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ABOUT RADIANT 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 that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. ABOUT THE ROLE Radiant is seeking a highly motivated Senior Manufacturing Engineer who will be working closely with design engineers to innovate on the production of complex mechanisms and structures critical to our microreactor technology. You will ensure reliable, safe, quality, and delivery of the Kaleidos demonstration unit that will test in 2026 at the Idaho National Lab and be instrumental to testing the first new reactor design in over 50 years. Responsibilities & Duties: - Responsible for the manufacturing and inspection process for critical components and assemblies within the Kaleidos microreactor. - Partner with design engineers to develop innovative production methods for complex mechanisms and structures. - Develop, qualify, and refine manufacturing processes to meet all design and business requirements including safety, quality, efficiency, and delivery. - Develop and execute manufacturing specifications and fabrication instructions. - Manage manufacturing bill-of-materials (mBOM) for components and assemblies. - Identify and develop appropriate suppliers for component sourcing and fabrication. - Identify, plan, and execute capital equipment, machine, and layout upgrades to meet evolving production requirements. - Drive initiatives for continuous improvement in manufacturing processes and product quality. Required Qualifications & Skills: - Bachelor’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline. - 4+ years of experience with manufacturing of mechanical products in a production environment, preferably in high-tech or energy sectors. Desired Qualifications & Skills: - Master’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline. - Experience with machining and ancillary operations such as milling, turning, grinding, EDM of materials. - Experience with interpreting engineering drawings and models, Geometric Dimensioning & Tolerancing (GD&T). - Experience with inspection systems including manual gauges and coordinate-measuring machine (CMM). - Experience with non-destructive testing/non-destructive evaluation (e.g. fluorescent penetrant inspection, radiography, eddy current). - Experience with custom machine design; electromechanical systems, motors, actuators, linear rails, bearings, lifting/rigging, etc. - Experience with design of multi-component assemblies in CAD (NX or similar). - Strong problem-solving skills and attention to detail. - Self-motivated with strong organizational, written, and oral communication skills. - Demonstrated ability to work collaboratively with design and operations teams.  Additional Requirements: - Must be willing to work extended hours and weekends as necessary to accomplish our mission. - Must work 100% onsite at El Segundo HQ. BENEFITS AND PERKS - 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 me