Radiant
Overview
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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 approach uses modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant plans to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028. Radiant is seeking a Welding Technician who will fabricate and assemble our development microreactor unit, build large and small-scale test rigs, create prototype parts and tooling, source tools for builds, and handle materials. You will be a foundational technician with a high degree of autonomy, building and maintaining our prototype shop in our El Segundo headquarters and using a variety of shop activities (machining, welding, metal forming, electrical work, plumbing). You will contribute technically to the team and support fueling a new reactor design in over 50 years by 2026. Responsibilities and Duties
Perform MIG, TIG, and tube welding on metals including stainless steel, aluminum, and carbon steel. Read and interpret blueprints, technical drawings, and welding symbols. Operate welding equipment and tools with precision to meet tight tolerances. Conduct inspections to ensure welds meet internal and external quality standards. Assist with tasks such as basic machining (lathe, mill, drill press), electrical work (wiring, troubleshooting, assembling components), and support assembly and testing of mechanical or electro-mechanical systems. Collaborate with engineers and technicians to improve weld and build processes. Required Skills and Qualifications
5+ years of professional welding experience with MIG, TIG, and tube welding. Proficient with welding on stainless steel, aluminum, and mild steel. Ability to lift 50 lbs and stand for extended periods. Ability to work independently and efficiently with minimal supervision. Ability to stay organized and detail-oriented. Ability to use traditional inspection tools for part and assembly inspection. Ability to read mechanical drawings and interpret tolerances. Able to read and interpret fluid or electrical schematics. Experience in manufacturing with machine tools, saws, grinders, etc. Ability to work in outdoor environments as needed and at elevated heights occasionally (scissor lifts, ladders). Ability to travel on occasion for offsite support. Desired Skills and Qualifications
Experience operating high pressure and temperature systems. Experience with CNC programming and manual machine operation. Experience with GD&T interpretation (preferred). Knowledge/experience with electrical components and high voltage systems. Experience operating safely in shop environments. Experience lifting, rigging, and preparing for heavy crane operations of complicated parts. Proficient computer skills; comfortable with Microsoft Office. Additional Requirements
Must be willing to work extended hours and weekends as necessary to achieve company goals. Must work 100% onsite at El Segundo HQ. Total Compensation and Benefits
Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of interview performance, experience, education, and qualifications. Benefits and Perks for Eligible Employees
Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, with options up to Platinum plans. One Medical: Sponsored memberships for employees and their 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 and remote workday allocation. Company and team-bonding events, happy hours, and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. 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.
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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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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 approach uses modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant plans to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028. Radiant is seeking a Welding Technician who will fabricate and assemble our development microreactor unit, build large and small-scale test rigs, create prototype parts and tooling, source tools for builds, and handle materials. You will be a foundational technician with a high degree of autonomy, building and maintaining our prototype shop in our El Segundo headquarters and using a variety of shop activities (machining, welding, metal forming, electrical work, plumbing). You will contribute technically to the team and support fueling a new reactor design in over 50 years by 2026. Responsibilities and Duties
Perform MIG, TIG, and tube welding on metals including stainless steel, aluminum, and carbon steel. Read and interpret blueprints, technical drawings, and welding symbols. Operate welding equipment and tools with precision to meet tight tolerances. Conduct inspections to ensure welds meet internal and external quality standards. Assist with tasks such as basic machining (lathe, mill, drill press), electrical work (wiring, troubleshooting, assembling components), and support assembly and testing of mechanical or electro-mechanical systems. Collaborate with engineers and technicians to improve weld and build processes. Required Skills and Qualifications
5+ years of professional welding experience with MIG, TIG, and tube welding. Proficient with welding on stainless steel, aluminum, and mild steel. Ability to lift 50 lbs and stand for extended periods. Ability to work independently and efficiently with minimal supervision. Ability to stay organized and detail-oriented. Ability to use traditional inspection tools for part and assembly inspection. Ability to read mechanical drawings and interpret tolerances. Able to read and interpret fluid or electrical schematics. Experience in manufacturing with machine tools, saws, grinders, etc. Ability to work in outdoor environments as needed and at elevated heights occasionally (scissor lifts, ladders). Ability to travel on occasion for offsite support. Desired Skills and Qualifications
Experience operating high pressure and temperature systems. Experience with CNC programming and manual machine operation. Experience with GD&T interpretation (preferred). Knowledge/experience with electrical components and high voltage systems. Experience operating safely in shop environments. Experience lifting, rigging, and preparing for heavy crane operations of complicated parts. Proficient computer skills; comfortable with Microsoft Office. Additional Requirements
Must be willing to work extended hours and weekends as necessary to achieve company goals. Must work 100% onsite at El Segundo HQ. Total Compensation and Benefits
Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of interview performance, experience, education, and qualifications. Benefits and Perks for Eligible Employees
Stock: Substantial incentive stock plan for all full-time employees. Medical: 100% up to base silver level plan for employee + 50% dependents, with options up to Platinum plans. One Medical: Sponsored memberships for employees and their 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 and remote workday allocation. Company and team-bonding events, happy hours, and in-person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. 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.
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