Mechanical Commissioning Engineer

Job Description

Mechanical Commissioning Engineer 12 Months Outside IR35 - £600 per day London and South Wales - Site Based Data Centres / Mission-Critical Infrastructure PROJECT OVERVIEW 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. TPBN1_UKTJ