Third Mate

Allseas; San Diego (CA); On-site; USD 110,000 - 150,000; Full time

Benefits offered by this job

5x5 rotation schedule

Career advancement

Global workplace with 40+ nationalites

Robust safety programs and training

Diverse fleet experience

Job summary

Allseas is seeking a Third Mate to support safe navigation and dynamic positioning on offshore vessels. You will report to the Chief Mate and collaborate with a skilled bridge team across international projects.

The role emphasizes authoritative navigational duties, voyage planning, DP operation, and strict adherence to STCW requirements while supporting vessel safety and efficiency.

Qualifications

• Maritime education and STCW compliance with all necessary requirements.
• Preferably first experience on a dredging, pipe laying or construction vessel.
• In possession of COC II/1 and IV/2 for navigational watch with no limitations.
• Good knowledge of MS Office applications.
• Proficient in English (spoken and written).
• Fulfillment of Allseas norms for training and qualification.

Responsibilities

• Act as Bridge Officer of the Watch during sailing, anchoring, port ops and DP mode.
• Operate DP system under supervision following company procedures.
• Prepare voyage plans, monitor weather and update navigational publications.
• Collaborate with survey, tension machine, ROV and other departments.
• Maintain up-to-date personal documentation and safety compliance.

Skills

Bridge watch

DP operation

Voyage planning

English proficiency

MS Office

Seamanship

Safety compliance

Education

Maritime education

STCW training

COC navigation watch

Tools

DP System

Ballast control

Job description

As Third Mate, you are essential to the safe navigation and operational control of our offshore vessels. You’ll work on marine operations worldwide, reporting to the Chief Mate and First Mate, and collaborating with a skilled bridge team and other departments.

Your responsibilities include:

• Acting as Bridge Officer of the Watch during sailing, anchoring, port operations, and DP mode, ensuring all activities comply with the Master’s standing orders, international regulations, and good seamanship.
• Operating the Dynamic Positioning (DP) system under supervision, following company procedures and project requirements.
• Preparing voyage plans, monitoring weather forecasts and navigational warnings, and updating nautical charts and publications according to the latest Notices to Mariners.
• Maintaining close collaboration with survey, tension machine, ROV, and other relevant departments to optimize vessel positioning, pipe pull speeds, and power consumption.
• Ensuring all personal documentation (passport, seaman’s book, medical certificate, COC/COP, and STCW training certificates) is up to date and valid.
• Controlling the ballast system as directed, being aware of vessel stability, and coordinating ship-to-ship logistics in liaison with the Barge Foreman and senior officers.
• Monitoring safety, health, and environmental activities, assisting where necessary, and recording all events and incidents in the vessel’s log.
• Carrying out general marine operations, vessel maintenance, and inspections, including maintenance of firefighting and life‑saving appliances.
• Participating in emergency drills and exercises, and being part of the emergency teams as per the vessel’s Station Bill.
• Maintaining direct communication and coordinating activities with all relevant departments involved in operations, ensuring efficient and safe execution of tasks

What we expect from you

To succeed as Third Mate at Allseas, you should have:

• Maritime education and compliance with all necessery STCW requirements
• Preferrably, a first experience on a dredging, pipe laying or construction vessel
• In possession of COC with competency level II/1 and IV/2 “Officer in charge of a Navigational Watch with no limitations”.
• Good knowledge of MS Office applications.
• Proficient in the English language (spoken and written).
• Fulfilment of all training and qualification requirements in accordance with the applicable Allseas norms.
• Good communication and reporting skills.
• Minimum one-year experience as an Officer of the Watch (not required if internship completed within Allseas and with Master’s recommendation).
• Ability to act as Junior DP operator under supervision.
• Ability to prepare voyage planning, monitor weather, and update navigational publications.
• Familiarity with vessel stability, ballast control, and ship-to-ship logistics.
• Experience in collaborating with survey, tension machine, ROV, and other departments.
• Commitment to maintaining up-to-date personal documentation and compliance with company safety management systems

What we offer

Working at Allseas allows you the chance to work in a dynamic, fast‑paced, entrepreneurial environment, with creative thinking, collaboration, and a down‑to‑earth culture at its core. It means contributing to pioneering projects and working with top‑notch technologies.

Apart from that, you can count on the following:

• Competitive salary based on your offshore industry skills and expertise.
• 5x5 rotation schedule for work‑life balance.
• Career advancement opportunities in a dynamic organization.
• Global workplace with professionals from 40+ nationalities.
• Robust safety programs and continuous training.
• Varied fleet experience for skill diversification and career enrichment.

Stories from colleagues

Read Victor's story

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The variety in knowledge, operational expertise, and people is what I love most about working for this company.

Read Kees' story

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Allseas provides a dynamic workplace with innovative ideas, exciting projects, and rewarding efforts.

Read Victor's story

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The variety in knowledge, operational expertise, and people is what I love most about working for this company.

Read Kees' story

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If you enjoy solving problems and taking responsibility, you will find plenty of opportunities here.

Read Jaenet's story

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Olaf Crebolder, Installation Engineer

Witnessing the successful execution of these projects, knowing that I played a role in their development, is a truly satisfying experience.

Read Olaf's story

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I still love the job every single day—the busy days on board, the fantastic crew, and the freedom to perform my work while constantly seeking improvements.

Read Lili's story

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Justin Sjaak, Senior NDT Engineer

Employees are given the chance to learn, grow, and develop their skills, reflecting the company’s attitude towards hard work and trust.

Read Justin's story

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What’s kept me interested in working for Allseas all these years is being able to work in different environments, departments, and continents.

Read Frans' story

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Within Allseas, the expectations are high, but you are given responsibility right from the beginning.

Read Caspar's story

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Marco Chiozzi, Assistant Project Manager

Being in this team gave me the possibility to widen my knowledge and strengthen my skills.

Read Marco's story

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Helio Bailly Guimaraes, Manager Technical Department

Allseas has a brilliant team of diverse cultures and backgrounds, who share the passion and enthusiasm for the work we do.

Read Helio's story

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Jessica Vleugel, Manager Capital Projects

The independence and responsibility asked of me as a student really suited me and I liked the Allseas culture and way of working.

Read Jessica's story

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Laura de Jong, Coating Engineer and Project Manager River Clean up Project

There is a very open and international vibe in the offshore business and people are always friendly and respectful.

Read Laura's story

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Allseas provides a dynamic workplace with innovative ideas, exciting projects, and rewarding efforts.

Read Victor's story

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The variety in knowledge, operational expertise, and people is what I love most about working for this company.

Read Kees' story

Image

If you enjoy solving problems and taking responsibility, you will find plenty of opportunities here.

Read Jaenet's story

Image

Olaf Crebolder, Installation Engineer

Witnessing the successful execution of these projects, knowing that I played a role in their development, is a truly satisfying experience.

Read Olaf's story

Image

If you enjoy solving problems and taking responsibility, you will find plenty of opportunities here.

Read Jaenet's story

Image

Olaf Crebolder, Installation Engineer

Witnessing the successful execution of these projects, knowing that I played a role in their development, is a truly satisfying experience.

Read Olaf's story

Image