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As a Mechanical Design Engineer or Numerical Modelling Engineer at Hephaestus Technologies, you'll be at the forefront of fusion energy innovation, leading detailed design and simulation work that pushes the boundaries of what's possible in extreme environments, ideal for someone who thrives on complex problem-solving and enjoys a blend of theoretical and practical challenges.
Original posting from Hephaestus Technologies
About Us
We are a fusion energy startup based in London. We are a combination of physics, engineering, materials science and computer science talent. We are a high-calibre team intentionally maintaining a low profile; we prioritise performance over the performative. You will have real ownership from day one of problems, decisions, and outcomes - alongside meaningful equity. In return, we hope to see driven and rigorous work. Our colleagues keep a critical eye on all decisions, want to support one another and can adapt to working on new tasks as the need arises. We invite applications from a diverse range of backgrounds to give a range of perspectives as we race towards bringing innovative, complex engineering solutions to market. This environment is designed for people who want to do extraordinary work with the potential for extraordinary impact.
Role
(1) Mechanical Design Engineer (Structural & Electromagnetic Analysis Focus) / (2) Numerical Modelling Engineer (make clear 1 or 2 in application)
Summary
We are seeking a skilled Mechanical Engineer to lead detailed design and advanced simulation work. You will join a team supervised by a Senior Engineer and advised by colleagues who designed some of the highest-performance tokamaks in the world. The role focuses on creating high-fidelity CAD models, performing structural finite element analysis (FEA), and conducting electromagnetic modelling to support innovative product development for extreme environments.
We are seeking a Numerical Modelling Engineer to advance the design and performance of our electromagnetic systems through high-fidelity, physics-based simulations. You will develop robust numerical frameworks that combine commercial multiphysics tools with internally developed models, enabling fast and reliable engineering decisions. Your work will focus on modeling electromagnetic, thermal, and transient multiphysics behavior to drive design optimization for conductors, coils, and protection systems.
Key Responsibilities
- (1)
- Perform 3D CAD design and detailed modelling of mechanical components and assemblies using industry-standard tools like Fusion360
- Carry out thermal and structural analysis and assessment of mechanical designs, providing design input and implementing recommended design improvements.
- Execute electromagnetic modelling and simulation using tools like COMSOL Multiphysics. Optimize designs based on simulation results to meet safety, performance, reliability, and manufacturability targets.
- Collaborate with other engineers (electrical, systems, manufacturing) to develop integrated designs.
- Work with external suppliers and collaborators to assist and guide the development and manufacture of the components and systems that will come together
- Prepare technical reports, documentation, and presentations of analysis results.
- (2)
- You will develop predictive models across steady-state and transient regimes.
- Electromagnetic Simulation: Analyze magnet systems to evaluate current distribution, inductance, AC losses, and nonlinear magnetic properties.
- Thermal Modeling: Simulate heat generation, conduction, and cryogenic cooling performance under realistic operational conditions.
- Multiphysics Build and validate coupled FE models to capture transient effects such as current redistribution and localized heating.
- Instability Modeling: Implement and validate numerical frameworks to simulate quench initiation, propagation, and protection strategies.
- Collaborate with design teams to validate models and integrate insights into system development
Qualifications & Skills
- (1)
- MSc degree in Mechanical Engineering, Mechatronics, or a closely related field.
- 1-3+ years of relevant experience, ideally in industries involving magnetic systems, actuators, motors, sensors, or high-precision equipment.
- Experience in designing and delivering the conceptual and detailed design of mechanical, structural, thermal or electro-mechanical equipments
- Understanding of mechanical engineering fundamentals, materials selection, and tolerance analysis
- Familiarity with multiphysics simulation environments.
- Excellent problem-solving skills and attention to detail.
- Ability to work independently and in a small team
- (2)
- Degree (MSc or PhD) in Mechanical Engineering, Applied Physics, Computational Engineering, or a related field.
- Proven experience in multiphysics and transient simulation, particularly electromagnetic–thermal coupling.
- Proficiency in at least one scientific programming language (Python, MATLAB, C++, or similar), with interest in developing internal modeling tools and workflows.
- Hands-on experience with electromagnetic FEM modeling using COMSOL or equivalent commercial multiphysics platforms.
- Experience in thermal modeling and heat transfer in complex systems.
- Excellent analytical skills and physical intuition, with the ability to connect simulation outcomes to system-level design and performance.
Source: Hephaestus Technologies careers