---
title: 'Neutronics Engineer at Proxima Fusion'
canonical: 'https://feeny.ai/job/neutronics-engineer-proxima-fusion-munich-jjhp13rmyyhb'
type: 'job'
last_seen: '2026-09-05'
---

# Neutronics Engineer at Proxima Fusion

- **Company:** Proxima Fusion
- **Location:** Munich, Germany
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-01-06
- **Last confirmed live:** 2026-09-05
- **Apply:** https://jobs.ashbyhq.com/proxima-fusion/da3f7594-6803-4731-a657-db05abfa3401/application

**Skills:** OpenMC, DAGMC, CadQuery, Gmsh, Python, Git, CSG, CAD, Neutronics analysis, Nuclear data processing, Shielding design, C++, Cloud computing, HPC environments, Numerical simulations

> The Neutronics Engineer performs neutron and photon response analyses for stellarator optimization using OpenMC and DAGMC. The role involves automating simulation workflows, constructing CAD geometries, and validating results against experimental data to support licensing and operational safety.

## Job description

## WHO WE ARE

Proxima Fusion is Europe’s fastest-growing fusion company and the continent’s best-funded fusion player, as well as the first spin-out from the Max Planck Institute for Plasma Physics (IPP). Backed by over €650M and powered by a growing team across Munich, Zurich, and Oxford, we are developing the hardware and infrastructure needed to deliver the world’s first commercial stellarator fusion power plant.

Our concept advances the most mature fusion technology out there, the Wendelstein 7-X stellarator, through two next-generation machines: Alpha and Stellaris. Our work combines stellarator optimization, advanced computation, machine learning, and high-temperature superconducting magnets to unlock higher-performance designs that were previously out of reach.

Turning these designs into a functioning fusion power plant requires excellence and ownership across every discipline, from physics and engineering to software, manufacturing, law, and business functions.

## BY JOINING OUR TEAM YOU’LL GET TO

- Shape the architecture of the world’s first commercial fusion power plant – Own system-level decisions that determine how a first-of-a-kind energy technology is designed, integrated, and ultimately deployed at scale.
- Solve some of the most complex engineering challenges – Work across tightly coupled disciplines (plasma physics, magnets, cryogenics, manufacturing, controls, and more) to resolve critical trade-offs and turn cutting-edge science into a functioning product.
- Design real hardware with a pragmatic, fast-moving team from all over the world – Combine advanced simulation and systems thinking with a strong execution mindset, focusing on practical engineering solutions that accelerate the path to commercial fusion energy.

## YOUR IMPACT

As a member of the neutronics group you will play a critical role in advancing our stellarator design.

Your work will focus on analysis required for licensing and operational safety of the Alpha stellarator.

You will carry out reproducible neutronics simulations and automate neutronics simulation workflows. Simulations include producing shutdown dose rate maps, unstructured mesh magnet heating, tritium breeding, DPA, activation, using both CSG and CAD-based neutronics models.

The role provides a unique opportunity to work as part of an integrated design effort including machine learning experts, software engineers, fusion scientists, and fusion engineers, making a tangible impact on the future of clean energy.

## WHAT YOU WILL DO

- Perform neutronics analysis using OpenMC and DAGMC for a range of neutron and photon responses important for stellarator optimization and design.
- Contribute to the integration of neutronics analysis into automated pipelines, including programming in Python (essential skill), using version control (Git/Graphite) within a Docker environment, Programming in C++ is considered a benefit.
- Perform verification and validation by comparing simulation results obtained with OpenMC to other codes and experimental data.
- Construct simulation ready CAD with CadQuery and CSG geometries of the stellarator and surrounding facility.
- In addition to developing in-house neutronics workflows, you may have opportunities to contribute to open-source codes we depend on for nuclear data processing, CAD conversion / meshing, and particle transport simulations.

## WHO YOU ARE

- A PhD or Master’s degree in nuclear physics, nuclear engineering, or equivalent experience.
- Experience in processing nuclear data.
- Experience with the main codes that we use (OpenMC, DAGMC, CadQuery, Gmsh) for neutronics analysis.
- Experience designing neutron and gamma shielding.
- Experienced Python programmer using software development tools such as Git
- Experience with computation in cloud or HPC environments involving numerical simulations (desirable).

## INTERVIEW PROCESS

- Recruiter Interview (30-60 min)
- Technical Screening (30 min)
- Technical Panel (3x60 min)
- CEO call (30 min)

This role sits at L2/L3 of our framework, please inquire during the recruitment process for further information*

At Proxima Fusion, our mission is bold: making limitless clean energy a reality. To get there, we need a high-performing, diverse team that brings different perspectives, challenges assumptions, and builds together with purpose. We know that diversity of thought and experience leads to better ideas, stronger execution, and a more resilient team. We don’t look at how you identify, what you look like, who you choose to worship or what ethnicity you are. We care about what you can bring to the table.

## About Proxima Fusion

## Company Overview
- **One-liner**: A European fusion energy company building quasi-isodynamic stellarator power plants to deliver clean, safe, and abundant energy.
- **Entity Type**: Private (Series A – €130M raised in June 2025 plus €15M extension in September 2025)
- **Headquarters**: Munich, Germany (additional offices in Zürich, Switzerland and Oxford, United Kingdom)
- **Founded**: April 2023
- **Founders**: Francesco Sciortino, Lucio Milanese, Jorrit Lion, Jonathan Schilling, Martin Kubie

## Core Business
- **Primary industry**: Fusion energy (energy production)
- **Target customers**: Energy companies, grid operators, and technology partners (B2B / Enterprise)
- **Mission**: “Enabling human ambitions in a future with fusion energy” – providing abundant, clean, and safe energy for all.

## Products & Services
- **Alpha Demonstration Stellarator**: A prototype stellarator designed to demonstrate net energy gain in steady-state, planned for first plasma around 2031.
- **Stellaris Fusion Power Plant Concept**: A peer-reviewed, first-of-its-kind design for a commercial stellarator fusion power plant, targeting grid deployment in the late 2030s.
- **Stellarator Model Coil (SMC)**: A demonstration high-temperature superconducting (HTS) magnet completed to validate coil technology for Alpha and Stellaris.
- **Core Technology**: Quasi-isodynamic (QI) stellarator design combined with computational optimization, HTS magnets, and rapid prototyping – all leveraged from the record-breaking Wendelstein 7-X experiment.

## Market Standing
- **Valuation / Market Cap**: Not publicly available (private company)
- **Key Metric**: Total funding ~€200M (≈$230M) in public and private capital, including pre-seed (€7.5M), seed (€20M), Series A (€130M + €15M extension), and additional grants from the European Innovation Council and the German Federal Ministry of Education and Research.
- **Notable Investors / Partners**: Plural Platform, UVC Partners, redalpine, Bayern Kapital, DeepTech & Climate Fonds, Max Planck Foundation, High-Tech Gründerfonds, Visionaries Club, Wilbe. Strategic partners include the Max Planck Institute for Plasma Physics (IPP), Karlsruhe Institute of Technology (KIT), and Paul Scherrer Institute (PSI).
- **Growth Signals**: Team grown from founding to 100+ world-class scientists, engineers, and operators; completion of the Stellarator Model Coil; publication of the Stellaris power plant concept; convening an Industrial Development Board to scale European fusion supply chains; appointment of CFO Sergei Galperin (June 2026); integration of AI-driven design methods.

## Competitive Advantages
- **QI Stellarator approach**: Toroidal currents cancel to zero, enabling inherently stable, continuous operation without the plasma disruptions that challenge tokamaks.
- **Direct lineage from W7-X**: As the first spin-out from the Max Planck Institute for Plasma Physics, the team builds on decades of stellarator research and the world’s most advanced stellarator experiment.
- **Simulation-first + rapid prototyping**: Combines cutting-edge computational design with HTS magnet technology to accelerate development timelines.
- **Top-tier talent pool**: Team members from Max Planck IPP, MIT, SpaceX, Tesla, McLaren, Google X, EPFL, Stanford, Cambridge, and other leading institutions.
- **Deep European ecosystem ties**: Close collaboration with public research institutes, industrial partners, and government funders.

## Strategic Focus
- **Near-term (2026–2031)**: Complete the design and construction of the Alpha demonstration stellarator, demonstrate net energy in steady-state, and advance HTS magnet technology through continued R&D.
- **Mid-term (2030s)**: Scale from Alpha to the Stellaris fusion power plant, targeting first electricity to the grid in the late 2030s.
- **Long-term**: Establish a new clean energy infrastructure by industrializing stellarator power plants and securing supply chains across Europe.

## Why Work Here
- **Mission with impact**: Tackle one of humanity’s greatest challenges – unlimited, clean, and affordable energy.
- **High-performance culture**: Described as a “professional sports team” where success depends on placing the right person in the right role with real ownership from day one.
- **Collaborative environment**: Work alongside exceptional peers from top tech, science, and engineering organizations; take on meaningful responsibility early.
- **Locations**: Offices in Munich (HQ), Zürich (PSI campus), and Oxford (Culham Campus) – likely on-site given the hands-on nature of fusion R&D.
- **Diverse disciplines**: Opportunities for engineers, scientists, operators, and business roles in a fast-growing deep-tech startup.

## Sources
1. [proximafusion.com](https://www.proximafusion.com/)
2. [proximafusion.com/about](https://www.proximafusion.com/about)
3. [proximafusion.com/careers](https://www.proximafusion.com/careers)
4. [jobs.ashbyhq.com/proxima-fusion](https://jobs.ashbyhq.com/proxima-fusion)
5. [en.wikipedia.org/wiki/Proxima_Fusion](https://en.wikipedia.org/wiki/Proxima_Fusion)

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