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Principal Systems Engineer - 15% Sign on Bonus

Tewkesbury, United Kingdom; Fleet, United Kingdom

Job ID SAS20232908-105306
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Our team in the UK has an unwavering focus on our commitment to excellence in everything we do, delivering mission solutions with speed, innovation and flawless execution.

  • Full Time
  • Level: Experienced
  • Location: On Site
  • Glassdoor Reviews and Company Rating

Success Profile

What makes a successful team member at L3Harris?
Check out the traits we’re looking for and see if you have the right mix.

  • Collaborative
  • Detail-Oriented
  • Influential
  • Organised
  • Strategic
  • Technical


A dynamic market environment combined with pioneering technology and a collaborative team, makes every day interesting and engaging.

Thomas, Program Finance Manager, Crawley, UK

L3Harris Work Perks

  • Health

    • Private medical insurance and group life assurance
    • Benefit allowance to help you pay for insurance
    • Options for dental and critical illness coverage as well as a health cash plan and gym membership

  • Family

    • Employee and Family discount programme
    • Employee Assistance Programme
    • Optional partner life assurance

  • Well-Being

    • Generous annual holiday allowance
    • Retirement savings plan with employer contribution
    • Employee assistance programme to provide advice and guidance on finance, mental health, and more
    • Casual “dress for your day” policy

Job Description

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 – Principal Systems Engineer - 15% Sign on Bonus

Job Location – Tewkesbury OR Fleet, UK

Flexible, condensed or reduced working hours available, i.e. 4-day condensed working week, 9-day fortnights,12pm finish every Friday, etc.

Job ID – SAS20232908-105306

About this opportunity and L3Harris UK

L3Harris in Tewkesbury and Fleet are part of our ICI division, we work closely with UK Government and Security Agencies primarily in the areas of Crypto/Cyber Security and Electronic Warfare including Counter IED capability.

We are looking for a Principal Systems Engineer to join our Engineering team working on a variety of Cyber Security or Electronic Warfare projects. Reporting to the overall Systems Engineering Manager, you will take a leading role in the Systems Engineering activities for systems or sub-systems on engineering development programmes, whilst also line managing a group of experienced engineers.

A few of our employee benefits are:

  • 15% sign on bonus
  • £3,000 to £6,000 DV Bonus – please note this level of clearance isn’t essential for this role. This bonus is subject to individual clearance and project requirements – discussed upon application.
  • Flexible, condensed or reduced working hours available, i.e. 4-day condensed working week, 9-day fortnights,12pm finish every Friday, etc.
  • 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
  • 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 (Engineers only)

What the role will involve

If you join our team of dedicated experts, the responsibilities of your role will include the following:

  • Taking a leading role in the development of complex Cyber Encryption or Electronic Warfare Systems and in some cases acting as the Technical Authority or Systems Architect for a sub-system.
  • Provide technical leadership to engineering teams and the opportunity to influence the wider business to improve the way Systems Engineering is executed
  • Contribute to the development of the Systems Engineering Function through the promotion of Systems Engineering best practice, tools, processes and training
  • Contribute to the generation of technical proposals, bids and presentations
  • Drive the test and qualification strategy for solutions and sub-systems
  • Opportunities to participate in trials, customer demonstrations and onsite acceptance testing in a range of countries worldwide

What you’ll bring

  • Experience of taking a leading role in engineering development projects through most parts of the systems lifecycle from concept definition through to handover to the customer
  • Experience of requirements capture, decomposition and establishing verification strategies for embedded systems
  • Experience of Model based systems engineering using SysML
  • Experience of working closely with low level design teams in electronic design, mechanical design and software
  • Ability to develop Verification strategies for complex embedded systems
  • Skilled at using DOORS or other similar Requirements Management Tools
  • Good understanding of Project Management and Engineering Management through producing realistic estimates, managing risk and monitoring progress to meet tight timescales

Important to know

Many of our roles require the ability to obtain a security clearance relevant to the country of the position. In addition, applicants who accept a conditional offer of employment must meet eligibility requirements for access to classified information and may be subject to government security checks.

L3Harris Technologies is proud to be an Affirmative Action/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.





Thank you for your patience as we transition to a new applicant tracking system. Please be aware that you may have applications in more than one system at this time and, as a result, you may receive communications regarding your applications from multiple systems.

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