Mechanical Build Engineer in Portsmouth

Who we are: SubSea Craft is a fast growing, privately-funded, UK-based innovative maritime technology company specialising in next-generation, high-performance watercraft and systems. We operate at the intersection of advanced engineering, cutting-edge design, and user-centric innovation, delivering safe, effective, and enabling solutions for both commercial and defence applications.

What we offer:

• Annual Leave – Entitlement to 25 days of annual leave plus bank holidays
• Wellbeing Day – An additional Wellbeing Day each year to focus on personal health and wellbeing.
• Private Healthcare – Access to comprehensive private healthcare coverage to support your physical and mental wellbeing.
• Life Assurance and Critical Illness Cover – Comprehensive protection including Life Assurance (4x salary) and Critical Illness Cover for added financial security.
• Family Leave – Enhanced maternity and paternity pay
• Christmas Leave – A Christmas shutdown is typically observed.
• Professional Development – Commitment to ongoing learning and career growth, supported by training programmes and access to LinkedIn Learning.
• Pension Contribution – pension scheme with the option to contribute via salary sacrifice
• Flexible Working – Opportunities for flexible working arrangements to promote work–life balance.
• Inclusive Culture – A professional environment that values diversity, innovation, and collaboration.

Responsibilities will include:

• Assemble marine sub-systems and support functional testing activities to assist with system validation and sea-readiness.
• Build and test marine propulsion components — including engines, gearboxes, and waterjets — to a high standard, ensuring full readiness for installation.
• Proactively identify, report, and provide input on any defects or issues encountered during vessel construction and system installation.
• Install sub-system components into the vessel in line with marine engineering specifications and design requirements.
• Report defects, material issues, or unclear documentation promptly and through the correct process.
• Accurately interpret and follow detailed work instructions, including those provided via 3D models and digital platforms, in a marine engineering environment.
• Support the full fit-out of vessels, ensuring all equipment and systems are installed accurately, securely, and to specification.
• Rigorously follow safety procedures, work instructions, and project schedules to ensure timely and compliant delivery.
• Consistently produce work to the highest quality standards, with a strong focus on safety, reliability, and marine compliance.
• Attend relevant meetings and offer constructive, experience-based feedback to support continuous improvement and build efficiency.
• Travel to and support off-site marine craft testing, trials, or commissioning activities if required, seeing the craft through to commissioning to ensure a smooth handover and operational readiness.
• Aid the operations team with routine and reactive maintenance tasks and provide hands‑on technical assistance as needed.

Qualifications and Experience:

• City & Guilds or HND qualification in Boat Building or Marine Engineering (desirable).
• Experience working with diesel and petrol engines.
• Experience with hand tools & various light machines.
• Experience in waterjet and gearbox installation and maintenance.
• Computer literate with basic knowledge of Microsoft Office.
• Existing right to live and work in the UK and no known bar to obtaining appropriate UK security clearance as required.

Due to the nature of work undertaken at SubSea Craft, the selected candidate must be capable of meeting the security requirements of the position, which would include as a minimum existing right to live and work in the UK, Baseline Personnel Security Standard (BPSS), with UK National security clearance required for certain roles.

Values: Our people are our greatest asset, we continually strive to provide an excellent working environment to enable our team to do their best work. We have an agile professional workforce: we are founded on the belief that our people are valued and our business is trusted, inclusive and commercially adept.

What we expect from you:

• Teamwork, mutual respect and collaboration
• Initiative and independent working
• Honesty and integrity
• Business and commercial awareness
• Agility, adaptability and continuous development

We are committed to building an inclusive, diverse workplace where everyone can thrive. If you require any support or adjustments to interact with us, please let us know.