Principal Mechanical Design Engineer - Near Edinburgh (Hybrid) Lorien is supporting their longstanding, highly regarded and Scottish-born client in the search for a Principal Mechanical Design Engineer to join its product development team. This is a senior-ranking opportunity for someone who enjoys leading complex design work, shaping technical direction, and working across multidisciplinary projects in a precision-led environment. Role Outline Provide technical leadership on complex mechanical design projects including new technologies and product improvements from concept through to release. Set direction on design approach, lead system-level architecture, and embed engineering best practice across the wider team. Work closely with colleagues across engineering, manufacturing, quality, and supply chain to deliver robust solutions. Support prototype development, testing, and product validation activities. Lead design reviews, problem-solving activities, and continuous improvement initiatives. Oversee technical documentation, drawings, and engineering standards to ensure quality and compliance. Use analysis, modelling, and experimental data to guide design decisions. Mentor other engineers and contribute to capability building within the team. Help shape future development plans by contributing ideas for new technology and product improvement.What they're looking for A strong background in mechanical design within a complex e...