Are you an experienced Mechanical Design Engineer ready to take the next step in your career? We are seeking a Principal Mechanical Design Engineer to lead the design and development of complex electro-mechanical systems for highly regulated markets. This is a senior, hands-on role offering technical ownership, leadership, and innovation opportunities.

As a Principal Mechanical Design Engineer, you will:

• Lead the design, development, and documentation of complex electro-mechanical systems

• Take technical ownership of projects from concept through to production, testing, and commissioning

• Mentor and guide junior engineers, providing leadership across multidisciplinary teams

• Collaborate closely with electrical, software, and systems engineers to deliver integrated and compliant solutions

• Support continuous improvement initiatives and provide innovative solutions for challenging design problems

As part of the Mechanical Design team, the Principal Mechanical Design Engineer will provide technical direction for mechanical engineering activities across assigned projects and major work packages, ensuring robust engineering decisions, effective cross-functional delivery, and successful progression through the gated development process. This role combines deep engineering capability with strong delivery leadership. The Principal Mechanical Design Engineer will lead complex problem resolution, guide mechanical decision-making, coordinate technical activities with minimal intervention, and act as a key interface between Mechanical Design and other business functions, suppliers and customers. They will also support and mentor other engineers across the business.

The ideal candidate will have significant experience designing complex moving mechanical systems, such as gearboxes, actuators, powertrain systems, rotating machinery, or turbomachinery, bringing proven expertise in tackling high-complexity mechanical challenges.

• Deliver robust mechanical designs for electro-mechanical systems used in high-regulated environments

• Produce CAD models, detailed drawings, and Bills of Materials (BOMs) using SolidWorks

• Conduct design reviews, risk assessments, and technical validation

• Manage and optimise design for manufacturability (DfM) and assembly (DfA)

• Liaise with suppliers and manufacturing teams to ensure designs are practical, cost-effective, and compliant

• Provide leadership and mentorship to design and engineering teams, fostering technical excellence

• Degree-qualified in Mechanical Engineering or related discipline

• Extensive experience in mechanical design of complex electro-mechanical systems

• Proven experience designing complex moving mechanical systems (gearboxes, actuators, powertrain systems, rotating machinery, turbomachinery)

• Strong SolidWorks expertise and CAD modelling capabilities

• Proven experience in high-regulated markets, e.g., automotive, aerospace, or defence

• Strong understanding of mechanical components, assemblies, tolerance stack-ups, and manufacturing methods

• Demonstrated leadership and ability to mentor junior engineers

• Excellent problem-solving, communication, and organisational skills

• Take ownership of high-impact, technically challenging projects

• Lead and shape the work of a growing, innovative engineering team

• Work in an environment that values innovation, quality, and professional growth

• Opportunity to make a real difference in complex, cutting-edge product development

If you are an experienced Principal Mechanical Design Engineer with a strong track record designing complex electro-mechanical and moving mechanical systems, we want to hear from you.