Senior Test Engineer

About the Company

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed to provide critical power to hospitals, data centers, and remote sites.

Responsibilities

• Qualify as an operator to gain firsthand experience, ensuring procedures align with real-world execution
• Collaborate closely with engineers to improve operator interfaces, procedural workflows, and software tools
• Support testing and iterative improvements of digital twin scenarios, operator systems, and human-machine interfaces
• Ensure compliance with DOE and NRC standards, maintaining strict formatting, clarity, and usability in procedural documentation
• Develop and refine operational procedures that integrate both software and hardware-in-the-loop testing

Requirements

• 6-7+ years of professional experience in engineering problem-solving, system design, analysis, or testing
• Proficiency in managing or optimizing complex hardware and software processes
• Background in highly regulated industries such as nuclear, aerospace, aviation, or maritime
• Ability to apply first principles thinking to solve problems in uncertain situations
• Must work 100% onsite at El Segundo HQ
• Willingness to travel 50% - 60% of the time

Preferred Qualifications

• Prior experience as an operator in nuclear environments (e.g., naval reactors, radiation-controlled facilities)
• 2+ years of full-time nuclear operations experience
• Licensed as Senior Reactor Operator or Naval equivalent
• Proficiency in Python and UNIX for procedure testing within simulator environments
• Experience with human factors engineering or user-centered instruction design