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Senior Mechanical Design Engineer

L3 Harris
Brighton, East Sussex
Closing date
4 Mar 2024

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Aviation, Mechanical
Contract Type
Full Time

Job Details

L3Harris is dedicated to recruiting and developing diverse, 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 Technologies is an agile global aerospace and defense technology innovator, delivering end-to-end solutions that meet customers’ mission-critical needs. The company provides advanced defense and commercial technologies across space, air, land, sea and cyber domains. L3Harris has approximately $18 billion in annual revenue and 50,000 employees, with customers in more than 100 countries.


Job Title: Senior Mechanical Design Engineer

Job Location: Brighton and Hove, England, UK

Flexible, condensed or reduced working hours considered and hybrid working where possible.

About L3Harris UK

From 12 UK sites, our team of over 1,400 people deliver unique capabilities across air, land, sea, space and cyber for military, security and commercial customers, worldwide.

L3Harris in Brighton are part of Release Systems and the Mission Avionics sector operating in the Aerospace domain. We specialise in high performance electro-mechanical systems and pneumatic technology for airborne weapon carriage release.

A few of our employee benefits are:

  • Flexible, condensed or reduced working hours considered and hybrid working where possible
  • 12pm finish every 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 7% employer contribution
  • Life Assurance 4x salary (flexible up to 10x)
  • Group income protection
  • Referral bonus scheme
  • Flexible opt-in extras such as a health care cash plan, dental insurance, gym membership, critical illness cover and cycle to work scheme
  • Employee assistance program providing mental health and wellbeing support
  • Professional registration with the IET (if applicable)

What the role will involve

The responsibilities of the Senior Mechanical Engineer will include the following: 

  • Responsible for the design, layout, testing and evaluation of mechanical and electro-mechanical devices or systems.
  • Development of complex innovative, well engineered conceptual solutions and design proposals, and guide other engineers, designers to produce detailed CAD design layouts and manufacturing drawings. 
  • Prepares design specifications, analysis and recommendations for presentation and approval.
  • Analyzes mechanical requirements to determine feasibility of design within time and cost constraints.
  • Lead fellow team members to improve efficiency and accuracy.
  • Support Investigations, solutions and write reports
  • Be prepared to assist with other engineering duties (e.g. testing, experimentation, modelling, CAD design etc) as work-load may demand from time to time
  • Provides technical guidance and engineering leadership to projects and team members through mentoring and training of others in team or department.
  • Understand the requirements presented in Requests for Quotation – Specifications, System Requirements Documents.

What you’ll bring

The role of Senior Mechanical Engineer requires the following experience and skills:



  • 10 -15 years mechanical and design engineering experience.
  • Proven full product life cycle design.


  • Aerospace and Defence Engineering experience.
  • High pressure pneumatics 
  • Electrical/Electronic knowledge, including electrical cabling in extreme environments (aerospace) and electronics packaging.

Skills/ knowledge:

  • Systems Engineering requirements understanding.
  • Geometric Tolerancing, Stack-Up Analysis, BS8888
  • 3D CAD, ideally Solid Works and SolidWorks PDM.
  • Good understanding of Design Office practices, Drawing Issue and Change processes
  • Technical Report / Procedure writing.
  • Ability to resolve challenges quickly and ingeniously
  • Design products with low costs from the outset (DFMA & Design to Cost methodologies)
  • Perform work accurately with minimal supervision;
  • Mechanical Engineering Calculations, Stress Analysis, Fluid Dynamics (FEA and CFD).

Education/ qualifications:

  • BEng, BSc, MSc, MEng in Mechanical / Aerospace Engineering or similar subject/qualification.
  • Professional Membership – Member of IMechE or IET or working towards Chartered membership (preferred).

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.

As an equal opportunities employer, L3Harris is committed to the equal treatment of all current and prospective employees and does not condone discrimination on the basis of age, disability, sex, sexual orientation, pregnancy and maternity, race or ethnicity, religion or belief, gender identity, or marriage and civil partnership.


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Learn more about this company

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