Senior Full-Stack Developer

Wärtsilä; Vaasa; Hybrid; EUR 70,000 - 100,000; Full time

Job summary

Wärtsilä in Vaasa, Finland, seeks a Senior Full-Stack Developer to build and enhance our web-based tools for embedded automation. You will join an agile team and translate customer needs into effective workflows, with scope across frontend and backend.

The role requires a strong foundation in web technologies, a degree in computer science, 5+ years of experience with HTML/CSS, JavaScript/TypeScript and React, and fluent English.

Qualifications

• B.Sc. or M.Sc. degree in computer science or another relevant field.
• 5+ years hands-on experience with HTML & CSS, JavaScript/TypeScript, React (client-side and back-end).
• An open personality with good teamwork and communication skills.
• Experience with agile and design-driven development.
• Fluency in verbal and written English.

Responsibilities

• Specify and implement UX and back-end functionality for our control system maintenance tools.
• Develop unit and end-to-end tests for our application using Robot Framework.
• Develop and maintain test/build and release functionality related to the web application in our CI-system.
• Engage in discussions with colleagues in the development of ways of working within the area of web development.

Skills

HTML & CSS

JavaScript/TypeScript

React

Education

B.Sc. or M.Sc. in computer science

Job description

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 a Senior Full-Stack Developer with a main responsibility for developing our web-based tools for our embedded automation system. The preferred location for this position is Vaasa, Finland. We offer the possibility of hybrid remote work.

Your role and responsibilities

As a Senior Full-Stack Developer, you will interpret customer needs and translate them into effective workflows in our web-based tools. You will be part of an agile development team, working closely with colleagues in similar roles. Together, you will provide product management with technical input for the product roadmap. We value curiosity and a willingness to stay up to date with developments in your field, business trends, and the broader end-to-end product, including related development areas. The role can be adjusted based on your skills and interests.

Your work will focus on these responsibilities

• Together with your development team, specify and implement UX and back-end functionality for our control system maintenance tools
• Develop unit and end-to-end tests for our application using Robot Framework
• Develop and maintain test/build and release functionality related to the web application in our CI-system
• Engage in discussions with colleagues in the development of ways of working within the area of web development

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

• B.Sc. or M.Sc. degree in computer science, or another relevant field
• More than 5 years of hands‑on experience in relevant web technologies such as HTML & CSS, JavaScript/TypeScript, React etc. (both client‑side and back‑end)
• An open personality with good teamwork and communication skills
• Experience with agile and design‑driven development
• Ability to adopt to changes in a continuously evolving organisation
• Fluency in verbal and written English, our everyday work language is English

Why you and us?

We at Wärtsilä believe in empowerment, ownership. and taking responsibility of 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 to find a colleague with this shared passion for smart technologies and a sustainable future.

Contact & next steps

For further questions, please reach out to Matias Palmujoki, General Manager, Engine Controls, through [e-mail] 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: 13/09/2026

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.

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.

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.