Medior System Engineer – Process Systems

Do you want to contribute to the development of a new energy technology that can safely turn nuclear waste into emission-free energy? Are you excited about working in a hands-on deep tech start-up team that aims to make a huge impact? Do you like complex challenges? Then, we might be just the company you are looking for!

We are looking for a driven System Engineer to join an innovative and international team.

About the client

Our client designs and creates frontier technology for Molten Salt Reactors (MSR). They currently have a team of ~40 spread across Amsterdam and Lyon, all working together to develop nuclear power solutions. They are in the development phase and aim to solidify their design through analyses, experiments, simulations, and partnerships.

The primary location of the role will be in Lyon.

Your mission

As a Medior Engineer you will advance the design by strong cross-functional teamwork. You will deliver the design of specific reactor (sub)systems and components and interact with subcontractors and suppliers.

You have a strong content on nuclear technology, system engineering, with thorough technical background and experience on nuclear process system, heating/cooling system, knowledge on nuclear safety (knowledge of ISO 15288) and combine this with excellent teamwork, people and stakeholder management and communication skills.

Responsibilities

• Collaborate in cross-functional teams (~3-6 engineers) on development projects across nuclear engineering, core physics, thermal hydraulics, and chemistry.
• Focus on assigned systems/components, aligning quarterly priorities with long-term program goals.
• Define, validate, and optimize system requirements, balancing safety, reliability, performance, and cost.
• Initiate projects with expert engineers for analysis, validation, and qualification.
• Research technologies, select/qualify suppliers, and manage external contractors.
• Prepare system documentation, design reviews, and integration for licensing discussions.
• Conduct system/component design, safety, and performance simulations.
• Coordinate meetings, external communications, and lead specific projects.
• Work closely with the Nuclear Island System Lead, program office, COO, CTO, and teams in Lyon/Amsterdam.
• Report to the System Lead in the COO line.

Qualifications and Experience

• Experienced multidisciplinary engineer with 7+ years in nuclear system design (liquid or gas process systems).
• Knowledge and understanding of these disciplines are mandatory to succeed in the role: mechanical, neutronic, chemistry (corrosion), thermodynamic, structural
• Strong strategic and technical skills: connects design drivers to requirements, roadmaps, and objectives in complex projects.
• Excellent stakeholder management, ownership, and adaptability in fast-paced environments, with experience in scale-ups or new designs.
• Pioneer mindset, quick learner, and potential leader in complex topics.
• Master’s degree in engineering; fluent in English (French/Dutch a plus).
• Willing to travel between Lyon and Amsterdam.

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