We are seeking a Build Engineer, Turbomachinery to help bring high-speed rotating hardware from design into reality. This is a hands-on role ideal for new graduates or early-career engineers who want to learn by building, assembling, and integrating complex turbomachinery systems. You will work closely with design, test, and manufacturing teams, helping prepare hardware for first-article testing and system validation.
This is a fantastic opportunity to gain real-world experience with high-speed, high-temperature rotating machinery while making a direct impact on a first-of-its-kind nuclear microreactor program.
Responsibilities
Hands-On Builds & Assembly
Responsible for assembly and integration of prototype and first-article turbomachinery hardware, including compressors, turbines, rotors, electric motors, bearings, seals, and housings
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
Process & Tooling Support
Help develop and maintain build tools, fixtures, and workholding 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
Cross-Functional Collaboration
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
Learning & Growth
Gain experience with high-speed rotating machinery, tight tolerances, and precision assembly
Learn industry best practices for turbomachinery build, integration, and first-article readiness
Develop problem-solving skills and hands-on engineering judgment in a fast-paced startup environment
Required Qualifications
Bachelor’s degree in Mechanical Engineering or a related field (or expected graduation within 6 months)
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
Desired Qualifications
Prior hands-on experience from internships, co-ops, class projects, or design competitions (SAE, Formula SAE, robotics, etc.)
Familiarity with mechanical assembly, rotor balancing, or bearing handling
Interest in turbomachinery, power generation, or high-speed rotating systems
Excited to work in a fast-paced, innovative startup environment
Prior nuclear experience is not required
Additional Requirements
Must be willing to work extended hours and occasional weekends to support build schedules
Must work 100% onsite at Radiant’s El Segundo headquarters
Stock: Substantial incentive stock plan for all full-time employees.
Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
One Medical: Sponsored memberships for employees and their dependents.
Vision: 100% top tier plan coverage + 50% for dependents.
Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com.
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
Unfortunately, we are unable to provide visa sponsorship at this time.
This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.