Senior Mechanical Design Engineer – Thermal

Job Title: Senior Mechanical Design Engineer – Thermal

Location: Colchester

Salary: GBP60,000 to GBP70,000

Employment Type: Permanent

Working Arrangements: Hybrid working

We re supporting a long established technology company in Colchester as they continue to expand their engineering capability. They design and manufacture high performance electronic systems for defence, aerospace and industrial environments, and due to a strong order book, they re looking to add a Senior Thermal Mechanical Engineer to the team.

This is a hands on, end to end role where you ll own thermal performance across complex electromechanical products – from requirements review through to prototype build, test and production support.

What you ll be doing

• Reviewing requirements and contributing to early system architecture discussions.
• Creating initial conceptual mechanical designs.
• Running detailed structural and thermal analysis (SolidWorks + Flow Simulation preferred).
• Presenting work at preliminary and critical design reviews.
• Managing projects independently while collaborating with PMs, hardware, software and manufacturing teams.
• Investigating production issues, quality problems and root causes under time pressure.
• Building, testing and debugging prototypes in the lab.
• Designing jigs, fixtures and producing assembly drawings with correct GD&T.
• Supporting new product introduction and exploring new thermal technologies (heat pipes, vapour chambers, advanced TIMs).

What you ll bring

• Strong understanding of thermal principles in electronics.
• Practical, hands on industry experience – typically around 5–10 years.
• Proven experience with SolidWorks
• Ability to work dynamically, independently and think creatively.
• Comfortable engaging with suppliers, project managers and cross functional teams.
• Strong problem solving mindset someone who doesn t sit on problems and enjoys time in the lab.

This role requires the successful candidate to pass BPSS screening and meet the eligibility criteria for Security Check (SC) clearance.

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