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Please double check you have the right level of experience and qualifications by reading the full overview of this opportunity below. I'm working with a leading organisation in the commercial decarbonisation and offsite-prefabricated energy sector, who deliver innovative mechanical and electrical solutions across the UK, Ireland, and Europe. Due to continued growth, they are seeking a Principal Mechanical Design Engineer to join their expanding design team at their modern Banbridge or Newtownabbey facility. This is a superb opportunity for an experienced engineer to take ownership of complex mechanical design projects, contribute to industry-leading low-carbon solutions, and play a key role in shaping best practice within a highly skilled engineering team. Your new role In this senior role, you will lead mechanical design activities from concept through to commissioning, collaborating closely with fabrication, project management and commissioning teams to ensure seamless project delivery. You'll work across a broad portfolio of commercial decarbonisation projects, while also supporting junior engineers and helping drive continuous improvement in design processes. Lead the design and delivery of mechanical solutions for commercial decarbonisation projects Produce detailed mechanical designs including schematics, calculations, plant selections and project specifications Develop and validate BMS control strategies from initial design through to on-site optimisation Carry out site surveys, assessments and feasibility studies across the UK Work closely with fabrication teams to ensure designs translate accurately into manufactured solutions Support commissioning activities, including BMS proofing and optimisation Ensure all work meets health & safety, quality and regulatory requirements Attend internal and external design meetings; liaise professionally with clients, suppliers and contractors Mentor junior engineers and contribute to knowledge sharing and team development What you'll need to succeed Degree in Mechanical Engineering, Building Services Engineering, or related discipline Chartered Engineer status (CIBSE or equivalent) Minimum 5 years' experience in a similar mechanical design role Strong experience with LTHW, MTHW and steam heating systems Solid understanding of UK & European design standards and legislation Confident communicator with strong organisational and problem-solving skills Ability to manage your own workload while contributing to wider team objectives Experience with site surveys, energy assessments, audits and service coordination Fluency in written and spoken English Desirable

Proficiency with AutoCAD, Revit and BIM 360 Experience using IES, Hysopt or similar simulation software Knowledge of decarbonisation strategies and energy-efficiency measures Hands-on experience with heat pump technologies (including >1MW systems) Understanding of refrigerants, heat pump optimisation and system design Experience with solar thermal, district heating or large-scale energy networks Experience in data centre applications (HTG & CHW systems) BREEAM experience and building energy monitoring/verification What you'll get in return This is an excellent opportunity for a Principal Mechanical Design Engineer who wants to take the lead on cutting-edge decarbonisation projects while working in a forward-thinking, innovative environment. You'll have real influence, strong career progression and the chance to help shape the next generation of sustainable mechanical design. Benefits

Highly attractive salary Full in-house training and ongoing career development Competitive pension scheme Life assurance Health cash plan Free annual health check 30 days annual leave (increasing with service) Regular social and wellbeing events Free onsite parking Free tea, coffee, hot chocolate and fruit daily Modern, supportive working environment What you need to do now If you're interested in this role, click 'apply now' to forward an up-to-date copy of your CV, or call us now. If this job isn't quite right for you, but you are looking for a new position, please contact us for a confidential discussion about your career. xehkeey Hays Specialist Recruitment Limited acts as an employment agency for permanent recruitment and employment business for the supply of temporary workers. By applying for this job you accept the T&C's, Privacy Policy and Disclaimers which can be