Mechanical Design Engineer – Salary up to £50K + Benefits - Cardiff Are you a mechanical design engineer passionate about low-carbon design and sustainable energy? Our client — an innovative engineering consultancy leading the way in heat decarbonisation — is looking for a Mechanical Design Engineer to join their growing team. You’ll deliver detailed mechanical designs for plant rooms and building services, support major low-carbon heat projects across the UK, and play a key role in shaping efficient, future-ready energy systems. What you’ll bring ✅ Experience designing mechanical building services ✅ Strong understanding of plant rooms, heating, cooling, and distribution systems ✅ Proficiency with CAD tools (Revit, CAD, SketchUp) ✅ Ability to collaborate across engineering teams and communicate clearly with clients ✨ Desirable: experience in low-carbon/renewable systems or working toward Chartership What you’ll do 📐 Develop detailed mechanical designs (RIBA/BSRIA Stages 3–4) 📝 Produce drawings, schematics, specifications, and project documentation 📊 Complete load calculations, pipework sizing, and technical assessments 🏗 Carry out site surveys of existing plant and distribution systems 🤝 Support tender reviews and contractor evaluation 🧩 Work closely with internal low-carbon s...