Job Title:
Principal Mechanical Design Engineer
Location:
Barrow-in-Furness. We offer a range of hybrid and flexible working arrangements – please
speak
to your recruiter about the options for this role
Salary:
Circa £55,000
What you’ll be doing:
Lead
the end-to-end development of
complex
fluid systems, shaping designs that meet demanding performance and environmental requirements
Create and review high-value engineering deliverables – for schematics and P&IDs to calculations, system descriptions, and 3D models
Drive advanced system
analyses, including flow, pressure, thermal, and transient modelling to validate performance under
challenging
conditions
Select and assess critical equipment (pumps, compressors, valves, heat exchangers, filters, tanks), ensuring it meet tough submarine operating environments
Champion
technology integrity by reviewing supplier documentation, ensuring full compliance with shock, vibration, atmosphere, temperature, maintainability, and access constraints
Influence design quality and safety, contributing to reviews, hazard studies, verification activities, and resolution of technical issues, modifications, and non-conformances
Your skills and experiences:
Essential:
Educated to degree level, with Chartered Engineer status highly desirable
Solid background in mechanical, marine, process, or fluid systems engineering gained with a
complex
or highly regulated environment
Strong
knowledge of fluid dynamics, thermodynamics, pressure-drop behaviour, transient
analysis, and system performance modelling
Demonstrated technical
expertise
in the design,
analysis, and integration of both compressible and incompressible fluid systems
Desirable:
Experience using industry-standard modelling and
analysis
tools such as FloMASTER, FluidFlow, MATLAB, CFD packages, ANSYS, or similar
Benefits:
As well as a
competitive
pension scheme, BAE Systems also offers employee share plans, an extensive range of flexible discounted health, wellbeing and lifestyle benefits, including a green car scheme, private health plans and shopping discounts – you may also be eligible for an annual incentive.
The Mechanical Engineering Discipline team:
This is an exciting opportunity to join the SSN AUKUS Platform Mechanical Integrated Delivery Team as a Principal Mechanical Design Engineer, where you’ll serve as a technical specialist for some of the submarine’s most critical compressible and incompressible fluid systems. In this role, you’ll take
ownership
of high-integrity mechanical designs that
must
perform flawlessly within one of the most demanding engineering environments in the world. You’ll shape
complex
system solutions, influence platform-level
decisions, and ensure designs meet the rigorous performance, safety, and environmental requirements unique to submarine engineering. This a chance to work at the forefront of next-generation naval capability, tackling
challenging
technical problems and contributing directly to one of the UK’s most advanced defence programmes. We offer relocation support across all Submarine roles, subject to meeting eligibility criteria
Why BAE Systems?
This is a place where you’ll be able to make a real difference. You’ll be part of an inclusive culture that values diversity of thought, rewards integrity, and merit, and where you’ll be empowered to fulfil your potential. We welcome people from all backgrounds and want to make sure that our recruitment processes are as inclusive as possible. If you have a disability or health condition (for example dyslexia, autism, an anxiety disorder
etc .) that may affect your performance in certain assessment types, please
speak
to your recruiter about potential reasonable adjustments.
Please be aware that many roles at BAE Systems are subject to both security and export
control
restrictions. These restrictions mean that factors such as your nationality, any nationalities you may have previously held, and your place of birth can restrict
the roles
you are eligible to perform within the organisation. All
applicants
must
as a minimum achieve Baseline Personnel Security Standard. Many roles also require higher levels of National Security Vetting where
applicants
must
typically have 5 to 10 years of continuous residency in the UK depending on the vetting level required for
the role, to allow for meaningful security vetting checks.
Closing Date:
19th December 2025
We reserve the right to close this vacancy early if we receive sufficient applications for
the role. Therefore, if you are interested, please submit your application as early as possible.
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