Senior Principal Mechanical Engineer — Fusion & Nuclear

Assystem is seeking a Senior Principal Mechanical Engineer to join its Fusion and Modular Nuclear unit in the UK. You will lead designs for cooling water systems and related reactor components, driving DFMEA/HAZID activities and managing interfaces across engineering teams and suppliers.

This role requires Chartered Engineer status, SC clearance eligibility, and the ability to work in a hybrid environment with some UK travel.

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