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About Us At Antares, our long-term mission is to make clean energy abundant from Earth to the Asteroid Belt. We’re fueled by the belief that advanced nuclear energy can strengthen our military, solve the climate crisis, elevate global living standards, and expand humanity's presence in outer space. To achieve our mission, we’re building mass-producible, inherently safe, deployable microreactors that can be used terrestrially, underwater, and in space. Formed in 2023, the Antares team hails from SpaceX, The White House, MIT, Rigetti Computing, The Air Force, General Atomics, Relativity Space, Ursa Major, and National Laboratories like Los Alamos, Idaho, and Oak Ridge. Antares has raised over $130M in venture capital from top-tier investors and has over $13M in government funding. About the Team As a Welding Engineer II at Antares, you will support the development, qualification, and production of welded hardware for our reactor systems. You will own welding processes from early design and material selection through procedure development, qualification, manufacturing, inspection, and final acceptance. This role requires a strong understanding of welding metallurgy, fabrication processes, and weld quality—particularly for stainless steels, nickel-based superalloys, and other materials used in high-temperature and demanding environments. You will work closely with design, materials, manufacturing, quality, and external suppliers to ensure welded assemblies meet performance, reliability, and regulatory requirements. The ideal candidate combines sound welding fundamentals with a hands-on, practical approach to manufacturing. You should be comfortable working directly with welders and technicians, troubleshooting issues on the floor, and developing scalable processes for first-of-a-kind reactor hardware. Roles & Responsibilities: - Develop, qualify, and maintain welding procedures, including Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR), and welder performance qualifications. - Select appropriate welding processes, filler metals, joint designs, shielding methods, and process parameters based on material and component requirements. - Provide design-for-welding guidance, including recommendations related to joint accessibility, distortion, residual stress, inspection, and manufacturability. - Support welded hardware from prototype development through production, inspection, testing, and final acceptance. - Work directly with welders, technicians, and suppliers to establish repeatable, high-quality fabrication processes. - Create manufacturing work instructions, process controls, weld maps, inspection criteria, and technical specifications. - Develop and execute weld qualification plans, including destructive and nondestructive testing. - Review weld documentation, inspection results, material certifications, and supplier records for compliance with engineering requirements. - Lead root-cause investigations for weld defects, distortion, cracking, leakage, and other fabrication nonconformances. - Develop repair and rework procedures and provide technical disposition of welding-related nonconformances. - Interface with design, materials, analysis, manufacturing, quality, and test engineers to ensure welded assemblies satisfy structural, thermal, pressure, and lifetime requirements. - Support the selection, qualification, and technical oversight of welding suppliers and outside fabrication partners. - Promote a strong culture of safety, quality, documentation, and continuous process improvement. Basic Qualifications: - Bachelor’s degree in Welding Engineering, Materials Science and Engineering, Mechanical Engineering, or a related technical field. - 2+ years of professional experience in welding engineering, joining processes, or welded hardware manufacturing. - Working knowledge of common fusion welding processes, such as GTAW, GMAW, PAW, laser welding, or