Principal Design Engineer - Advanced Mechanical Systems Location: Surrey (Hybrid working available) Type: Permanent, Full-Time Salary: £60-80K Bonus Benefits Overview: iO Associates have partnered with a specialist engineering consultancy is seeking a Principal Design Engineer to lead the development of complex mechanical systems across aerospace, defence, and high-performance technology sectors. This is a senior technical leadership role offering autonomy, cross-functional collaboration, and the opportunity to shape design capability within a high-talent team. Key Responsibilities: Lead 3D CAD design from concept through to detailed development Review and approve technical drawings and design schemes Collaborate with structural and fluids analysts to resolve design challenges Conduct internal and external design reviews Support the Chief Engineer and contribute to technical governance Mentor and coach junior engineers, promoting best practice What You'll Bring: Expert-level experience in mechanical design and CAD (e.g. Siemens NX, SolidWorks, or similar) Strong understanding of design for manufacture, assembly, and performance Experience working in multi-disciplinary teams Proven ability to lead projects and mentor others Chartered Engineer status (or working towards) Benefits: Hybrid working model (office-based during onboarding, then flexible) Private healthcare via Bupa (includes mental health and dental) Twice-yearly bonus scheme (performance-based) Company pension and life insurance Funded CPD and support towards chartership or fellowship Cycle to work scheme Regular team socials and a collaborative, coaching-focused culture If you meet most of the critieria, dont't hesitate to get in touch and apply today.