Shift Mechanical Engineer – Data Centre (Liquid Cooling)

12-hour rotating shifts

Location: Slough Data Centre

Shift Pattern: Continental shifts, 12-hour rotation, 24/7/365 operation

Reports to: Critical Facilities Manager

Lead Liquid Cooling Engineer

The Role

We are looking for an experienced Shift Mechanical Engineer to operate, maintain and support the liquid cooling systems within a live data centre.

The role focuses on Coolant Distribution Units (CDUs) and secondary-side cooling infrastructure supporting high-density AI and high-performance computing (HPC) environments.

You will be responsible for maintaining cooling performance, responding to faults and ensuring the data centre operates safely and without disruption.

Key Responsibilities

• Monitor and maintain CDUs, pumps, pipework, heat exchangers, valves, filtration and leak detection systems.

• Monitor temperatures, pressures, flow rates and water quality through BMS, DCIM and local controls.

• Carry out planned preventative maintenance (PPM), inspections and mechanical servicing.

• Diagnose and respond to cooling faults, leaks, pump failures and system alarms.

• Carry out water sampling, testing and support chemical treatment.

• Follow emergency procedures to restore cooling and protect critical IT equipment.

• Complete shift handovers, maintenance records, permits and incident reports.

• Work in accordance with RAMS, MOPs, SOPs, EOPs and safe isolation procedures.

• Supervise specialist contractors and OEM engineers, supporting commissioning, fault investigations and system improvements.

Essential Qualifications & Experience

• Experience working in mission-critical facilities and data centre cooling environments.

• Strong knowledge of chilled water and closed-loop cooling systems.

• Experience maintaining pumps, valves, actuators, heat exchangers and filtration systems.

• Knowledge of water treatment, leak detection and water quality management.

• Experience using BMS systems for monitoring, alarms and fault diagnosis.

• Understanding of Permit-to-Work systems and safe working procedures.

• Experience responding to mechanical emergencies in live operational environments.

Desirable Experience

• Direct-to-chip liquid cooling and CDU systems.

• AI and high-performance computing (HPC) data centres.

• Liquid cooling equipment from Schneider, Vertiv, CoolIT, Motivair, Stulz or equivalent.

• Experience in Tier III or Tier IV data centres.

• Critical Facilities Management and 24/7 engineering operations.

Key Skills

The successful candidate will be confident fault-finding on mechanical cooling systems, able to respond effectively to critical incidents and comfortable working independently as part of a rotating shift team. Good communication, accurate reporting and a strong understanding of health and safety are essential.

To apply, please send CV ASAP for immediate response.