Data Centre Engineer at Apex Systems US, London, Greater London

Data Center Facility Engineer, Data Center Engineering Operations

Location: LONDON, United Kingdom (Onsite)

Role Overview

Our organization is seeking a mechanically-biased Engineering Operations Technician to join our team. This hands-on role is focused on the installation, maintenance, and troubleshooting of mechanical cooling and water systems infrastructure across our data center portfolio. The ideal candidate must have a data center background and will work directly with air handling units, chillers, cooling towers, and associated water treatment plant. This is a shift-based role requiring flexibility to support 24/7 operations.

Key Responsibilities

• Install, maintain, and repair pipework, fittings, valves, and manifolds across cooling distribution loops and water circuits.
• Operate and maintain air handling units (AHUs), chillers, cooling towers, evaporative cooling systems, and liquid cooling infrastructure.
• Perform pressure testing, leak detection, and system integrity checks on pressurized water circuits.
• Manage water treatment programs in line with ACOP L8 and HSG274 requirements.
• Maintain and troubleshoot pumps, heat exchangers, coolant distribution units (CDUs), and associated mechanical components.
• Monitor thermal performance of cooling systems to optimize flow rates and energy efficiency.
• Support commissioning and decommissioning of mechanical cooling infrastructure.
• Perform routine preventive maintenance on mechanical assets.
• Respond to alarms and incidents related to leaks, pressure anomalies, or thermal exceedances.
• Maintain accurate records of maintenance activities, water treatment logs, and system parameters.
• Collaborate with controls engineers on BMS/SCADA integration for mechanical plant monitoring.
• Adhere to all site safety procedures including permit-to-work and LOTO.

Required Qualifications

• Must have data center background.
• Demonstrable experience working with pressurized water systems, pipework installations, and fluid distribution networks.
• Knowledge of mechanical systems (Mechanical, HVAC systems, Controls).
• Experience reading and writing procedures, technical documents, and engineering drawings.
• Knowledge of generic mechanical room infrastructure such as chillers, cooler units, and fan controls.
• NVQ Level 3 in Mechanical, Electrical or Mechatronics, or NFQ Level 3 (or equivalent).
• Knowledge of ACOP L8 and HSG274 guidance, with experience implementing compliant water treatment regimes.
• Practical understanding of fluid dynamics principles including flow rates, pressure drop, and heat transfer.
• Ability to work a flexible schedule, including weekends, nights, and holidays.

Preferred Qualifications

• Experience with EPMS/SCADA/BMS controls system software or hardware.
• Direct experience with liquid cooling technologies such as CDUs or rear-door heat exchangers.
• City & Guilds 2079 or equivalent Legionella control qualification.
• Knowledge of water treatment processes including closed-loop and open-loop system management.
• IOSH Managing Safely or NEBOSH General Certificate.
• Experience with commissioning or decommissioning of mechanical systems.
• Understanding of cooling architectures and thermal management principles.
• Preferred backgrounds include construction, banking, or manufacturing/factory environments.

Why Join Us

We are continuously raising our performance bar. You will find knowledge-sharing, mentorship, and other career-advancing resources here to help you develop into a better-rounded professional. We value work-life harmony and strive for flexibility as part of our working culture. Our employee-led affinity groups foster a culture of inclusion that empowers us to be proud of our differences.