Mechanical Engineer (Cooling, HVAC & Pipe-fitting Systems)

Mechanical Engineer / Mechanical Site Engineer Cooling, HVAC & Pipefitting Systems

Location: London, UK

Travel: Frequent travel London, Slough, Cambridge, Manchester

Salary: £50,000 £70,000 per annum + Van

Sector: Data Centers Mission Critical Infrastructure

Job Type: 18-Month Contract to Permanent

The Opportunity

We are seeking an experienced Mechanical Engineer / Mechanical Site Engineer with a background in cooling systems, HVAC, pipe-fitting, chilled water, liquid cooling, or mechanical building services to support the delivery of major data centre projects across Portugal and Europe.

This is an permanent opportunity, offering the chance to work on large-scale mission-critical projects with a long-term pipeline of work across Europe. The successful candidate will support the installation, coordination, testing, and commissioning of critical mechanical infrastructure while contributing to the delivery of advanced data centre facilities designed to support cloud computing and AI technologies.

Key Responsibilities

Support the delivery of mechanical packages on major data centre projects.

Coordinate the installation of chilled water, cooling water, HVAC, liquid cooling, and mechanical piping systems.

Review and interpret engineering drawings, specifications, and technical documentation.

Monitor installation quality and ensure compliance with project standards and industry regulations.

Coordinate with subcontractors, suppliers, consultants, commissioning teams, and project stakeholders.

Assist with procurement, material tracking, and project reporting.

Support testing, flushing, pressure testing, commissioning, and system handover activities.

Identify and resolve technical issues during installation and commissioning phases.

Maintain project records, quality documentation, and progress reports.

Ensure all activities are delivered in accordance with health, safety, and environmental requirements.

Support project delivery across multiple European locations as required.

Mechanical & Cooling Systems Experience

Candidates should have experience with some or all of the following:

Chilled Water Systems (CHW)

Cooling Water Systems (CW)

HVAC Installations

Mechanical Pipework Systems

Pipefitting Installation & Coordination

Pumping Systems

Plant Room Installations

Heat Rejection Systems

CRAH / CRAC Units

Building Services Infrastructure

Mechanical Testing & Commissioning

Leak Detection Systems

BMS Integration

Highly Desirable Data Centre Cooling Experience

Experience with modern data centre cooling technologies is highly advantageous, including:

RDHx (Rear Door Heat Exchangers)

CDUs (Cooling Distribution Units)

Direct-to-Chip Liquid Cooling

Liquid Cooling Infrastructure

High-Density Rack Cooling Systems

Secondary Cooling Loops

AI Data Centre Cooling Environments

Cooling System Commissioning & Validation

Requirements

• Previous experience delivering mechanical installation, construction, commissioning, or maintenance projects.
• Strong understanding of HVAC, chilled water, cooling water, cooling, and mechanical piping systems.
• Experience working within data centres, mission-critical facilities, industrial, pharmaceutical, manufacturing, energy, or large commercial construction environments.
• Ability to read and interpret engineering drawings and technical specifications.
• Excellent communication and coordination skills.
• Experience working with subcontractors, suppliers, and multidisciplinary project teams.
• Competent in Microsoft Office and project reporting tools.
• Fluent English communication skills, both written and spoken.
• Willingness and ability to travel extensively across Europe.
• Full right to work within the EU or ability to obtain the necessary work authorisation.

Desirable Qualifications & Certifications

• CSCS Card
• ECS Card
• SSSTS (Site Supervisor Safety Training Scheme)
• SMSTS
• First Aid at Work
• Relevant Mechanical or Building Services Certifications

Preferred Industry Experience

Experience in one or more of the following sectors is preferred:

• Data Centres
• Mission Critical Facilities
• Colocation Data Centres
• Pharmaceutical Manufacturing
• Semiconductor Facilities
• Industrial Manufacturing Plants
• Energy & Utilities Infrastructure
• High-Tech Construction Projects