Lead Test Engineer, Nuclear Systems — Onsite (El Segundo)

Speedrun Talent Network; El Segundo (CA); On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Stock options

Medical coverage

One Medical memberships

Vision coverage

Dental coverage

Parental leave

Education program sponsorship

Daily catered lunch

Flexible PTO

Remote workday option

Team events

El Segundo HQ near ocean

Job summary

Radiant is seeking a Lead, Test Engineering in El Segundo, CA to own testing strategy, execution, and team leadership for Kaleidos hardware and systems. This hands-on role will manage a team of test engineers and serve as the technical owner for multi-discipline testing, spanning thermal, materials, structural, and leak/flow testing.

You will build test infrastructure from the ground up, enabling rapid design iteration and robust validation prior to production.

Qualifications

• Bachelors or Masters in Mechanical Engineering or related field.
• 8+ years of experience in testing, development, or validation of complex mechanical, thermal, or electromechanical systems.
• Hands-on experience building and operating test setups for high-energy or high-temperature hardware.
• Experience designing test instrumentation and data acquisition systems, and analyzing test data.
• Experience with leak testing methods (helium leak detection, pressure decay) and flow/thermal test setups.
• Experience correlating test results with analytical predictions and design intent.
• Demonstrated technical leadership and ability to drive complex test efforts to completion.

Responsibilities

• Lead requirements definition, design, and implementation of Radiant’s test hardware, including test rigs and instrumentation.
• Build, commission, calibrate, and maintain test capabilities across thermal, materials, mechanical, structural, and leak/flow disciplines.
• Establish operating procedures, safety controls, and facility readiness for high-energy environments.
• Define equipment specifications, manage vendor selection and procurement, and plan test space layout.
• Work with quality to manage calibration programs, measurement traceability, and uncertainty analysis for all test equipment.
• Own and lead the test strategy across development, qualification, and production acceptance phases.
• Plan and execute development, qualification, and acceptance tests, including functional, performance, environmental, and endurance testing.
• Collaborate with design teams to resolve discrepancies and perform root cause investigations.

Skills

Mechanical engineering knowledge

Leadership

Test hardware development

Instrumentation & data acquisition

Leak testing methods

Analytical data correlation

Documentation & safety

Education

Bachelor’s or Master’s in Mechanical Engineering

Tools

LabVIEW

Python

MATLAB

Beckhoff hardware

PLCs

Job description

Radiant is seeking a Lead, Test Engineering in El Segundo, CA to own testing strategy, execution, and team leadership for Kaleidos hardware and systems. This hands-on role will manage a team of test engineers and serve as the technical owner for multi-discipline testing, spanning thermal, materials, structural, and leak/flow testing.

You will build test infrastructure from the ground up, enabling rapid design iteration and robust validation prior to production.