Neutronics Engineer

Gauss Fusion is a European greentech venture focused on engineering and industrialising magnetic confinement fusion power plants. The company is working to lead the commercialisation of fusion energy, with the goal of delivering its first gigawatt-class fusion power plant, the Gauss GIGA-Kraftwerk, by 2045. It connects leading fusion scientists with experienced European industrial fusion technology experts and operates at venture speed through a combination of private and public partnerships. The company's mission is rooted in producing clean, renewable fusion energy to secure long-term energy independence and address climate change. Gauss Fusion pursues high-field magnetic confinement fusion as what it considers the fastest viable path to commercial fusion energy production, and plans to integrate fusion power into the grid as a reliable base load provider that complements intermittent renewable energy sources. What distinguishes Gauss Fusion is its industrially grounded approach: it was founded by companies with hands-on fusion technology experience, applies best practices from industry, and leverages the existing infrastructure of former nuclear fission power plant sites to accelerate construction timelines and reduce costs. The company also collaborates with world-leading scientific and technology institutions and works proactively with regulatory authorities to streamline the licensing process for fusion power plants.

About the role

Gauss Fusion GmbH is advancing a commercially scalable stellarator fusion power. Our team brings together leading expertise in fusion physics, advanced engineering, computations, and industrial manufacturing. We are now seeking a Nuclear & Neutronics Engineer to help shape the design, safety, and performance of our core fusion systems.
This is an opportunity to work at the frontier of fusion energy, developing critical components for a future stellarator based fusion power plant, while contributing to Europe’s most ambitious energy initiative right now!

Main responsibilities

As a Nuclear & Neutronics Engineer at Gauss Fusion GmbH, you will:

• Develop technologies for breeding blankets, first-wall structures, shielding, divertor systems, and other auxiliary components, with a strong focus on commercialization, industrialization, and engineering readiness.
• Perform detailed neutronics analyses for stellarator fusion systems, including complex CAD geometries and volumetric plasma neutron sources.
• Design, run, and optimize Monte Carlo simulations, and clearly present results to technical and non-technical stakeholders.
• Scale and refine neutronics simulations for high-performance computing (HPC) environments.
• Collaborate closely with thermal, mechanical, and materials engineers to support coupled multiphysics analyses 
• Python scripting/automation to support and document simulation workflows with the use of e.g. Jupyter Notebooks
• Work within a highly collaborative, multidisciplinary team tackling challenges with no established blueprint, requiring creativity, persistence, and systems thinking.

Qualification and educational requirements

• Master’s degree or higher in nuclear engineering, nuclear and/or particle physics, astroparticle physics, fusion engineering or related field.
• Strong understanding of nuclear physics with a focus on interaction of fast neutrons with matter
• High proficiency with Monte Carlo neutronics tools such as OpenMC and MCNP or PHITS
• Demonstrated experience with advanced neutronics workflows (e.g., large-scale CSG models, DAGMC, CAD to CSG conversion, unstructured mesh) and application of variance reduction methods (e.g., weight windows)
• Experience with advanced data reduction and processing (NumPy, Pandas, Matplotlib, SciPy)
• Experience with working in Linux operating systems
• Proficiency in 3D CAD modelling tools (e.g. FreeCAD)
• Proficiency in 3-D meshing of CAD models