Assistant Mate (m/w/d)
Heerema Marine Contractors
Company Overview
Heerema Marine Contractors
Leiden, Netherlands
1948
Approximately 2,000 employees worldwide (source: heerema.com).
What They Do
Heerema Marine Contractors specializes in maritime contracts for offshore oil and gas infrastructure. Their core technologies focus on heavy-lift semi-submersible crane vessels (SSCVs) such as Thialf, Hermod, and Sleipnir, designed for complex installations in water depths of up to 3,000 meters (source: heerema.com). Their services include engineering, procurement, installation, construction (EPIC), transportation, decommissioning, and project management for both fixed and floating structures worldwide. This makes them a key player in the oil and gas industry, particularly in challenging environments like the North Sea (source: noia.org). With over 60 years of experience in innovative heavy-lift solutions, they are capable of executing projects that others cannot handle (source: heerema.com). Their focus is increasingly on the decommissioning of aging installations, representing a growing market (source: heerema.com).
Projects & Track Record
Heerema has an impressive track record of completed projects, including early installations in Lake Maracaibo and multiple platforms in the North Sea through turnkey EPIC contracts on the Dutch continental shelf (source: heerema.com). Since the 1990s, they have executed deepwater field developments with their SSCVs Balder, Hermod, and Thialf, installing jackets and modules in water depths of up to 3,000 meters. These installations are now often focused on decommissioning by Heerema itself (source: heerema.com). Their recent projects utilize the full fleet for transportation, installation, and removal of offshore facilities worldwide, although specific details about post-2019 projects have not been documented (source: noia.org). Key clients include oil and gas companies in regions such as the North Sea, Gulf of Mexico, and Angola to Australia (source: heerema.com).
Recent Developments
In the past two years, there have been no major announcements, contracts, acquisitions, or mergers documented in the available sources, except for the launch of Sleipnir in 2019 (source: heerema.com). The company continues to operate with its fleet for offshore projects amid shifts in the industry towards decommissioning (source: heerema.com).
Working At
Heerema offers a wide range of positions in engineering, project management, construction, logistics, planning, manufacturing, marine operations, and decommissioning (source: noia.org). Recruitment locations include the headquarters in Leiden, the manufacturing yard in Vlissingen, and international offices in Houston, Texas; Port Fourchon, Louisiana; Angola; Australia; Brazil; Mexico; Malaysia; Singapore; and the United Kingdom (source: heerema.com). The company culture emphasizes a 'Dare to Care' safety program that prioritizes an incident- and injury-free workplace, as well as social responsibility and high-quality standards (source: heerema.com). While specific benefits are not detailed in public documents, the emphasis is on team well-being and a safer workplace through proactive feedback and action (source: heerema.com).
Contact
Last updated on 2025-12-27 | Report an issue
Job Description
Imagine starting your nautical career on one of the world's largest crane vessels!
At Heerema Marine Contractors, we do something new every day. We operate the world's largest crane vessels and with them we transport, install and remove offshore structures for the offshore energy markets. Our projects range from installing wind turbines, removing retired offshore oil and gas platforms and installing platforms up to 50,000 metric tons. By joining us, you will play an important part in our unique maritime adventure.
Your role in the story
As an Assistant Mate you start aboard one of our crane vessels and will be eventually responsible for watch keeping and navigating in accordance with "Captain's orders" and international laws and regulations. You will learn how to operate the DP system and contribute to safety activities. Furthermore you will make yourself familiar with procedures regarding the projects, heavy lifting and ISM. And also will track and update sea charts, check instruments, keep the logbook, monitor weather forecast and take timely action when necessary. As a last you are aware of the positioning of the ship, perform tasks when the ship is anchored, maintain radio contact and keep an eye on all occurring movements.
Key ingredients for success
You have recently obtained your Bachelor degree at the Higher Maritime School, hold a license to work as an Assistant Mate and are preferably DPO certified or willing to certify. Excellent reporting skills, a practical mind and flexible attitude. The ability to communicate in a strong and clear manner, both in Dutch and English, is essential.
Your future colleagues
In this position you will work closely with our experienced and professional Mates, Assistant Chief Mate, Chief Mate and Captain who will guide you in your development.
Your Foundation for Success
At our core, we champion an entrepreneurial spirit and a relentless pursuit of growth. We seek individuals who excel in personal development, seize opportunities where others see challenges, and turn them into success. Whether you're a creative problem-solver, an ambitious go-getter, or someone who thrives in collaboration, we cultivate a culture of passion, dedication, and continuous improvement. Personal leadership and initiative are non-negotiable: you own your growth and the impact you make. If you tackle challenges with a creative yet practical mindset, drive goals with determination, and add value to diverse teams, you'll thrive with us. Together, we create impact and drive meaningful change, always focused on results.
Here's why people love working with us
- Strong compensation & benefits, including offshore allowance, bonus structure, and strong pension and insurance packages
- bonus basis = your annual gross salary + 13th month + 8% holiday allowance;
- Future-proof pension: gross scheme covering base + 13th month + holiday allowance, with no mandatory contribution up to ???70,719.48.
- Comfortable cabins, fitness facilities, excellent catering, and onboard recreation
- A high focus on safety and sustainability
- 5 weeks on / 5 weeks off rotation schedule (subject to project needs)
Is this your dream job? Put in your application now!
The application process consists of two interviews, an online assessment, and an employment offer.
- The first interview will be conducted via Microsoft Teams with the Captain and Recruiter, giving you the opportunity to learn more about the nautical aspects of the role and life on board our vessels.
- The second interview will take place at our office in Leiden, where you'll meet additional team members and get a better feel for our culture and working environment.
As part of the process, you will also complete an online assessment, which will take place either before or immediately after the first interview. We are excited to learn more about your ambitions, personality, and motivation. Include a short cover letter telling us why you're the perfect fit, and make the impossible possible with Heerema!
Are you ready to make the impossible possible offshore?
At Heerema Marine Contractors, we deliver the world's most challenging offshore projects in the energy sector. From designing and engineering to transporting, installing, and removing offshore structures, we make the impossible possible - safely and sustainably.
Our success is built on the expertise and dedication of our diverse team, working together across offshore, onshore, and office-based roles. We value teamwork, innovation, and a can-do mindset, and we are proud of our culture where colleagues support and inspire each other to achieve excellence.
Join Heerema and become part of a world-class team shaping the future of the offshore industry.
Highlights
At Heerema Marine Contractors, we offer offshore jobs, engineering careers, and office opportunities worldwide. Join our team and make the impossible possible.
Job Location: HMC Leiden
Base Salary: 67,476.00 EUR
Business area: Offshore Marine Crew
Standard Weekly Hours: 84.00
Job Level: Entry/Junior
Req Id: 665
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About the role
December 15, 2025
Full Time
Company
January 2, 2026
On-site
EUR 67k yearly
- Leiden, the Netherlands
Entry/Junior
UTC+01:00
Apply now
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