Senior Mechanical Design Engineer – Building Services Location: Cardiff Salary: Competitive (dependent on experience) Benefits: 25 days holiday bank holidays, pension, flexible & hybrid working Role Overview We are seeking a Senior Mechanical Design Engineer to join a busy and growing building services consultancy in Cardiff. This is an excellent opportunity to lead mechanical engineering design projects across commercial, residential, healthcare, education, and industrial sectors. As a Senior Mechanical Design Engineer, you’ll have autonomy over your work, manage multi-disciplinary projects, mentor junior engineers, and help shape the technical direction of the business. Key Responsibilities Lead mechanical design and engineering on projects from concept through to completion Prepare and review detailed calculations, specifications, and design documentation Produce high-quality drawings and BIM/Revit models Manage project deliverables including design risk assessments, client liaison, and coordination with multi-disciplinary teams Mentor and support junior and intermediate engineers Ensure designs comply with UK standards and regulations (CIBSE, Building Regulations, Part L) Stay updated with industry best practices, emerging technologies, and sustainability trends Contribute to business development and maintain strong client relationships Skills & Experience Degree in Mechanical or Building Services Engineering (BEng, MEng, or equivalent) Typically 6 years’ experience in mechanical building services consultancy Strong technical knowledge of HVAC systems, heating, ventilation, cooling, and renewable technologies Proficient with AutoCAD, Revit, and mechanical calculation tools Proven ability to manage projects and lead design teams Excellent communication and interpersonal skills Understanding of UK building regulations, CIBSE guides, and sustainable design principles Chartered status (CEng, MCIBSE) preferred but not essential Why Join? Work on varied, challenging projects with high-profile clients Take leadership responsibilities and influence project outcomes Collaborative, supportive environment with flexible and hybrid working options Access to professional development and training programs Competitive salary and benefits package If you’re a Senior Mechanical Design Engineer ready to advance your career and work on technically challenging projects in Cardiff, apply now for a confidential discussion