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L3Harris is dedicated to recruiting and developing high-performing talent who are passionate about what they do. Our employees are unified in a shared dedication to our customers’ mission and quest for professional growth. L3Harris provides an inclusive, engaging environment designed to empower employees and promote work-life success. Fundamental to our culture is an unwavering focus on values, dedication to our communities, and commitment to excellence in everything we do.

L3Harris is the Trusted Disruptor in defense tech. With customers’ mission-critical needs always in mind, our employees deliver end-to-end technology solutions connecting the space, air, land, sea and cyber domains in the interest of national security.

Job Title – Commissioning Engineering Apprentice
Fixed Term Contract for 4 years.

Job Location – Portchester, UK

Job ID – 33339

About this opportunity and L3Harris UK

Operating at 11 sites in the United Kingdom, L3Harris supports Britain's mission to secure and strengthen the country by delivering sovereign innovation across the space, air, land, sea and cyber domains.

L3Harris in Portchester is part of our Maritime International business - a leading global supplier of integrated marine control systems and simulation products for warships, submarines and high-end commercial marine vessels worldwide. Our Maritime UK business has four UK location and together we are powering the Royal Navy’s adoption of autonomous surface vehicle technology as well as delivering autonomous capability to UK ports, harbours and offshore energy service providers.

Please note this is a 4-year fixed term contract.

Applications will close on 10^th April 2026.
Successful applications will be invited to attend an Assessment Centre on 6^th May 2026.

A day in the life of Commissioning Engineering Apprentice:

As an Apprentice within our Commissioning team, you will support the Commissioning and Maritime Operations departments in bringing cutting-edge vessels to life. On a day-to-day basis, you will assist with the electrical, mechanical, and software commissioning of vessels, ensuring all systems are integrated, tested, and compliant with relevant industry standards. You will take part in sea trials alongside our Maritime Operations team to validate autonomous functionality and confirm all safety systems perform as intended. The role will also involve the ongoing maintenance and support of both company and customer vessels, providing hands-on experience across the full vessel lifecycle in a fast-paced, innovative maritime environment.

Apprenticeship Information

L4 Automation and Controls with South Hampton College Group CEMAST campus in Lee-On-Solent.

A few of our employee benefits are:

• Half day finish on a Friday
• 25 days holiday per year (plus bank holidays), increasing with long service and with the opportunity to buy/sell up to 5 days
• Private medical insurance with optional family cover
• Pension scheme of up to 8% employer contribution
• Life Assurance 4x salary (flexible up to 10x)
• Group income protection
• Flexible opt-in extras such as a health care cash plan, dental insurance, gym membership, critical illness cover, cycle to work scheme, travel insurance and electric car scheme
• Employee Family Assistance Program providing mental health and wellbeing support
• Professional membership reimbursement (discretionary)

What the role will involve

The responsibilities of your role will include the following:

• System Integration: Assist in the assembly and integration of unmanned marine systems, including hardware and software components
• Commissioning and Testing: Conduct initial system checks, perform operational tests, and support the commissioning of autonomous marine vehicles
• Troubleshooting: Identify and resolve technical issues during the commissioning phase, with support from senior engineers
• Documentation: Maintain accurate records of testing procedures, system configurations, and any modifications or adjustments made during the commissioning process
• Quality Assurance: Ensure that all systems meet operational and safety standards before deployment in real-world environments
• Collaboration: Work closely with other departments (MarOps, Program Management, Operations) to ensure seamless integration of systems and resolve any technical challenges
• Continuous Learning: Participate in training programs and workshops to enhance your knowledge of unmanned marine technologies and systems
• Completion of the Automation & Controls Engineering Technician – Level 4 Apprenticeship

What you’ll bring 

The role requires the following experience and skills:

• GCSE Math’s - 9-4
• GCSE English - 9-4
• Level 3 Technical Certificate in an Engineering discipline (A Level in Engineering Subject)
• A problem-solving attitude
• Attention to detail
• Reliability
• Punctuality
• Willingness to learn
• Team Player
• Passion for marine systems
• Good communication

Important to know

Due to the nature of our work many our roles require a UK nationality and the ability to obtain a security clearance. Applicants who accept a conditional offer of employment must meet the requirement of right to work in the UK and must meet eligibility requirements for access to classified information and will be subject to government security checks.

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L3Harris Technologies is proud to be an Equal Opportunity Employer. We are committed to maintaining a workplace that is free from unlawful discrimination and offers equal opportunities for all. Applications from individuals are encouraged regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion or belief, and marriage and civil partnerships.