Senior Multiphysics Modeling Engineer

Responsibilities

• Develop and maintain multiphysics models (primarily in MOOSE) for high-temperature ceramic and metallic components and pulsed-load systems
• Simulate coupled thermal, structural, and electromagnetic behavior under rapid cyclic loading and high heat flux
• Implement and calibrate constitutive models for fatigue-dominated damage, fracture, and degradation mechanisms
• Execute rigorous verification and validation (V&V) by comparing model predictions to experimental results
• Apply uncertainty quantification and sensitivity analysis to support life predictions and design margins
• Translate modeling results into actionable design guidance for materials, joints, and components
• Run large-scale simulations in HPC environments and build reproducible, version-controlled workflows
• Help define a modeling roadmap and standards for key components and failure modes

Requirements

• PhD or MS with significant experience in Mechanical Engineering, Nuclear Engineering, Materials Science, or Applied Physics
• 5+ years of experience in multiphysics finite element or finite volume modeling of coupled thermal–mechanical systems
• Experience with irradiated materials modeling or materials in severely degrading environments
• Proficiency with advanced multiphysics platforms such as MOOSE, Abaqus, COMSOL, ANSYS, BISON, OpenMC, or MCNP
• Demonstrated experience with verification and validation against experimental data
• Experience running simulations in HPC environments
• Programming or scripting skills in Python or C++
• Ability to communicate model assumptions and uncertainties to cross-functional teams

Benefits

• Medical, Dental, and Vision plans
• 31 Days of PTO (21 vacation days and 10 sick days)
• 10 Paid holidays plus company-wide winter break
• Up to 5% employer 401(k) match
• Short term disability, long term disability, and life insurance
• Paid parental leave (up to 16 weeks)
• Annual wellness stipend

About the Company

Helion is a fusion power company based in Everett, WA, with the mission to build the world's first fusion power plant, enabling a future with unlimited clean electricity.