Data Center Facility Engineer, Data Center Engineering Operations

- 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) in Mechanical, Electrical or Mechatronics
- Work a flexible schedule/shift/work area, including weekends, nights, and/or holidays
- Demonstrable experience working with pressurised water systems, pipework installations, and fluid distribution networks
- Knowledge of ACOP L8 (Legionnaires' disease: The control of legionella bacteria in water systems) and HSG274 guidance, with experience implementing compliant water treatment regimes
- Practical understanding of fluid dynamics principles including flow rates, pressure drop, cavitation, and heat transfer - Experience with EPMS/SCADA/BMS controls system software or hardware
- Direct experience with liquid cooling technologies such as CDUs, rear-door heat exchangers, or direct-to-chip cooling
- City & Guilds 2079 or equivalent Legionella control qualification
- Knowledge of water treatment processes including closed-loop and open-loop system management, corrosion inhibitors, and microbiological control
- IOSH Managing Safely or NEBOSH General Certificate
- Experience with commissioning or decommissioning of mechanical systems
- Understanding of cooling architectures and thermal management principles

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AWS Infrastructure Services owns the design, planning, delivery, and operation of all AWS global infrastructure. In other words, we're the people who keep the cloud running. We support all AWS data centers and all of the servers, storage, networking, power, and cooling equipment that ensure our customers have continual access to the innovation they rely on. We work on the most challenging problems, with thousands of variables impacting the supply chain - and we're looking for talented people who want to help.

Key job responsibilities
• Install, maintain, and repair pipework, fittings, valves, and manifolds across cooling distribution loops, chilled water systems, and condenser 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 pressurised water circuits
• Manage water treatment programmes in line with ACOP L8 and HSG274 requirements, including legionella risk assessments, temperature monitoring, chemical dosing, and biocide application
• Maintain and troubleshoot pumps, heat exchangers, coolant distribution units (CDUs), and associated mechanical components
• Monitor thermal performance of cooling systems and identify opportunities to optimise flow rates, delta-T, and energy efficiency
• Support commissioning and decommissioning of mechanical cooling infrastructure during capacity additions
• Perform routine preventive maintenance on mechanical assets including filter changes, belt replacements, pump seal replacements, bearing inspections, and valve servicing
• Respond to alarms and incidents related to leaks, pressure anomalies, thermal exceedances, or water quality deviations within SLA
• Maintain accurate records of maintenance activities, water treatment logs, system parameters, and defect logs
• Collaborate with controls engineers on BMS/SCADA integration for mechanical plant monitoring
• Adhere to all site safety procedures including permit-to-work, LOTO, and working at height protocols
• Work safely at all times, following risk assessments, method statements, and safe systems of work (SSOW) for all maintenance and operational activities
• Support continuous improvement initiatives to enhance system reliability and reduce mean time to repair

A day in the life
Diverse Experiences
AWS values diverse experiences. Even if you do not meet all of the preferred qualifications and skills listed in the job description, we encourage candidates to apply. If your career is just starting, hasn't followed a traditional path, or includes alternative experiences, don't let it stop you from applying.
Why AWS?
Amazon Web Services (AWS) is the world's most comprehensive and broadly adopted cloud platform. We pioneered cloud computing and never stopped innovating - that's why customers from the most successful startups to Global 500 companies trust our robust suite of products and services to power their businesses.
Inclusive Team Culture
Here at AWS, it's in our nature to learn and be curious. Our employee-led affinity groups foster a culture of inclusion that empower us to be proud of our differences. Ongoing events and learning experiences, including our Conversations on Race and Ethnicity (CORE) and AmazeCon (gender diversity) conferences, inspire us to never stop embracing our uniqueness.
Mentorship & Career Growth
We're continuously raising our performance bar as we strive to become Earth's Best Employer. That's why you'll find endless knowledge-sharing, mentorship and other career-advancing resources here to help you develop into a better-rounded professional.
Work/Life Balance
We value work-life harmony. Achieving success at work should never come at the expense of sacrifices at home, which is why we strive for flexibility as part of our working culture. When we feel supported in the workplace and at home, there's nothing we can't achieve in the cloud.

About the team
Amazon Web Services Data Center Engineering Operations (DCEO) 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 centre portfolio. And you'll experience an inclusive culture that welcomes bold ideas and empowers you to own them to completion. (AIS tagline)

You will work directly with air handling units, chillers, cooling towers, evaporative cooling systems, liquid cooling distribution, and associated water treatment plant. The role demands strong mechanical aptitude with specific expertise in plumbing, pipework, pressurised water systems, and fluid dynamics. You will be responsible for maintaining system integrity, ensuring compliance with ACOP regulations, optimising thermal performance, and supporting the scaling of cooling capacity as our fleet grows.
This is a shift-based role requiring flexibility to support 24/7 data centre operations. You will work alongside electrical and controls engineers but your primary focus is mechanical systems and fluid management.