Radiant

Overview

Radiant is an El Segundo, CA-based startup focused on building the world’s first mass-produced, portable nuclear microreactors. They are seeking a Build Engineer to assist in the assembly and integration of complex turbomachinery systems for their innovative nuclear microreactor program.

Responsibilities

• Responsible for assembly and integration of prototype and first-article turbomachinery hardware.
• Develop precise assembly instructions, alignment procedures, and torque specifications.
• Support rotor stacking, bearing installation, balancing, and alignment operations.
• Document assembly activities, as-built observations, and lessons learned.
• Help develop and maintain build tools, fixtures, and work-holding solutions.
• Support creation of work instructions and standard operating procedures for assembly processes.
• Provide feedback to design and manufacturing teams to improve hardware assembly and integration.
• Work closely with design engineers, test engineers, and technicians to prepare hardware for testing and validation.
• Participate in troubleshooting assembly issues and contribute to iterative improvements.
• Receive mentorship from senior build engineers while gradually taking on more responsibility.

Requirements

• Bachelor’s degree in Mechanical Engineering or a related field.
• Strong interest in hands-on mechanical assembly, rotating machinery, or turbomachinery systems.
• Basic understanding of GD&T, fits, torque, and alignment principles.
• Comfort reading and interpreting mechanical drawings and CAD models.
• Willingness to learn, take initiative, and work safely with precision hardware.
• Prior hands-on experience from internships, co-ops, class projects, or design competitions is desired.
• Familiarity with mechanical assembly, rotor balancing, or bearing handling is a plus.
• Interest in turbomachinery, power generation, or high-speed rotating systems is preferred.

Benefits

• Health Insurance
• Dental
• Vision
• PTO

Additional Information

• Must be willing to work extended hours and occasional weekends to support build schedules.
• Must work 100% onsite at Radiant’s El Segundo headquarters.