HVAC Design Engineer - Offshore Substations

Esbjerg, Nordhavn

Are you a Mechanical Engineer with HVAC design experience and a passion for creating robust technical solutions? Do you want to design HVAC systems for offshore substations supporting some of the world's largest renewable energy projects? Then this could be your next opportunity.

Your Position

We are looking for a highly skilled and motivated Mechanical Engineer with experience in HVAC system design to strengthen our HVAC team.

In your new position as HVAC Engineer in the Renewables division, you will join our experienced Mechanical & HVAC team. You will design and engineer HVAC systems for offshore substations and work closely with multidisciplinary engineering teams, clients, suppliers, procurement, fabrication yards and commissioning teams.

You will contribute throughout the project lifecycle, from concept and tender work through detailed design, procurement, construction support and commissioning. Your work will help create robust, safe and efficient HVAC solutions for complex offshore installations.

At Semco Maritime safety is a core value, and in this role, you will contribute to maintaining and promoting a strong safety culture while delivering innovative solutions. Above all, your work will make a real change for the global energy sector.

Your place of work will be either Esbjerg, Nordhavn or Gdynia. The position is full-time, and you can expect approximately 30 travel days per year.

Your tasks & responsibilities

In this role, you will primarily work on EPCI (Engineering, Procurement, Construction and Installation) contracts for offshore substation projects.

Typical responsibilities include developing HVAC design solutions and technical documentation for offshore substation projects.

Your tasks will include but are not limited to:

  • Design, Engineering & System Integration: Designing ventilation, cooling, heating and pressurization systems, including calculations and equipment sizing.
  • Developing HVAC philosophies, specifications, diagrams, technical requisitions and other project documentation.
  • Compliance, HSE & Quality Assurance: Ensure full compliance with applicable standards, codes, and regulatory requirements, while supporting and adhering to health, safety, and environmental standards in all activities throughout the project lifecycle.
  • Specifying HVAC equipment and supporting procurement, bid evaluation, vendor follow-up and document review.
  • Coordinating technical interfaces with electrical, structural, piping, fire protection and control system disciplines, and participating in client meetings and design reviews.
  • Supporting fabrication, testing and commissioning activities, including FATs, SATs and site support when required, while adhering to health, safety and environmental standards.

Your profile & qualifications

We are looking for a structured and solution-oriented Mechanical Engineer who is passionate about HVAC design and wants to make a personal contribution to offshore renewable energy projects. You collaborate effectively across disciplines, communicate clearly and take ownership of your engineering deliverables.

We are looking for an outgoing and positive professional who is passionate about renewable energy and wants to leave their personal mark on it. You have a proactive and organised approach to your work and are eager to help innovate the future of sustainable solutions

To succeed in this position, we imagine that you have:

  • A Bachelor's or Master's degree in Mechanical Engineering, Marine Engineering or another relevant engineering discipline.
  • Experience with HVAC engineering and design, preferably from industrial, marine, energy or offshore projects.
  • Knowledge of ventilation, cooling, refrigeration, heating and pressurization systems, including DX and water-based cooling solutions.
  • Experience with technical documentation, equipment specifications and coordination in multidisciplinary EPC projects; offshore substation, offshore wind, marine or industrial plant experience is considered a strong advantage.
  • Professional English communication skills and a strong commitment to teamwork, quality and safety.
  • A strong focus on quality and safety, demonstrated through attention to detail and adherence to HSE requirements.

Contact data:

Rafid Sarkes Pols Kajo
Manager, Mechanical

Deadline: 25/09/2026

Ansættelsestype: Employment type: Permanent

Hjemmearbejde: Remote work: Not disclosed

Ugentlig arbejdstid: Weekly working time: Full-time

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We offer you more than a workplace

We offer you the chance to change what really matters. To deliver intelligent and hands-on answers to global questions together with the most dedicated thinkers and doers in the energy industry.

At land and at sea – where we care for and trust each other. And where your dedication will impact our projects, partnerships, and people. 

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The best thing about working here is that I still after many years in the company feel that my job is evolving – it never gets boring.

Play your role in the global energy sector. With us.

Looking for a workplace where you can make real change? A meaningful job where you have the freedom, trust, and responsibilities to play an important role and not just be a small fish in a big shoal?

Well, at Semco Maritime, we wear many hats (and helmets), covering all kinds of aspects and phases of innovative offshore energy projects around the world. Both within the conventional energy sector and the renewable energy industry — and within various professional disciplines such as project management, engineering, design, fabrication, installation, service, and maintenance of offshore assets.


Change. With us.

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Step into the change

We want to be the partner that shapes the energy transition — not just follows it. We challenge the status quo and put our hearts and minds into how a fossil-free future actually gets built. Together with world-leading partners, at sea and on land.

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Join a culture of curiosity

With more than 40 years of experience, we never stop being curious. We stay open to new thinking and especially value input from the people closest to the work. You'll find room to take initiative, share ideas and shape how we work.

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Grow your expertise

This is a place where you develop — professionally and personally. Our specialists are true experts in their fields, and you'll be surrounded by people who lift each other and help you become even better at what you do.

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Your well-being is our success

We put people first — our colleagues and our partners. Safety, trust and a healthy balance between structure and freedom are at the core of how we work, so you can feel safe, heard and like an important part of the team.

Come on board!

Our goal is to make you a success in your new job. Below, you can see our recruitment process from when you apply, to the evaluation

Our recruitment process:

Apply for a vacant position:

If you are interested in one of our job openings, please apply online as we only accept electronic applications. You will receive a confirmation e-mail within 24 hours. We screen all our applications continually during the application period. In order to find the right match we look at competences, experience and education.

Unsolicited applications:

you can also submit an unsolicited application online. Your application will be filed in our job database - and every time we have a job opening we check this database to see if we have a match.

The purpose of the first interview is to get an impression of the person behind the application and to clarify expectations. You will get the opportunity to explain your motivation in applying for the job and we will introduce you to our company, departments and values.

If you have given us your consent, we will also follow up on your references at this point.

Based on the information provided in your application and interview, we will make use of various profile tools in the second interview. For some positions we also use cases to get an impression of the candidate’s analytical and problem-solving abilities.

We will go into your professional qualifications and personal competences in depth using two tools: A personality profile analysis (PPA), and a General Intelligence Test (GIA). We will provide feedback on your profile and/or the result of your tests and on how well the results match the job at hand.

After the second interview, we will evaluate and make a decision based on the two interviews.

If everything goes according to plan - and you get the job, you will begin a on-boarding process which will make sure that you become successfully integrated in the Semco-organisation.

WELCOME to our team!

Whether you are a recent graduate or an experienced professional

...we offer you ample room to grow.

As a leading company with a global presence, we provide numerous opportunities for advancement, allowing you to transform your initial position into your next.

And the next. And the ...

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It is a strange feeling to be the NEW guy - but my colleagues in the HSEQ department have all been very welcoming – and they seem to value my background and experience.

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