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.
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