Commissioning / CxM Lead - Data Centre - Europe

ROSS; Dublin; On-site; EUR 90,000 - 120,000; Full time

Job summary

ROSS is seeking a Mechanical Commissioning Engineer/ CxM Lead for a hyperscale data centre program across Europe, with emphasis on Ireland and the Netherlands. Responsibilities include leading the mechanical commissioning scope, driving Level 1–3 testing, and collaborating with clients and contractors to deliver safe, on-time handovers.

The role requires strong mechanical engineering background, 5+ years in commissioning, and capability to travel as projects demand.

Qualifications

• 5+ years in mechanical commissioning, ideally data centre or mission-critical environments.
• Hands-on knowledge of chilled water systems, air handling and heat rejection in critical environments.
• Ability to manage commissioning programmes, coordinate with clients and contractors.

Responsibilities

• Lead the mechanical commissioning scope on new data centre builds and upgrades.
• Manage Level 1–3 testing, from factory witness testing to integrated systems testing.
• Sign off on chillers, AHUs, pipework and valves and oversee TAB and flow verification.
• Own punch lists, completion status and turnover packages for mechanical systems.

Skills

Mechanical commissioning

Leadership

Project coordination

Travel readiness

Education

Mechanical or Building Services degree

Apprenticeship + site experience

Job description

Mechanical Cx Lead / Mechanical CxM — Europe

ROSS Cx supports major data centre and mission-critical projects across Ireland and EMEA. We deliver commissioning across electrical, mechanical, and management disciplines, working with contractors and clients to test, prove, and hand over critical infrastructure safely and on time.

ROSS Cx is hiring a Mechanical Commissioning Engineer/CxM Lead for a hyperscale data centre program in the Netherlands.

This is a long-term assignment with real ownership of the mechanical Cx scope

CxM Lead What you'll be doing:

• Leading the mechanical commissioning scope on new data centre builds and upgrade works
• Running the full Level 1 to Level 3 process, from factory witness testing through to integrated systems testing and pull-down
• Witnessing and signing off chillers, cooling towers, dry coolers, CRAH and CRAC units, AHUs, pumps, pipework and valves
• Chilled water system flushing, cleaning, pressure testing and chemical treatment sign-off
• Water and air balancing, TAB oversight, and verification of flow rates against design
• Load bank testing and thermal performance proving, including failure mode and failover scenarios
• Reviewing and approving contractor method statements, scripts and test sheets before systems go live
• Managing the mechanical commissioning programme and sequencing against the wider construction schedule
• Owning the punch list, completions status and turnover packages for mechanical systems
• Acting as main point of contact for the client, GC and specialist contractors on mechanical Cx matters
• Chairing readiness reviews and reporting progress and metrics to the project team
• Mentoring mechanical Cx engineers and supporting handover to operations and facilities

What we're looking for:

• 5+ years in mechanical commissioning, ideally data centre or mission-critical, though strong candidates from pharma, semiconductor or large commercial HVAC will be considered
• Mechanical trade or engineering background. Degree in Mechanical or Building Services Engineering, or an apprenticeship backed by the right site experience
• Hands-on knowledge of chilled water systems, air handling and heat rejection in a critical environment
• Comfortable running a commissioning programme, not just witnessing tests
• Able to hold contractors to a standard and keep the client onside at the same time
• Flexibility to travel across Ireland and mainland Europe as projects require

If you’re a results-oriented CxM or CxE who’s ready to lead critical infrastructure projects, we’d like to hear from you.