TechSim mathematical modeller

A safer, low-carbon shipping industry is underpinned by data sharing. We at Wärtsilä Voyage are creating the digital infrastructure needed to enable high-performing maritime logistics. Through our world-leading Smart Marine portfolio, we support our customers in their efforts to ensure secure, highly energy-efficient and cost-effective marine operations.

Wärtsilä is on a mission to enable sustainable societies through innovation in technology and services. As we change course towards a cleaner, smarter maritime future, we're looking for top talent to join our team. Are you ready to join the Voyage?

Wärtsilä Voyage Belgrade as a part of Wartsila Voyage is a high-tech, modern development centre, which has dozens of unique specialists. The company actively uses flexible development methodologies, a developed technological culture allows creating unique technical solutions.

We create integrated technological solutions to improve the safety and efficiency of shipping, navigation, and ship operations:

Team of Wartsila marine engineering simulators is looking for mathematical modeler. You can become part of a team which works on a market leader product (45% market share) that imitates marine engineering functionality for vessels.

This permanent position is in Belgrade, Serbia.

Main responsibilities:

• Develop from the scratch for dynamic math models of vessel equipment and systems.
• Create front-end side of simulators.
• Compile technical documentation for these models.
• Maintain existing models.
• Take a part in agile activities.

To be successful in this position, we expect you to:

• Bs or MS in physics, applied math, engineering or similar field.
• Practical experience in imitation modelling of physical systems.
• Basic knowledge of numerical methods for solving PDE and DAE.
• Basic knowledge of OOP approach or any OOP language.
• Be able to formulate a problem correctly and plan ways to solve it.
• English intermediate or higher.
• Be agile.

We will be amazed if you have (but not mandatory):

• Be familiar with Open Modelica or any Modelica-based language.
• Be able to quickly master new tools.
• Have a background in marine engineering.

Practical experience in imitation modelling:

• Hydraulics (gravity flow, pumping through pipeline, pump characteristics, pipeline elements' resistance, Bernoulli equation, two-phase media flow (liquid + gas)).
• Heat Transfer (heat capacity of materials – solid, liquids, gases; heat exchange between various media; temperature transfer & temperature resistance of materials).
• Thermodynamics (ideal gas laws; real gas specifics; main thermodynamics parameters and characteristics, its interdependencies; thermodynamics laws; phase transitions).
• Mechanics (kinematics and dynamics of rigid body, rotational dynamics equations; mechanical energy parameters and equations, mechanical energy transitions, inertia characteristics; simple mechanisms).
• Automation and regulation (main principals and parameters; governors (controllers) – main types and work principals; controlled system parameters and dynamic).

Why you and us:
You are valued – as your true self. At Wärtsilä YOU matter. We value diversity and are committed in supporting inclusive work community.

Your growth is supported. We believe in continuous learning & teamwork. Wärtsilian community has your back when it comes to development opportunities – so you can develop beyond your potential.

You get to make a difference. Innovation and sustainability are important for us. Every day, we - Wärtsilians - put our hearts and minds into enabling sustainable societies through innovation in technology and services into reality.

Last application date: 04/12/2025

At Wärtsilä we value, respect and embrace all our differences, and are committed to diversity, inclusion and equal employment opportunities; everyone can be their true self and succeed based on their job-relevant merits and abilities.

Please note that according to Wärtsilä policy, voluntary consent for a security check may be required from candidates being considered for this position, depending on the applicable country.

This is Wärtsilä
Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. Our team of 18,300 professionals, in more than 230 locations in 77 countries, shape the decarbonisation transformation of our industries across the globe. Read more on