Wärtsilä is a world leader in marine technology and leading the industry's transformation towards a decarbonised and sustainable future. With the world’s widest portfolio and service network, we – Wärtsilians - deliver efficient, safe and sustainable integrated products and solutions to enhance the business of our customers. The opportunities presented through digitalisation and new technologies are offering a new era of shipping. Did you know that shipping is the world’s most efficient mode of transportation and that 88% of the world's trade is carried by sea?

We want to change the course towards an interconnected and cleaner maritime future and are constantly on the lookout for future-oriented talent to join our team and to work towards enabling sustainable societies through innovation in technology and services - together. Are you ready to jump onboard?

We are now looking for a Senior Software Developer to join our skilled and supportive Data Science platform and operations team (of seven people) working for a better future.

The preferred location for the position is Helsinki, Finland. We offer the possibility of hybrid work.

What you will be doing

In this position, your work will include maintaining infrastructure for processing maritime data and close collaboration with teams working on customer-facing applications like the Fleet Operations Solution (https://www.wartsila.com/marine/voyage/fleet-operations-solution). On a typical day, you might start by writing Python code to improve internal tools and end the day with investigating delayed data. You will not be working on this alone, even though the work requires a high level of independence, as you will have support from your teammates, both developers and data engineers.

By enhancing our data processing capabilities, you'll help shipping companies reduce their carbon footprint. Your work will directly contribute to real-world fuel savings, saving thousands of tons of fuel annually across our client fleet. By helping our customers save fuel we help decarbonize the marine industry.

For us to be the best match, we expect you to have an understanding of Python ecosystem and experience from working with Docker and Kubernetes. As an ideal candidate, you have gained experience from working with a large codebase. Good debugging and system design skills will help you to succeed in this position.

As Senior Software Developer, you will focus on these responsibilities:

• Proactively interacting with stakeholders to figure out requirements
• Implementing features to our existing Python-based services and tools
• Debugging and solving production service issues
• Closely working with data ops engineers in our team to smooth the delivery of statistical models and data to our customers
• Supporting developers, data scientists and analysts in other teams using our platform

You will shine in this role when you have:

• Curiosity and a willingness to learn
• A capability to listen well and proactively ask the right questions to understand how and why systems works as they do
• The motivation to modernize our existing stack processing telemetry data from oceangoing vessels
• Experience as a Python developer with core competencies including Linux operating systems, Kubernetes and automated testing
• The ability to express yourself clearly and have a good command of both written and spoken English
• Good habits of maintaining and creating useful documentation
• Experience working with time-series data and / or dataflow computing

In addition to these main responsibilities, the role can include anything else you'd like to do in the team. Want to develop application monitoring, metrics and logging? You can. Want to improve team Agile ways of working? You can. Interested in Kalman filters and Gaussian processes? All the better. Or do you just want to concentrate on the core development competencies? Great! You'll be working with a group of developers and data engineers on various projects requiring programming skills mostly related to Python.

Why you and us?

We take pride in our culture and community. Our team is one of nine teams part of the Wärtsilä Marine Voyage Services R&D Optimization release train.  In our organization a team is the smallest unit of operation. We set our team goals, define our ways of working, and have a say in the tools we use in our work. We are a self-organized team of closely collaborating team members. Dailies, pair-coding, and code review, for example, are important ways we cooperate. We also have a gang of agile coaches available who we can ask for support in developing our everyday practices and teamwork.

Most of our team members have a developer or engineer background and our hobbies and interests include games of all sorts, bouldering, books, circus, cooking, and, of course, sailing. If you enjoy these as well you should fit in just right!  And in case you have experiences and interests to add to the list, even better! Our working language is English, but you'll find folks to chat also in Dutch, Chinese, Finnish, Swedish and Russian to name a few.

Our working culture is flexible and based on trust. We appreciate people having different life situations and styles and believe that work should adapt to our personal lives and not the other way around. We have always supported the possibility to work remotely and expect people to manage their own work responsibly. It's important for us that you find this team as a place to grow and develop your career aspirations in a friendly and inclusive environment.

Contact & next steps

We hope to hear from you soon, by submitting your application through our careers portal. We aim to keep you updated on the process throughout. 
Thank you for submitting your application as soon as possible. We make a continuous selection and may close the recruitment before the advertisement has expired.

For further questions please reach out to Joris, Lead Data Science, through email joris.vanagtmaal@wartsila.com with any questions related to this position (only for questions from direct job applicants, applications through email will not be recorded or responded to).

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

Last application date: 20/10/2025 

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.

All new Wärtsilä employees in Finland will attend occupational health checks, including drug tests/screenings where applicable. When a person is located outside of Finland, the country legislation is followed.

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. 

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