Senior Mechanical Engineer

Job Title – Senior Mechanical Engineer

Job Location – Brighton, UK

Our Brighton business is moving to a new location in 2027. The new site is expected to be within a 15-minute drive of our current site.

Job ID – 39446

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 Brighton are part of our Release Systems & Antennas division operating in the Aerospace domain. For over 70 years, L3Harris has designed and developed industry-leading carriage and release systems for fighter, rotary-wing and unmanned platforms and we design, manufacture and test a large portion of our release systems portfolio in our Brighton facility which offers 48,500 square feet of manufacturing space. Our mission-critical release systems equipment is on most major airborne fighter platforms worldwide, including the F-35, along with other aircraft like the Gripen and Typhoon.

Please note, our Brighton business is moving to a new location in 2027. The new site is expected to be within a 15-minute drive of our current site.

A few of our employee benefits are:

• Hybrid working where possible, three days onsite per week post passing probationary period.


• 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:

• Provide technical design input to mechanical architectures, interfaces and key design features.


• Lead assigned work packages and, where appropriate, an engineering programme (Project Engineering Lead), with accountability for technical scope, delivery, risk and engineering outcomes Contribute to design trade studies, concept evaluation and selection of technically robust solutions.


• Coordinate engineering activities across disciplines in support of work package or programme objectives, without line management responsibility.


• Guide design intent and ensure alignment with requirements, environmental constraints and lifecycle considerations.


• Review, approve and technically assure mechanical design outputs including drawings, analyses, specifications and substantiation evidence.


• Assess design feasibility against cost, schedule, manufacturability, maintainability and lifecycle constraints.


• Address complex technical issues escalated from project teams, manufacturing or suppliers.


• Interface with customers and suppliers to clarify technical requirements and communicate agreed engineering approaches.


• Provide technical input to cost and schedule estimates in support of programme activities.


• Ensure compliance with applicable standards including BS8888, ISO 1101 and internal engineering governance requirements.

What you’ll bring

The role requires the following experience and skills:

• BEng, BSc in Mechanical / Aerospace Engineering with minimum 6 years of relevant experience, or MEng, MSc with 4 years minimum experience or lieu of degree HNC or HND with 10 years experience


• Strong successful experience in delivery of engineering programmes/tasks


• Experience in requirements engineering including interpreting and managing mechanical requirements and specifications throughout lifecycle.


• Understanding and implications of risk management associated to tasks within allocated programmes/deliverables.


• Ability to work independently, manage competing priorities with project management and be accountable for technical decision whilst under governance oversight.


• Prior hands-on experience with 3D CAD tools and PDM, ensuring configuration control.


• Familiarity with MRP and manufacturing engineering.


• Experience in supporting technical reviews, work planning and schedules.

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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