Principal Mechanical Design Engineer Location: Derby | Agile / Hybrid Working Salary: Competitive + Bonus + Excellent Benefits Lead Mechanical Design on Complex, Low-Carbon Building Projects This is a key hire within a growing building services consultancy, offering the opportunity to take ownership of mechanical design delivery across technically challenging, multi-sector projects. You will operate as a project leader and technical authority, influencing design standards, mentoring engineers, and working directly with clients across the full project lifecycle. With a strong pipeline of sustainable, design-led projects, this role offers both technical depth and clear progression into senior leadership. What’s on Offer Clear progression pathway into senior leadership Agile / flexible working model Generous annual leave (with buy/sell options) Enhanced family leave policies Cycle to Work and Electric Vehicle schemes Employee Assistance Programme and wellbeing support Exposure to technically challenging, sustainability-focused projects Regular team, social, and charitable initiatives The Role Lead mechanical design delivery across projects, from concept through to completion Act as Project Leader, managing design coordination and client interaction Produce and oversee calculations, specifications, and detailed design outputs Drive technical excellence within the team, mentoring junior engineers Contribute to l...