Mechanical Assembler

Wärtsilä is a world leader in marine technology and leading the industry's transformation towards a decarbonised and sustainable future. With the world’s widest portfolio and service network, we – Wärtsilians - deliver efficient, safe and sustainable integrated products and solutions to enhance the business of our customers. The opportunities presented through digitalisation and new technologies are offering a new era of shipping. Did you know that shipping is the world’s most efficient mode of transportation and that 88% of the world's trade is carried by sea?

We want to change the course towards an interconnected and cleaner maritime future and are constantly on the lookout for future-oriented talent to join our team and to work towards enabling sustainable societies through innovation in technology and services - together. Are you ready to jump onboard?

We are now looking for a

Mechanical Assembler

to join our team working for a better future.

The position is permanent, and the preferred location is in Havant.

This role requires sufficient SC clearance or ability to obtain sufficient SC clearance.

What you will be doing

General job description

As Mechanical Assembler, you will play a key role in carrying out mechanical assembly and testing of precision-engineered components and systems, ensuring compliance with technical specifications, quality standards, and safety regulations.

As Mechanical Assembler, your work will focus on these responsibilities:

• Assemble mechanical components and systems according to engineering drawings, work instructions, and specifications.


• Perform functional and pressure testing of assembled units using appropriate tools and equipment.


• Identify and report any non-conformances or defects during assembly or testing.


• Maintain accurate records of build and test results, including traceability documentation.


• Collaborate with engineering and quality teams to resolve technical issues.


• Ensure all work is carried out in accordance with health and safety procedures.


• Support continuous improvement initiatives within the cell and wider production environment.


• Maintain a clean and organized work area.

To be successful in this role, we expect you to have:

• Proven experience in mechanical assembly and testing, ideally within a defence, marine, or heavy engineering environment.


• Ability to read and interpret technical drawings and method sheets.


• Familiarity with precision measuring instruments (e.g., micrometers, calipers, gauges).


• Experience with hydraulic or pneumatic systems is desirable.


• Strong attention to detail and commitment to quality.


• Good communication and teamwork skills.


• Basic computer literacy for documentation and reporting.

Qualifications:

• NVQ Level 3 or equivalent in Mechanical Engineering or related discipline.


• Apprenticeship in mechanical fitting or similar is advantageous.


• Additional certifications in pressure testing or lifting operations (e.g., LOLER) are a plus.


• Working Conditions


• Workshop-based role with occasional lifting and manual handling.


• PPE must be worn at all times.


• May require occasional overtime or shift work depending on project demands.

Why you and us?

We at Wärtsilä believe in empowerment, ownership and taking responsibility of our work. We support each other’s growth and co-creation is the true basis of our innovation. We have courage to see opportunities and take initiative.

We are authentic and honest, and we strongly believe in that by being your own true self you can accomplish so much more. We don’t always get it right the first time, and if mistakes are made, we make sure to learn and grow from them. We want everyone to voice their opinions freely. That is why we have built an environment that empowers you and everyone around you, and where you can feel safe and cared for. Are you eager to be part of this ambition?

We have an amazing team and we are excited about our work and the impact it has on building sustainable societies. We are looking to find a colleague with this shared passion for smart technologies and a sustainable future.

Contact & next steps

We hope to hear from you soon, by submitting your application through our career’s portal. We aim to keep you updated on the process throughout.

For further questions please reach out to Jess Baxter through [email protected] with any questions related to this position (only for questions from direct job applicants, applications through email will not be recorded or responded to).

Welcome to join us in shaping the decarbonisation of marine and energy!

Last application date: 24.06.2026

At Wärtsilä we value, respect and embrace all our differences, and are committed to diversity, inclusion and equal employment opportunities; everyone can be their true self and succeed based on their job-relevant merits and abilities.

Please note that according to Wärtsilä policy, voluntary consent for a security check may be required from candidates being considered for this position, depending on the applicable country. 

This is Wärtsilä 

Wärtsilä is a global leader in innovative technologies and lifecycle solutions for the marine and energy markets. Our team of 18,300 professionals, in more than 230 locations in 77 countries, shape the decarbonisation transformation of our industries across the globe. Read more on www.wartsila.com.