Welding Specialist

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 unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory‑built microreactors that leverage existing, well‑qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

Radiant is seeking a highly skilled Welding Specialist to join our engineering team. In this role, you will work directly with the Lead Welding Engineer in a collaborative, closed‑loop environment to develop and bring our innovative nuclear reactor to life. This position demands hands‑on expertise in welding processes, quality assurance, and production support within a dynamic startup setting.

• Develop, implement, and maintain Welding Procedure Specifications (WPS), Procedure Qualification Records (PQRs), and Welder Performance Qualifications (WPQs) for structural and pressure vessel welds.
• Collaborate with the production team to write planning and pathfinding processes for welding operations.
• Design and fabricate weld tooling to support manufacturing needs.
• Perform hands‑on welding as needed to train technicians on proper welding techniques.
• Track and ensure all welding and inspections comply with governing code requirements.
• Conduct audits of welding performed at suppliers.
• Identify and source new assets to enhance in‑house welding capabilities.
• Order consumables, tooling, and other materials required for welding operations.

• Associate degree or higher in Welding Technology, Materials Science, or a related field is preferred.
  • Candidates with a high school diploma or equivalent and significant relevant work experience are strongly encouraged to apply.
• Proven experience performing and/or planning for GTAW, GMAW, OTW, Laser welding (robotic or handheld), and/or other processes in a production environment.
• Ability to perform welding tasks independently.
• Strong skills in teaching and mentoring technicians on welding best practices.
• Expertise in tracking welding processes and ensuring compliance with industry codes and standards.
• Excellent problem‑solving abilities and a collaborative mindset for working in a fast‑paced team.

• AWS certifications such as CWI (Certified Welding Inspector), CW (Certified Welder), or CWS (Certified Welding Supervisor).
• Experience with non‑destructive testing methods including RT (Radiographic Testing), PT (Penetrant Testing), MT (Magnetic Particle Testing), and VT (Visual Testing).
• 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.

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.

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 your interview performance, experience, education, and qualifications.

• Stock:
  Substantial incentive stock plan for all full‑time employees.
• Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
• One Medical:
  Sponsored memberships for eligible employees and their dependents.
• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee‑contributed benefits.
• 8‑weeks…