciplinary team to plan, perform, and review test campaigns, ensuring safety, quality, and regulatory alignment in a fast-paced environment.

Qualifications

• Bachelor's degree in engineering (mechanical, manufacturing, or related) is required.
• 2+ years of full-time professional engineering experience in design, analysis, or testing.
• Ability to apply first principles thinking in uncertain situations.
• Background in highly regulated industries (nuclear, aerospace, aviation, maritime).
• Demonstrated ability to lead projects and work independently.
• Strong fundamentals in fluids and thermodynamics.
• Excellent written and verbal communication skills.

Responsibilities

• Perform testing as a Test Conductor/Test Director to guide real-world test execution.
• Partner with design engineers to develop innovative test methods for complex mechanisms.
• Support testing and improvements of fluid, electrical, and structural hardware through development, qualification, and acceptance testing.

Skills

Engineering problem-solving

Mechanical engineering

Thermodynamics

Fluids

Independent worker

Strong communication

Education

Bachelor's degree in engineering

Tools

NX CAD

Beckhoff PLC

Ion

Teamcenter

Epsilon3

Job description

Radiant is seeking a Test Engineer to drive mission-critical test operations for the Kaleidos nuclear microreactor project at our El Segundo, CA headquarters. You will bridge engineering, operations, and human factors to translate complex designs into clear, executable test procedures.

The role involves on-site collaboration with a multidisciplinary team to plan, perform, and review test campaigns, ensuring safety, quality, and regulatory alignment in a fast-paced environment.