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Principal Thermal Engineer
Location: Stevenage
Duration: 12 months, with potential extension
Rate: Up to 50 per hour (Umbrella)
Clearance: SC required to start
Working Pattern: Onsite role (minimum 3 days per week, but assume full-time onsite)
We're looking for an experienced Principal Thermal Engineer to join a leading defence engineering team in Stevenage. You'll be part of a well-established Mechanical Analysis Group, working on complex and varied projects that shape the next generation of advanced military systems.
The Role
You'll take technical ownership of thermal analysis activities, supporting projects from early concept stages through to final performance evidence. This includes:
Delivering packages of thermal analysis work with clear conclusions
Using a mix of hand calculations and Finite Element methods (e.g. ANSYS)
Producing thermal studies involving conduction, convection and radiation
Supporting thermal analysis of electronic assemblies and embedded systems
Using MATLAB/Simulink, CFD tools or Python/MATLAB scripting where required
Presenting findings in reports and at design reviews
Working closely with multi-disciplinary teams and project stakeholders
Managing your workload and providing regular progress updates
This position is ideal for someone who combines technical depth with strong communication skills and enjoys collaborating across engineering disciplines.
What We're Looking For
Degree in a STEM discipline (or equivalent experience)
Proven background in thermal analysis
Experience with heat transfer modelling using analytical and FEA methods
One or more of the following is desirable:
Thermal analysis of electronic systems
MATLAB/Simulink thermal modelling
CFD for thermal behaviour
Python/MATLAB scripting
Ability to make quick, practical assessments to support design decisions
Confident communicator able to collaborate with internal and external teams
Experience from defence, aerospace or electronics sectors is beneficial
Why Join?
This is an excellent opportunity to take a key role in a major defence engineering environment, working alongside highly skilled colleagues and contributing to products used globally. The project work is varied, technically challenging and makes a measurable impact.
