An exciting opportunity has arisen for a Principal Mechanical Design Engineer to join one of the leading companies in RF and Sensing technology, based in Essex.Part of a globally recognised organisation, this company is shaping innovation across the medical, aerospace, and defence industries. Their expertise has contributed to world-class projects such as the Hubble Space Telescope, cancer radiotherapy machines, and advanced driver-assistance systems in luxury vehicles. They are seeking a Principal Mechanical Design Engineer to join their RandD division. This role will be instrumental in developing new products and driving the next phase of the company''s growth.The position requires someone hands-on, adaptable in day-to-day tasks, and keen to work collaboratively with the mechanical engineering team lead, process engineers, project lead engineers, and project managers. Key responsibilities for this Principal Mechanical Design Engineer role based in Essex:Lead mechanical design and development, from customer specifications through to delivery of high-quality, on-time solutionsProduce and maintain technical documentation, including drawings, test plans, and reportsContribute to design reviews and resolve technical challenges in collaboration with process engineersIdentify risks and deliver robust, independent solutionsStay up to date with new technologies and support process development and industrialisation Desirable Experience for this Principal Mechanical Design Engineer ro