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Client OverviewOur exclusive client is a global contractor leading in energy, digital, and industrial transitions, delivering bespoke solutions across infrastructure, buildings, and processes. With a strong presence in the UK and internationally, this organisation is renowned for its commitment to innovation, sustainability, and operational excellence. The company operates across a diverse portfolio, including data centres, clean rooms, pharmaceutical facilities, and other mission critical environments, ensuring high-performance engineering solutions that meet the most demanding standards.Role OverviewOur client is looking for an ambitious Senior or Principal Mechanical Design Engineer.You will play a key role in the design and delivery of mechanical systems for mission critical projects. Reporting to the Head of Mechanical Design, your responsibilities will include:Developing detailed mechanical designs for HVAC, chilled water, and specialist systems.Supporting project delivery from concept through to construction and commissioning.Collaborating with internal teams, clients, and external consultants to ensure design integrity.Conducting technical reviews, calculations, and system simulations.Assisting in mentoring junior engineers and contributing to continuous improvement.You will be involved in high-value, technically complex projects where precision and reliability are paramount.RequirementsDegree qualified in Mechanical Engineering or other relevant subject.Proven experience in mechanical design engineering within mission critical sectors.Strong technical knowledge of HVAC, chilled water systems, and cleanroom design.Excellent proficiency in industry standard design tools such as AutoCAD,