We are seeking an experienced Mechanical Engineer with proven experience in building services, data centre or critical infrastructure environments to join our engineering team. The Mechanical Engineer will act as a technical expert within our engineering function, responsible for design, assurance, and operational support of mechanical systems across our data centre estate. You will play a key role in data centre design, build, and capacity expansion projects, ensuring that all systems, from cooling and ventilation to environmental control, deliver optimal performance and energy efficiency. This position is ideal for a technically capable and innovative engineer who thrives on ensuring the resilience, safety, and efficiency of mechanical systems in high-availability environments. Key Responsibilities Lead or contribute to the design and specification of mechanical systems for data centre and critical infrastructure builds, including HVAC, chilled water, CRAC/CRAH, and free cooling systems. Review and validate design documentation, calculations, and system layouts to ensure compliance with standards and best practice in energy-efficient design. Provide engineering assurance and technical input during concept, detailed de...