Mechanical Commissioning Engineer

Wärtsilä Energy leads the transition towards a 100% renewable energy future. We help our partners to accelerate their decarbonisation journeys through our market-leading technologies and power system modelling expertise. These cover decarbonisation services, future-fuel enabled balancing power plants, hybrid solutions, energy storage and optimisation technology, including the GEMS Digital Energy Platform.

Did you know Wärtsilä has delivered 79 GW of power plant capacity and more than 130 energy storage installations in 180 countries around the world?

In this fast-changing world of energy, we 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. Want to join the ride?

We are looking for a Mechanical Commissioning Engineer who will be at the heart of bringing Wärtsilä Energy projects to life. Your main mission will be planning, leading and managing mechanical construction and commissioning activities on-site, ensuring everything runs smoothly from installation through to final handover.

Your role and responsibilities 

As a Mechanical Commissioning Engineer your work will include taking ownership of mechanical installation and commissioning plans and delivering them with precision, while leading and inspiring the mechanical team to achieve high performance and strong collaboration. Communicating confidently with a wide range of stakeholders will be a key part of your role, ensuring alignment and clarity throughout the project.

This is an opportunity to work on challenging and rewarding projects across the globe, alongside a talented team representing many cultures and perspectives. Every day, you will be contributing to shaping a more sustainable energy future.

In this role, you spend approximately 250-300 days abroad per year. Please note that relocation costs and/or immigration support are not available for this position. We offer you an interesting role in challenging and rewarding projects globally. In this position, you can work in a successful team with people from many cultural backgrounds. This is a permanent position, and the preferred location for the role is Vaasa, Helsinki, or Turku, Finland.

Your work will focus on these responsibilities:

General:

• Planning and monitoring the progress of mechanical works at the site
• Proactively managing scope, material flow, and securing necessary resources
• Managing and guiding subcontractors
• Planning and coordinating Last Planner System (LPS) activities with subcontractors and monitoring progress
• Facilitating root cause analyses and resolving constraints in mechanical works
• Contributing to project schedules and maintaining accurate reporting
• Maintaining strong customer relations and team spirit on-site
• Promoting economical construction and cost-saving working practices
• Ensuring mechanical as-built drawings are completed and communicated
• Safeguarding compliance with HSSE policies and minimising risks in mechanical installations and commissioning

Construction & installation:

• Coordinating construction and installation works with Civil and Electrical disciplines using LPS methods
• Ensuring design and installation instructions are adhered to
• Arranging inspections of received materials and goods
• Reviewing invoices from subcontractors and suppliers
• Maintaining records of change orders and claims
• Organising and leading weekly mechanical site meetings
• Ensuring quality control at the site
• Advising and supporting the client in planning, organising and executing tests

Testing & commissioning:

• Managing and planning safe inspections and test procedures
• Instructing supervisors and subcontractors on accepted test methods and equipment
• Ensuring testing of installed equipment and documenting results
• Managing punch lists
• Ensuring all required documents are submitted and signed by the customer for plant handover

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

• A degree in Mechanical Engineering or a related field, or equivalent professional experience
• Solid experience in mechanical installation and commissioning, preferably within power plants or large industrial projects
• Excellent communication skills and confidence in working with both internal and external stakeholders
• Strong interpersonal and negotiation skills for dealing with subcontractors and customers
• An organised approach with attention to detail and the ability to prioritise under pressure
• HSSE awareness and the ability to enforce safety standards on-site
• Flexibility and resilience to work abroad for extended periods (250–300 days per year)
• Proficiency in English, both written and spoken

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 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 who shares our passion for smart technologies and a sustainable future.

Contact & next steps

We hope to hear from you soon by submitting your application through our Careers portal. We will be conducting interviews with qualified candidates throughout the process and aim to keep you informed along the way.

For further questions, please reach out to Jukka Ala-Aho, Manager, Installation & Commissioning Mechanical, via email at jukka.ala-aho@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). 

Last application date: 31/08/2026

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.