Seaborg Technologies is a start-up on the forefront of advanced and innovative nuclear reactor technology working to provide abundant, affordable and sustainable energy to the world. We have grown to become the leading molten salt reactor start-up outside of North America with an international team of 20 employees from four continents. We are actively developing the design for our Compact Molten Salt Reactor, alongside licensing and experimental validation activities of key safety and performance claims, and are currently planning a multi-million salt lab to accelerate these efforts. We are engaged with multiple stakeholders in the growing advanced reactor supply chain, primarily in East Asia.


Our success is entirely due to our brilliant and passionate team of employees and experienced advisers - a team we are currently in the process of expanding with more world-class talent determined to create positive change in the world.


We are hiring an experienced nuclear systems design engineer to take a central role in our reactor development efforts. The successful candidate will work to conceptualise, design, analyse and specify systems, structures and components (SSC) comprising the molten salt reactor plant, as well as experimental validation campaigns. She/he will systematically explore and assess different design solutions using goal and function-based methodologies, to evolve the baseline reactor design in an evidence-driven manner. The position will collaborate closely with our safety, reactor physics and chemistry departments to ensure due consideration of important phenomena and safety considerations across all relevant disciplines. Additional interfaces will be maintained with business development to synchronise technical development with the specific desires of the customer. Some international travelling should be expected.


Given appropriate experience and satisfactory performance, the hired candidate will be considered for VP of Engineering.


Seaborg employees must be able to act proactively and independently to perform a wide variety of functions that do not always correlate with experience or expertise (such as writing job advertisements). That being said, the advertised position is expected to include at least some of the following responsibilities and tasks:

  • Plan, organise and lead the work of interdisciplinary reactor development teams to identify, assess and validate solutions to complex engineering challenges;

  • Conceptualise and assess feasibility of design solutions;

  • Design and document SSC comprising the reactor plant;

  • Develop, maintain and document holistic plant overview with system interfaces and dependencies;

  • Support and assess the design of experimental campaigns to test and validate design hypotheses;

  • Pursue compliance with regulatory requirements, including identifying applicable standards and codes for radioactive salt-bearing SSC;

  • Interface with a wide range of stakeholders, including regulatory authorities, customers, investors, partners, and representatives of various supply chains;

  • Prepare written and verbal design descriptions to internal and external stakeholders, in accordance with internal quality requirements;

  • Assess costs, availability, validation and qualification requirements and schedule, and more, of SSC to inform decision making;

  • Support planning of R&D activities to develop design, including scheduling, costing, and establishing decision criteria;

  • Train new employees and interns from around the world;

  • Support IP development and acquisition activities.


  • Desire to positively change the world by shaping the energy landscape of tomorrow;

  • Demonstrated ability to creatively and diligently approach and solve challenging tasks within time and budgetary constraints;

  • MSc or higher in nuclear, mechanical, process or systems design engineering, or similar;

  • Experience from nuclear industry, including familiarity with nuclear safety and security concepts;

  • Demonstrated experience designing nuclear systems;

  • Management experience and leadership qualities necessary to be considered for VP of Engineering;

  • Experience with reactor physics and/or FEA software to analyse and substantiate design decisions;

  • Expert CAD practitioner;

  • Team player with effective communication and interpersonal skills, including fluency in English;

  • Ability to travel by plane and communicate outside of normal working hours when necessary.


At Seaborg we strongly value the combination of relevant experience, talent and personality traits that align with our team and overarching vision for a sustainable future. We therefore encourage applications from diverse backgrounds and are prepared to mould the job description to accommodate well-aligned candidates.


While our team is still small, our ambitions are not. Becoming a part of Seaborg presents a unique possibility to importantly impact and define the global energy landscape of tomorrow. We know that new ideas and influences are key to challenge the status quo and strive for continuous improvement, and so new hires can expect to importantly contribute to shaping both the technology and the future of the company.

We want to play an active role in enabling the personal and professional development of all employees so that they can evolve and grow to take on changing tasks and responsibilities. To give room for this development, we practice high work flexibility in an informal, merit-based environment without strict hierarchies. With time, we expect every employee to become an invaluable part of Seaborg and our success, and we underpin this expectation by offering all new employees stock options in the company.


We are based in Denmark, a country known for its high quality of life and extensive social welfare system. That means free health care and education, generous vacation arrangements, progressive maternity and paternity leave provisions, etc. More on this at


Our office is situated centrally in Copenhagen - a young and vibrant European capital on the Øresund coast with a thriving expat community and world-leading bicycle infrastructure.



Please note that we no longer accept applications for this position.

However, if you think you would be an outstanding candidate for a similar position in the future, feel free to let us know by sending an email to

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 © 2020  Seaborg Technologies

Titangade 11

2200 Copenhagen N