Mechanical Supervisor / Commissioning Engineer

Wärtsilä; Madrid; On-site; EUR 90,000 - 130,000; Full time

Job summary

Wärtsilä Energy is seeking a Mechanical Supervisor / Commissioning Engineer to lead mechanical installation, commissioning, and handover activities for power plant projects. The role involves frequent site work abroad (approx. 250–300 days per year) with home office options in Portugal or Spain.

The successful candidate will supervise subcontractors, ensure schedules, manage testing, and maintain HSSE compliance while delivering quality handover documentation across global sites.

Qualifications

• Clear ability to supervise mechanical installation and commissioning activities.
• Strong understanding of codes and standards in mechanical engineering.

Responsibilities

• Supervise scope of work and material flow at site.
• Guide mechanical subcontractors on site and maintain customer relations.
• Execute startup and tests of equipment within the contract scope.
• Ensure test results are documented according to Wärtsilä instructions.
• Maintain HSSE compliance and safe installation practices.
• Coordinate documentation, as-build drawings and handover packages.

Skills

Good communication

Team building

Leadership

Analytical mind

Willingness to learn

Adapt to new technologies

English proficiency

Cross-cultural collaboration

Education

B.Sc or M.Sc. in Mechanical Engineering

Job description

We are now looking for a Mechanical Supervisor / Commissioning Engineer to join our team working for a better future.

The position may be offered on either a permanent or fixed-term basis, depending on the specific circumstances of each case.

You will work mostly at site assignments abroad, approximately 250-300 days abroad per year and the home office location is in Portugal or in Spain.

Please note that relocation costs and/or immigration support is not available for this position. We offer you an interesting position in challenging and rewarding projects globally. In this position you have a possibility to work in a successful team with people from many cultural backgrounds.

What You Will Be Doing

Wärtsilä Energy Business is looking for skilled and enthusiastic Mechanical Supervisor / Commissioning Engineer. In this position your main role is to supervise Mechanical installation and / or perform commissioning, performance and handing over activities in power plant projects.

As Mechanical Supervisor / Commissioning Engineer, your work will focus on these responsibilities:

• Supervise the scope of work and follow material flow at site.
• Guide mechanical subcontractor(s) at site.
• Maintain good customer relations and team spirit at site
• Highlight the economical and cost saving working procedures.
• Proactively identify constraints for planned mechanical works and analyse root causes.
• Ensure that mechanical installation schedule, design and instructions are followed.
• Perform start-up and tests of equipment within the scope of the contract.
• Ensure that all test results are documented according to Wärtsilä instructions.
• Resolve and record technical problems during the commissioning.
• Guide operation personnel with plant design and functionalities.
• Assist the client with commissioning procedures and testing.
• Maintain good reporting practices.
• Safeguard the compliance with HSSE policies and minimize the risks during installation and / or commissioning
• Ensure quality documentation, as-build drawings and plant required handing over documentation is updated, submitted and signed.
• Follow commissioning plan and performance tests and procedures, ensuring a safe and reliable function of the plant and equipment.
• Guide operation personnel with plant design and functionalities.

To be successful in this role, we expect you to have:

• B.Sc or M.Sc. in Mechanical Engineering
• Familiar with relevant codes and standards
• Understanding of utility generation construction, and commissioning practices
• Working experience in similar tasks preferred
• Good communication and team building
• Willingness to learn and adapt new technologies
• Good technical background and analytical mind
• Good leadership and organizational skills Mechanical works planning skills
• Ability to adjust to a wide range of conditions and cultural environments
• Willingness to work abroad - activities are performed mostly abroad
• Good command of English, both oral and written
• Other languages are seen as an advantage

This position offers you an opportunity to use and enlarge your expertise in an international and dynamic environment, working on new build power plant works. Projects, production locations, Wärtsilä offices, customers and suppliers can be found all over the world. This position will therefore see you travelling abroad, around the world, approx. 250 days a year.

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 courage to see opportunities and take initiative.

We are authentic and honest, and we strongly believe in 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.

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

Last application date: 16/11/2026

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.