Scientist Dynamic Energy System Modelling and Optimization | Rijswijk

You will be working in the Energy System Modelling team within the department Heat Transfer and Fluid Dynamics. This team focuses on modelling and optimization of energy assets and infrastructure (hydrogen, natural gas, CO2, electricity). We hold a worldwide leading position on integral design and operational optimization for energy system modelling.

We apply this knowledge to advise companies and governments on how to optimally implement tomorrow’s energy carriers in their networks. Examples of such projects include North Sea Energy, HY3+ and Shimmer. Our range of projects combine fast-paced business-to-business with deep research in long-term collaborations.

In this role, you will translate complex problem definitions into clear and workable models that form the foundation of our analyses. You will contribute to the ongoing development of PyDOLPHYN, our in house tool for dynamic asset modelling, helping to enhance its capabilities and ensure it meets the evolving needs of our projects. Throughout your work, you will maintain close interaction with clients—discussing their questions, identifying the necessary input data, and agreeing on the most suitable modelling approach. After the simulations are properly setup and run, you will dive into the results, analyse system behaviour and performance, discuss outcomes with the team and present your findings to clients and stakeholders in a clear and compelling way.

Our modelling activities on energy systems will expand in various directions in the coming years, including further integration of:

• Future proof energy systems, including resilience aspects and uncertainty quantification.
• Multi-commodity energy systems, including heat, hydrogen and natural gas and electricity.
• Physical and market models for energy components/assets.

The research group is internationally oriented in both projects as well as its team members. English is our working language. You will be working in a highly motivated team who finds innovative solutions for complex challenges. The team has experts that know how to design, optimize and control digitalized, multi-commodity energy networks, based on physics, for our current and future energy systems. Next to content, the team has an eye for social interactions besides work. In addition, it is likely that you will work with experts from different departments within the Netherlands.

You possess strong analytical skills and are able to understand complex mathematical problems, translating them into high quality software solutions and clear insights. In your collaboration with clients and partners, you communicate clearly and effectively, while remaining open to new ideas and perspectives. You enjoy working in a team and have a demonstrated affinity with energy system modelling, particularly with physical network systems.

Other skills and knowledge you bring to TNO:

• A Master’s or PhD degree in Mechanical Engineering, Systems and Control, Aerospace Engineering, Electrical Engineering, Applied Physics, Applied Mathematics, or a similar field.
• A background in optimization.
• Python programming experience.
• Nice to have: experience with version control software such as Git.
• Familiarity with electricity network modelling is a plus.

Challenging and varied work with a real impact. And plenty of opportunities as, at TNO, you are in charge of shaping your career. We offer a gross monthly salary between € 3,500 and € 4,100 (based on your knowledge and experience), 8% holiday pay, a 13th month bonus of 8.33% and a flex budget (5.58% + € 180). In addition, you will be given every opportunity to develop yourself.

TNO offers optional employee benefits, enabling you to tailor your benefits package to match your personal situation. You may also expect:

• An extremely professional, innovative working environment where colleagues are leading experts in their field.
• The opportunity to attend courses, workshops and conferences, and to receive training and coaching based on your needs.
• 34 days annual leave on a full-time basis.
• An employer that values and encourages diverse talent, with initiatives like the Female Leadership Program, our Rainbow Community and round tables on inclusion topics.
• We offer a comprehensive and flexible mobility plan that also includes full compensation for public transportation for commuting and business travel.
• Great social events with your team and other TNO colleagues. That’s how you will get to know a lot of people really quickly.
• Flexible working hours, the possibility to work parttime (32 of 36 hours) and the possibility of working from home.
• Access to our Talent Development Programme.
• Networking opportunities and great activities organized by Jong TNO.
• Extensive relocation package for international candidates.
• A good pension scheme.

Read more about tailoring your benefits package.

At TNO, we innovate for a healthier, safer and more sustainable life. And for a strong economy. Since 1932, we have been making knowledge and technology available for the common good. We find each other in wonder and ingenuity. We are driven to push boundaries. There is all the space and support for your talent and ambition. You work with people who will challenge you: who inspire you and want to learn from you. Our state-of-the-art facilities are there to realize your vision. What you do at TNO matters: impact makes the difference. Because with every innovation you contribute to tomorrow’s world. Read more about TNO as an employer.

At TNO we encourage an inclusive work environment, where you can be yourself. Whatever your story and whatever unique qualities you bring to the table. It is by combining our unique strengths and perspectives that we are able to develop innovations that make a real difference in society. Want to know more? Read what steps we are taking in the area of diversity, equity and inclusion.

Please apply before the 22nd of March, 2026. The selection process comprises two interview rounds. The preliminary interview takes place on March 31st, 2026. The second interview round has been scheduled for April 7th, 2026. In a final meeting we will discuss the terms of employment and your tailored benefits package. We aim to finalize the entire process within four weeks.

The selection process may include an online assessment and a reference check.

A certificate of Conduct (VOG) is required before starting a new job at TNO.