Computational Nuclear Engineer

Thea Energy • Kearny, NJ

2d • $120,000 - $180,000

About The Position

We are seeking a highly motivated Computational Nuclear Engineer to join our team, focusing on neutronics and multiphysics simulations for stellarator fusion systems. The ideal candidate will possess a strong background in computational transport methods, with a particular emphasis on multiphysics reactor design, dose rate calculations, and radiation shielding optimization. You will work with minimal supervision, contributing to cutting-edge research and development to ensure the safety and performance of Thea Energy’s stellarator systems.

Requirements

• PhD in Nuclear Engineering, Computational Physics, Applied Physics, or a related field with 2+ years of experience; or a Master’s degree in a relevant field with 4+ years of experience.
• Strong knowledge of Monte Carlo radiation transport codes (e.g., OpenMC, MCNP, Serpent).
• Proficiency in programming languages commonly used in scientific computing, specifically Python and C++.
• Proficiency in modern scientific software development best-practices (e.g. git, GitHub, CI)
• Experience in multiphysics coupling frameworks (e.g., MOOSE, Cardinal, NekRS).
• Excellent analytical, problem-solving, and communication skills.
• Ability to work independently and manage projects with minimal supervision in a startup environment.
• Strong attention to detail and a passion for advancing the field of fusion energy research.
• Willingness to collaborate with a diverse team of scientists and engineers within the company and externally.
• Persistent optimism and a willingness to take on tough challenges.
• Excited to think creatively about solutions to difficult problems and not relying solely on what has been done before.

Nice To Haves

• Experience with nuclear data processing and libraries (e.g., NJOY).
• Experience with deterministic neutron transport solvers (e.g. Atilla, OpenSN)
• Familiarity with High-Performance Computing (HPC) environments and parallel programming (MPI/OpenMP).
• Background in applying machine learning techniques to optimize nuclear simulation results or data handling.
• Understanding of fusion-specific nuclear challenges, such as first-wall material damage and tritium fuel cycle management.

Responsibilities

• Develop and implement advanced workflows for high-fidelity neutronics and related multiphysics simulations in complex 3D stellarator geometries.
• Conduct simulations of fusion blanket performance, including tritium breeding ratios (TBR), energy deposition, material activation, radiation shielding, and more.
• Collaborate with cross-disciplinary teams to perform multiphysics coupling (e.g., neutronics to thermal-hydraulics or structural analysis) to refine reactor designs.
• Perform dose rate calculations and design optimized shielding solutions for personnel and sensitive equipment.
• Prepare technical reports, presentations, and publications based on simulation results and optimization findings.

Benefits

• Comprehensive health benefits (e.g. medical/dental/vision)
• Employee equity stock options
• 20 days PTO

What This Job Offers

• Job Type: Full-time
• Career Level: Senior