Job Description

Overview

Radiant is an El Segundo, CA-based startup developing portable nuclear microreactors. They are seeking a Senior Test Engineer to lead test operations for their innovative nuclear technology, collaborating with a multidisciplinary team in a fast-paced environment.

Responsibilities

  • Perform testing as a Test Conductor/Test Director to ensure 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.
  • 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 to drive hardware risk reduction.
  • Ensure compliance with DOE and NRC standards in procedural documentation.

Requirements

  • 5+ years of full-time professional experience in engineering problem-solving, including system design, analysis, or testing.
  • Bachelor’s degree in mechanical, manufacturing, or related engineering discipline.
  • Ability to apply first principles thinking to solve problems in uncertain situations.
  • Background in highly regulated industries such as nuclear, aerospace, aviation, or 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 with the ability to seek out requirements with minimal direction.

Benefits

  • Stock
  • Health Insurance
  • Vision
  • Dental
  • PTO

Additional Information

  • Must be willing to work extended hours and weekends as necessary.
  • Must work 100% onsite at El Segundo HQ.

Benefits

Stock
Health Insurance
Vision
Dental
PTO

How this job compares in El Segundo, CA

Pay in context

This employer didn't publish a rate. For reference, welding jobs in El Segundo, CA currently run a median of $38/hr in our index, with the middle half of them falling between $38–$58/hr across 19 postings with published pay. That median is a reasonable floor to anchor on when a recruiter asks what you're looking for.

The local market in El Segundo, CA

We're tracking 23 other active welding openings in El Segundo, CA right now, from 10 different employers. 19 of them were added in the last week. Across California as a whole we're tracking 623 other active welding openings from 288 employers. A metro this active generally means you have real leverage — employers here are competing for the same welders. Browse every welding job in El Segundo, or widen the search to California.

Radiant currently has 3 other openings live in California, which is usually a sign of either steady growth or steady turnover — worth asking which in the interview.

The most active employers in California at the moment, by number of open welding reqs, are SpaceX (34), Vast (22), and Relativity Space (20). Volume like that usually means either a genuine expansion or a staffing agency working several client sites — worth knowing which before you apply.

Within California, the best-paying metros we track by median hourly rate are Redondo Beach at $71/hr, Long Beach at $54/hr, and Torrance at $43/hr. If you can relocate or commute, that spread is worth factoring in.

Similar openings near El Segundo, CA

Pay figures are medians computed from live postings in the Welding Pros index, not from survey data, and they move as employers post. Senior Test Engineer, Mechanical/Fluids figures were last recalculated when this page was built.