Mechanical Engineer (Offshore Substations)

Semco Maritime; Gdynia; On-site; PLN 180,000 - 280,000; Full time

Job summary

Semco Maritime is seeking a Mechanical Engineer for the Renewables Division, based in Gdynia, Poland. You will own the mechanical package from concept to commissioning for offshore substation platforms and contribute to safe, reliable operations in demanding offshore environments.

You will work on EPC/EPCI contracts, focusing on emergency/backup diesel generators and fuel systems, while upholding safety culture and driving innovative solutions across large-scale offshore projects.

Qualifications

• Bachelor’s or Master’s in Mechanical Engineering or Marine Engineering.
• Experience with EPC/EPCI project execution in large-scale settings.
• Experience with diesel generator systems and offshore projects.
• Familiarity with DNV, IEC, and ISO standards.
• Strong written and spoken English; cross-functional teamwork.

Responsibilities

• Design, engineering & system integration of mechanical packages for offshore substations.
• Ensure compliance with HSE, quality, and regulatory standards across the project lifecycle.
• Prepare specifications, drawings, documentation, and procurement packages; sign FAT/SAT.
• Manage costs, hours, and quality for the mechanical scope within projects.
• Coordinate with clients, suppliers and internal teams; support tenders and engineering standards.

Skills

Mechanical Engineering

EPCI experience

Diesel generators

Offshore projects

English communication

Education

Bachelor’s or Master’s in Mechanical Engineering / Marine Engineering

Job description

Join our team and help shape the future of renewable energy.
Are you an experienced and result-driven Mechanical Engineer ready to start a new chapter? Do you want to write history and take part in the green energy transition? Here is a unique opportunity for you!
Mechanical Engineer – Renewables Division, Mechanical Team
In your new position as Mechanical Engineer in the Renewables Division, you will be a valuable member of the dedicated Mechanical Team whose mission is to contribute to the design and delivery of mechanical systems for offshore substations. You will have the chance to contribute to the design and delivery of mechanical systems for offshore substations, ensuring safe, efficient, and reliable operation in demanding offshore environments.
You’ll own the mechanical package from concept to commissioning for offshore substation platforms
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 Kielecka 2 Street in Gdynia, Poland. The position is full-time, and you can expect to travel 30 days per year.
This is your chance to work on some of the largest offshore substation projects worldwide and contribute to innovative solutions driving the global energy transition.
Hiring Manager, Rafid Kajo
Your Tasks & Responsibilities
In this role, you will primarily work on EPCI (Engineering, Procurement, Construction and Installation) contracts for offshore substation projects. As a mechanical engineer, your responsibilities include designing mechanical systems, with a primary focus on emergency/backup power diesel generators and fuel systems for offshore substations.
Your Tasks Will Include But Are Not Limited To

• Design, Engineering & System Integration: Develop mechanical designs and engineering deliverables in collaboration with interdisciplinary teams, ensuring seamless integration with electrical, structural, and control systems.
• 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.
• Documentation, Procurement & Testing: Prepare and manage specifications, drawings, technical documentation, and procurement packages; oversee and sign off FAT (Factory Acceptance Tests) and SAT (Site Acceptance Tests).
• Cost, Hours & Execution Control: Manage cost, hours, and quality for the mechanical scope within assigned projects, ensuring efficient and reliable execution.
• Stakeholder Coordination & Continuous Improvement: Coordinate with clients, suppliers, and internal stakeholders; support tenders, troubleshooting, and technical clarifications; facilitate workshops and contribute to concept optimisation, lessons learned, and engineering standards development.
  

Your Profile & Qualifications

• A Bachelor’s or Master’s degree in Mechanical Engineering, Marine Engineering, or a similar relevant discipline.
• Experience from EPC/EPCI project execution, preferably in complex or large-scale engineering projects.
• Experience with diesel generator systems and/or offshore projects, ideally within energy or marine environments.
• Familiarity with industry standards such as DNV, IEC, and ISO.
• Professional communication skills in English, both verbal and written.
• Ability to communicate clearly and work effectively in cross-functional and multidisciplinary teams.
• A strong focus on quality and safety, demonstrated through attention to detail and adherence to HSE requirements.
• Readiness to work from the office in Gdynia.
• Proactive and organised approach.
  

Welcome to Semco Maritime
At Semco Maritime, we create change. For people. For projects. And for the global energy sector. With us, you will join a community of over 2,300 of the most dedicated thinkers and doers in the energy industry who are driving real change and making their own personal mark on the global energy landscape.
While everyone knows why the energy transition is vital, we are concerned with the journey. How to get there. By providing the answers needed to make change real. Because we believe that global energy ambitions can only be realized through hard work and clever pragmatic solutions. This is what we do. This is what we invite you to participate in.
Safety is at the core of everything we do, and we are committed to protecting our people, partners, and the planet as we work towards a sustainable energy future.
So yes, working for us will change the energy sector – and may well change you too.
Care to join the movement?
Change. With us.