Mechanical Commissioning Engineer

PROJECT OVERVIEW

Mechanical Commissioning Engineer 12 Months Outside IR35 - £600 per day London and South Wales - Site Based Data Centres / Mission-Critical Infrastructure

RESPONSIBILITIES

• Lead mechanical commissioning activities across data centre developments.
• Oversee commissioning of chilled water systems, chillers, CRAH/CRAC units, AHUs, pumps and associated HVAC equipment.
• Coordinate pre-commissioning inspections, pressure testing, flushing and system balancing.
• Manage functional performance testing of critical cooling infrastructure.
• Support Integrated Systems Testing (IST), including cooling failure simulations, redundancy testing and recovery procedures.
• Coordinate mechanical subcontractors, specialist vendors and commissioning teams.
• Review mechanical drawings, P&IDs, commissioning procedures and technical documentation.
• Monitor commissioning progress against programme milestones.
• Identify and resolve commissioning defects and outstanding works.
• Coordinate with electrical commissioning teams to ensure integration of mechanical and electrical systems.
• Prepare commissioning reports, test records and handover documentation.

SKILLS / REQUIREMENTS

• Proven mechanical commissioning experience within data centres or mission-critical environments.
• Strong technical knowledge of chilled water systems, HVAC plant and critical cooling infrastructure.
• Experience commissioning CRAH/CRAC units, AHUs, chillers and pumps.
• Understanding of data centre redundancy and cooling resilience.
• Experience managing subcontractors and specialist equipment vendors.
• Familiarity with FAT, SAT, functional performance testing and IST.
• Ability to interpret mechanical drawings, P&IDs and technical specifications.
• Strong commissioning documentation and handover experience.

CERTIFICATIONS

• HNC/HND or degree in Mechanical Engineering, Building Services or equivalent experience.
• CSCS card.
• SMSTS or SSSTS desirable.
• Relevant site safety qualifications.

DESIRABLE

• Hyperscale data centre commissioning experience.
• Experience working on live mission-critical facilities.
• Familiarity with commissioning management platforms such as CxAlloy.
• Experience with high-density or liquid cooling systems.
• Knowledge of BMS integration and mechanical control strategies.