Commissioning Engineer - Critical Cooling

We’re recruiting a Commissioning Engineer to join a specialist OEM team delivering large-scale data centre and critical cooling projects across the UK, with occasional European project support. This is a commissioning-led role, not service. You’ll take ownership of complex cooling systems from first power-up through to final sign-off on high-value, mission-critical sites. What You’ll Be Doing You’ll lead the commissioning of full data centre cooling infrastructure, including chillers, AHUs, CRAC/CRAH units and fan wall systems. The role covers functional testing, optimisation, controls integration, documentation and client handovers. Work is predominantly UK-based (London and South East heavy), with planned project travel rather than reactive call-outs. You’ll work closely with advanced controls platforms including BACnet and Modbus, supporting integration with site BMS systems. This is a mobile, autonomous position where engineers are trusted to manage their own time and represent the business on complex project sites. What You’ll Need Proven commissioning experience at sign-off level with chillers, AHUs and CRAC/CRAH systems Strong controls knowledge, including BACnet and Modbus Previous data centre or critical cooling commissioning experience Comfortable working independently on complex, live or near-live sites Confident producing commissioning documentation and leading client handovers Full UK driving licence Willingness to travel, including occasional European projects Salary, Earnings & Package £48,000 – £52,000 base salary (DOE), structured to deliver strong total annual earnings. The package includes: Door-to-door travel paid Time-and-a-half paid on all hours worked beyond 40 per week (including travel) Consistent, predictable overtime due to long-term project delivery Pension contributions calculated on full earnings Company vehicle with private use, laptop, tablet, tools and high-spec equipment Paid travel, accommodation and expenses Ongoing OEM training on critical cooling systems and controls For engineers comfortable with site-based project work, the structure delivers earnings well beyond the headline base , alongside stability and high-quality projects. What’s Next If you’re a commissioning engineer looking to work on serious infrastructure with paid travel, consistent overtime and a business that values technical competence, get in touch for a confidential conversation or send over your CV to find out more