Build Engineer, Turbomachinery

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

• Assemble and integrate prototype and first-article turbomachinery hardware including compressors, turbines, rotors, and bearings
• Develop precise assembly instructions, alignment procedures, and torque specifications
• Support rotor stacking, bearing installation, balancing, and alignment operations
• Develop and maintain build tools, fixtures, and work-holding solutions
• Provide feedback to design and manufacturing teams to improve hardware integration
• Document assembly activities, as-built observations, and lessons learned

Requirements

• Bachelor’s degree in Mechanical Engineering or a related field
• Strong interest in hands-on mechanical assembly or turbomachinery systems
• Basic understanding of GD&T, fits, torque, and alignment principles
• Ability to read and interpret mechanical drawings and CAD models
• Willingness to work extended hours and occasional weekends to support build schedules
• Ability to work 100% onsite in El Segundo, CA

Preferred Qualifications

• Prior hands-on experience from internships, co-ops, or design competitions (SAE, Formula SAE, robotics)
• Familiarity with mechanical assembly, rotor balancing, or bearing handling
• Interest in power generation or high-speed rotating systems

Benefits

• Substantial incentive stock plan
• Comprehensive medical, vision, and dental coverage
• 8-weeks of paid parental leave
• Daily catered lunch and free snacks/drinks
• Flexible PTO policy