Job Description

Mechanical Design Engineer

Location: Letchworth Garden City, Hertfordshire (hybrid/flexible considered)

We’re partnering with a UK-based defence and aerospace power-electronics specialist that designs and manufactures mission-critical power systems used in some of the most demanding environments worldwide.

They’re now looking to add a Mechanical Design Engineer to their engineering team — someone who enjoys designing ruggedised, high-reliability mechanical solutions and wants to see their work deployed in real defence and aerospace programmes.

What you’ll be doing

• Designing rugged enclosures, housings, and mechanical assemblies for power electronics used in harsh environments
• Producing 3D models and detailed manufacturing drawings (SolidWorks) from concept through to release
• Engineering designs to meet shock, vibration, ingress protection, and environmental standards (MIL-STD / DEF-STAN / IP)
• Supporting thermal management and structural integrity, ensuring designs perform under extreme operating conditions
• Working hands-on with prototypes, building support, and environmental/EMC testing
• Creating clear technical documentation, BOMs, and compliance evidence for defence programmes
• Collaborating closely with electrical engineers, project managers, and suppliers to ensure designs are manufacturable, robust, and cost-effective

What we’re looking for

• Degree-qualified in Mechanical Engineering (or similar)
• 3+ years’ experience in mechanical design for defence, aerospace, or ruggedised electronics
• Strong CAD capability (SolidWorks preferred), with a solid understanding of GD&T and material selection
• Experience designing for harsh environments, including vibration, shock, and thermal constraints
• Familiarity with MIL-STD-810, DEF-STAN, and structured quality systems (ISO 9001)
• Detail-oriented engineer who’s comfortable working to tight technical and regulatory requirements

Nice to have (but not essential)

• Exposure to electromechanical integration
• Understanding of DFM/DFA for low-volume, high-reliability production
• Experience working with defence documentation and procurement standards

What’s on offer

• Competitive salary aligned with experience
• Pension scheme
• Flexible working options
• Ongoing training and professional development
• The chance to work on long-life defence and aerospace programmes with real-world impact

If this Mechanical Design Engineer is of interest, then please apply with an up-to-date CV and contact information.