On-Call Trainee, Process Engineering

Wärtsilä is an innovative technology company known for being a forerunner in the Marine and Energy markets. Every day, we - Wärtsilians - put our hearts and minds into turning Wärtsilä's purpose of enabling sustainable societies through innovation in technology and services into reality. Our ultimate aim is to provide increased value to both our customers and society. New, game-changing ideas and continuous improvement have been part of our DNA since 1834. Together, we can create new business opportunities and a more sustainable future that we can all be proud of.

We want to transition the world towards a decarbonised and sustainable future. By pushing the boundaries of engineering and technology, we can make it work. We are always on the lookout for future-oriented talent - want to join the ride?

We are looking for an On-Call Trainee, Process Engineering, with the main responsibility of supporting fuel systems process design activities. The preferred location for this position is Vaasa, Finland. We offer the possibility of hybrid work.

As an On-call Trainee, you can workup to 25 hours per week. The selected candidate needs to be a full-time student studying for a degreein Finland.

Your role and responsibilities

In this On-Call Trainee, Process Engineering role, your work will include designing P&IDs for fuel supply systems for LNG, methanol, and ammonia, performing thermodynamics and fluid dynamics simulations, defining technical specifications for process equipment (pumps, heat exchangers), and developing operating and functional procedures. The tasks can also be adjusted based on your individual skills and interests. You’ll be working as part of a young, international, and dynamic Fuel Gas Supply Systems Engineering team, and you will have an active role in shaping the decarbonisation of the marine industry.

To succeed in the position, we expect you to have:

• Ongoing B.Sc. or M.Sc. studies in the field of technology and engineering
• Experience with AutoCAD
• Good technical knowledge and problem-solving skills
• Ability to work independently
• A responsible, flexible, and proactive mindset
• Fluency in the English language, both written and verbal
• Good communication and collaboration skills
• Experience with process simulation software (Ansys, AFT Fathom) will be considered a plus

Why you and us?

We at Wärtsilä believe in empowerment, ownership, and taking responsibility for our work. We support each other’s growth, and co-creation is the true basis of our innovation. We have the courage to see opportunities and take initiative.

We are authentic and honest, and we strongly believe that by being your own true self, you can accomplish so much more. We don’t always get it right the first time, and if mistakes are made, we make sure to learn and grow from them. We want everyone to voice their opinions freely. That is why we have built an environment that empowers you and everyone around you, and where you can feel safe and cared for. Are you eager to be part of this ambition?

We have an amazing team, and we are excited about our work and the impact it has on building sustainable societies. We are looking for a colleague with this shared passion for smart technologies and a sustainable future.

Contact & next steps

We hope to hear from you soon and receive your application via our Careers portal. We aim to keep you updated throughout the process.

For further information regarding this position, please reach out to Paolo Casalotto, Manager, FGSS Process Engineering at [email protected] (only for questions from direct job applicants; applications sent by email will not be processed or responded to)

Welcome to join us in shaping the decarbonisation of marine and energy!

Last application date: 27/11/2026

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 www.wartsila.com.