Mechanical Design Engineer Location: Cardiff Salary: £40,000 - £50,000 per year Job Type: Full-time About Us They are a leading UK energy and engineering consultancy specialising in low-carbon heating and district energy networks. Since 1998, the company has been at the forefront of delivering innovative renewable energy projects that make a significant contribution to the UK's decarbonisation goals. The organisation is seeking a Mechanical Design Engineer to join its growing team and play a key role in designing and specifying low-carbon commercial heating projects. What You'll Do Develop detailed mechanical and building services designs for plant rooms and heat distribution systems (RIBA/BSRIA Stages 3 & 4). Produce design documentation and construction drawings, including schematics, GA drawings, technical specifications, and schedules. Use CAD, Revit, and SketchUp to deliver coordinated designs. Perform heat load, cooling load, and pipework/ductwork sizing calculations. Collaborate with internal teams to deliver efficient, integrated solutions. Conduct site surveys and assess existing plant room arrangements. Support tendering processes and review contractor proposals. Ensure compliance with Building Regulations, CIBSE, IET, HSE, and sustainability targets. Manage design projects and procurement packs. Provide on-site engineering support during construction and commissioning. Chair client/projec...