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Jobs at THORIZON (Now Hiring) — 12 open

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Join our Talent Pool

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission The energy transition needs solutions that are both ambitious and responsible. At Thorizon, we are developing a next-generation molten salt reactor designed to provide clean, reliable energy while making use…

Skills: Neutronics, Thermohydraulics, Safety and Licensing, Radioprotection, Mechanical Engineering

THORIZON logoTHORIZON

Senior Core Physics and Radiation Protection Engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission Are you passionate about core physics, radiation protection and criticality? Are you motivated to apply your expertise and know-how to the ongoing design studies for the Thorizon One reactor? Are you passion…

Skills: Core Physics, Radiation Protection, Criticality Simulations, MCNP, Serpent

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Process system engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior+

Your mission You will be the work package lead of some systems in Thorizon Pioneer related to nuclear processes and as such responsible for all activities related to design those systems in Thorizon Pioneer design and sa…

Skills: Process Engineering, Nuclear Engineering, System Engineering, PFD Design, P&ID Design

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Operations & Maintenance system engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior+

Your mission Are you motivated to provide your expertise and know-how to the ongoing design studies for the innovative reactors? Are you passionate about designing cutting-edge mechanical systems and solving complex engi…

Skills: Nuclear Operations, Maintenance Design, System Engineering, ALARA Methodology, Radioprotection

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AI-focused Data Architect

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission We are looking for a driven AI-focused Data Architect to join our innovative and international team. Are you motivated to provide your expertise and know-how in efficient data management to the ongoing desig…

Skills: Data Architecture, Data Engineering, Data Governance, AI Implementation, Knowledge Graphs

THORIZON logoTHORIZON

Senior thermal-hydraulics engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission Are you motivated to apply your expertise and know-how to the ongoing design studies for the Thorizon One reactor? Are you passionate about designing cutting-edge thermal-hydraulics systems and solving compl…

Skills: Thermal-hydraulics Engineering, CFD Techniques, System Engineering, Numerical Methods, Programming

THORIZON logoTHORIZON

Nuclear licensing engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission Are you motivated to provide your expertise and know-how to the ongoing design studies for the Thorizon One reactor to ensure a high level of safety and security, and to play your part in obtaining the autho…

Skills: Nuclear Safety Analysis, Regulatory Compliance, Licensing Strategy, Hazard Analysis, Failure Analysis

THORIZON logoTHORIZON

Nuclear safety analysis engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission Are you motivated to provide your expertise and know-how to the ongoing design studies for the Thorizon One reactor to ensure a high level of safety and security, and to play your part in obtaining the autho…

Skills: Nuclear Safety Analysis, Licensing Strategy, Hazard Analysis, Failure Analysis, Process Hazard Analysis

THORIZON logoTHORIZON

Core system engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior+

Your mission You will be the work package lead of the nuclear core system in Thorizon Pioneer and as such responsible for all activities related to design the core in Thorizon Pioneer design and safety case. In close col…

Skills: System Engineering, Nuclear Design, Nuclear Safety, Stakeholder Management, Project Coordination

THORIZON logoTHORIZON

Mechanical calculations engineer

Lyon, Auvergne-Rhone-Alpes, France · Hybrid

Senior

Your mission You will be responsible for mechanical calculation work for a system or part of the system related in Thorizon’s reactor design. You will be a key person of the calculation expertise center, whose primary mi…

Skills: FEM Simulation, Linear Structural Analysis, Structural Seismic Response, Thermal Stress Analysis, Fatigue Analysis

THORIZON logoTHORIZON

Mechanical Engineer

Lyon, Auvergne-Rhone-Alpes, France · On-site

Senior

Your mission You will be responsible for mechanically design a system or part of the system related in Thorizon’s reactor design. You will be a key person of the mechanical expertise center, whose primary missions are, o…

Skills: Mechanical Design, CAD 2D/3D, Structural Analysis, Thermo-mechanical Analysis, RCC-MRx

THORIZON logoTHORIZON

Office and HR assistant - Amsterdam Office

Amsterdam, North Holland, Netherlands · On-site

$20k–$35k/yr

Mid level

Your mission As Office & HR Assistant, you make sure things run smoothly in our Amsterdam office. You handle day-to-day HR administration, keep the office in good shape, and support the CEO with coordination when needed.…

Skills: HR Administration, Office Management, Executive Assistance, Onboarding, Event Planning

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Join our Talent Pool

THORIZON

Lyon, Auvergne-Rhone-Alpes, France • On-site

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Senior

Tired of cold applications?

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  • Full-time
  • Societal Impact, Professional Growth Opportunities, International Multidisciplinary Environment, High Level of Responsibility and Freedom
  • Posted 12d ago
  • ~40 hrs/week

Responsibilities

Contribute to the design, engineering, and safety assessments of next-generation molten salt reactors. Work across disciplines in a startup environment to develop clean energy solutions and handle complex technical challenges.

Requirements

Experienced engineer or technical specialist from a highly regulated industry such as nuclear, aerospace, or defense. Must possess technical excellence, intellectual humility, and the ability to operate effectively under uncertainty.

Full job description

Your mission

The energy transition needs solutions that are both ambitious and responsible.

At Thorizon, we are developing a next-generation molten salt reactor designed to provide clean, reliable energy while making use of long-lived nuclear waste as fuel. It is a challenge that sits at the intersection of engineering excellence, scientific curiosity, and long-term societal impact.

Joining our Talent Pool means becoming part of a community of engineers and technical experts who want to contribute to one of the most complex technological projects of our time.

Whether your expertise lies in neutronics, thermohydraulics, safety and licensing, radioprotection, mechanical engineering, systems engineering, chemistry, civil and layout engineering, electrical engineering, instrumentation & control, HVAC, or related disciplines, your work can help shape the future of energy.

The decisions we make today will influence technologies that may operate for decades. This requires technical rigor, thoughtful judgement, and a deep respect for the responsibility that comes with engineering systems that matter.

In this role you will:

Work on problems that do not yet have established answers.

As Thorizon grows, you may contribute to reactor design, engineering studies, safety assessments, system architecture, technology development, licensing activities, supplier engagement, testing programs, or future deployment projects.

You will work in a startup environment where:

  • Priorities evolve as we learn.
  • Responsibilities often extend beyond job titles.
  • Technical depth and practical execution are equally valued.
  • Progress requires collaboration across disciplines.
  • Decisions are made with incomplete information and refined as knowledge grows.

This is not an environment for people who need perfect certainty before taking action.
At the same time, this is not a place for shortcuts.

The challenge is learning how to move quickly while preserving the discipline, traceability, and quality required to build complex nuclear technology.

You will have opportunities to influence not only technical solutions, but also the way we work together, learn together, and build our culture as the company scales.

About you:

You are an experienced engineer or technical specialist with a background in a complex industry such as nuclear, aerospace, defence, semiconductors, chemicals, oil & gas, medical technology, or other highly regulated environments.

You bring expertise in one or more relevant domains, but you also understand that no single discipline can solve a challenge of this magnitude alone.

You are likely to recognize yourself in several of the following:

  • You combine technical excellence with intellectual humility.
  • You are willing to challenge assumptions, including your own.
  • You care more about finding the right answer than about being right.
  • You communicate openly, even when discussions are difficult.
  • You ask questions when something feels unclear or inconsistent.
  • You learn continuously and remain curious.
  • You take ownership of outcomes, not only tasks.
  • You value transparency, trust, and constructive feedback.
  • You can work through uncertainty without creating unnecessary drama.
  • You contribute to an environment where people feel comfortable raising concerns, sharing mistakes, and learning from them.
Most importantly, you understand that great engineering is never only about technology. It is about people working together with integrity, accountability, and respect for the consequences of their decisions.

About us

At Thorizon, we’re a passionate team spread across Amsterdam and Lyon, all working together to develop new nuclear power solutions. We design and create frontier technology for Molten Salt Reactors (MSRs).

Our purpose is to accelerate the availability of clean energy and help solve the climate crisis.

We are in the development phase and aim to solidify our design through analyses, simulations, experiments, prototyping, and partnerships. At Thorizon, we believe a strongly coupled multidisciplinary technology development requires a culture of full openness and transparency. That’s why we foster values like unity, communication, and support to ensure we grow together as a team while achieving our purpose.

Related keywords

Molten Salt ReactorNuclear EnergyEnergy TransitionNeutronicsThermohydraulicsRadioprotectionSystems EngineeringLicensingReactor DesignClean EnergyNuclear WasteStartupMultidisciplinary EngineeringSafety AssessmentsTechnical Rigor

About THORIZON

LinkedInVisit site

No Energy to Waste

Industry
Nuclear Electric Power Generation
Company size
11-50 employees
Founded
2018
Headquarters
Amsterdam, North Holland
LinkedIn followers
14,289

Nuclear without compromise - Thorizon is building a new generation of modular reactors to power industry, data centers and energy independence. Our molten salt technology is intrinsically safe and affordable. By using nuclear waste as fuel, we unlock far more value from the resources the world already has. Affordable power and high temperature heat - Thorizon is a European developer of next-generation small modular reactors. Our reactors provide reliable baseload power and high-temperature heat for industry. Their compact footprint and low-pressure operation enable deployment close to where it’s needed. Together with leading partners in energy and manufacturing, we are bringing the first Thorizon reactor to market. Designed for series production from day one.

Offices: Hekelveld 8, Amsterdam, North Holland 1012SN, NL · 27 Rue Maurice Flandin, Lyon, Auvergne-Rhône-Alpes 69003, FR

Nuclear energyEnergyNuclearResearchEnvironmentEnergy transitionDecarbonisationEngineeringPhysicsand Chemistry
View all jobs at THORIZON

About THORIZON

LinkedInVisit site

No Energy to Waste

Industry
Nuclear Electric Power Generation
Company size
11-50 employees
Founded
2018
Headquarters
Amsterdam, North Holland
LinkedIn followers
14,289

Nuclear without compromise - Thorizon is building a new generation of modular reactors to power industry, data centers and energy independence. Our molten salt technology is intrinsically safe and affordable. By using nuclear waste as fuel, we unlock far more value from the resources the world already has. Affordable power and high temperature heat - Thorizon is a European developer of next-generation small modular reactors. Our reactors provide reliable baseload power and high-temperature heat for industry. Their compact footprint and low-pressure operation enable deployment close to where it’s needed. Together with leading partners in energy and manufacturing, we are bringing the first Thorizon reactor to market. Designed for series production from day one.

Offices: Hekelveld 8, Amsterdam, North Holland 1012SN, NL · 27 Rue Maurice Flandin, Lyon, Auvergne-Rhône-Alpes 69003, FR

Nuclear energyEnergyNuclearResearchEnvironmentEnergy transitionDecarbonisationEngineeringPhysicsand Chemistry
View all jobs at THORIZON

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