Holtec International in Madrid, Spain, is seeking a Senior Pipe Stress Engineer to lead nuclear piping design and stress analysis for ASME Section III systems, coordinating with design, materials, welding, procurement, and construction. The role requires 15+ years in nuclear piping, experience with AutoPIPE, Smart3D, PV Elite, and GT STRUDL, plus familiarity with NRC/CSA rules. You will mentor teams, develop LBB/HELB methodologies, and support vendor reviews and project budgeting.