Data Center Mechanical Engineer: Critical Cooling Expert

Apex Systems; Greater London; On-site; GBP 45,000 - 65,000; Full time

Job summary

Apex Systems is seeking a mechanically biased Data Center Facility Engineer to support operation and maintenance of critical cooling and water infrastructure in a data centre environment.

The role collaborates with electrical and controls teams to own mechanical systems and fluid management across the facility, performing routine maintenance and troubleshooting with a strong focus on reliability and uptime.

Qualifications

• Experience with mechanical building services, HVAC, or critical cooling infrastructure.
• Ability to read and interpret technical drawings, schematics, and maintenance procedures.
• Knowledge of water hygiene, Legionella control, ACOP L8, and HSG274 guidance.

Responsibilities

• Operate, maintain, and troubleshoot mechanical cooling infrastructure including chillers, AHUs, FCUs, pumps, and related plant.
• Maintain chilled water and pressurised water systems, including pipework and valves.
• Carry out planned preventative maintenance and reactive repairs on mechanical assets.
• Perform pressure testing, leak detection, inspections, and fault diagnosis on cooling/water systems.
• Monitor system performance and identify efficiency improvements.
• Support commissioning and decommissioning during upgrades and capacity expansions.

Skills

Mechanical services

HVAC systems

Critical cooling

Chillers

AHUs

Pumps

Pipework

Reading drawings

Legionella control

Water hygiene

BMS/SCADA

Fluid distribution

Education

NVQ Level 3 in Mechanical/Building Services or related discipline

Tools

BMS/EPMS/SCADA monitoring systems

Job description

Apex Systems is seeking a mechanically biased Data Center Facility Engineer to support operation and maintenance of critical cooling and water infrastructure in a data centre environment.

The role collaborates with electrical and controls teams to own mechanical systems and fluid management across the facility, performing routine maintenance and troubleshooting with a strong focus on reliability and uptime.