Commissioning Lead (Mechanical)

Johnson Controls; Ireland; On-site; EUR 110,000 - 150,000; Full time

Job summary

Silent Aire in Dublin is seeking a Senior Mechanical Commissioning Engineer to own the commissioning strategy for liquid‑cooled data centre systems and to lead regional site teams.

You will define test levels, author procedures, supervise FATs/SATs, and ensure handover readiness while coordinating with electrical and controls specialists. This role requires 10+ years of experience and a calm, authoritative presence under pressure.

Qualifications

• 10+ years’ experience in mechanical commissioning of mission‑critical facilities.
• Demonstrable experience commissioning liquid‑cooled data centre systems.
• Calm and authoritative under pressure.

Responsibilities

• Develop and own the mechanical commissioning strategy for liquid‑cooled data centre products.
• Define commissioning philosophy, test levels, and acceptance criteria.
• Author and maintain mechanical commissioning plans and procedures.
• Audit commissioning execution across regional teams and ensure compliance with standards.
• Witness FAT, SAT, and critical onsite tests; support complex fault finding.
• Collaborate with electrical and controls leads during IST and handover.

Skills

Hydronic design

BMS/PLC interaction

Commissioning leadership

Documentation skills

Travel readiness

Education

Mechanical Engineering

Job description

Commissioning Lead (Mechanical) – Liquid Cooled Data Centres

Silent Aire – Dublin

What you will do

We are seeking a Senior Mechanical Commissioning Engineer to own and lead the commissioning strategy for liquid‑cooled mechanical systems within next‑generation data centre deployments. This role sits within a central commissioning function, responsible for developing commissioning methodology, authoring procedures, and ensuring consistent, high‑quality execution across regional site teams.

The successful candidate will be a recognised technical authority in liquid cooling and mission‑critical mechanical systems, with the credibility and experience to govern commissioning activity from design review through IST, client demonstration, and handover.

How you will do it

Commissioning Strategy & Technical Leadership

Develop and own the mechanical commissioning strategy for liquid‑cooled data centre products Define commissioning philosophy, test levels (L1–L5), hold points, and acceptance criteria Provide design-for-commissioning input during early design and product development phases Act as final technical authority for mechanical commissioning issues and risk resolution

Systems Scope

Direct‑to‑Chip (DTC) liquid cooling systems Coolant Distribution Units (CDUs) Facility and secondary heat rejection systems (dry coolers, chillers, plate heat exchangers) Pumps, valves, pipework, filtration, water treatment Leak detection and containment systems Integration with IT thermal loads and controls

Procedure & Documentation Development

Author and maintain:Mechanical commissioning plans Pre‑commissioning and flushing procedures Pressure testing and leak testing scripts Thermal performance and load validation test scripts Define measurable pass/fail criteria for all mechanical systems

Site & Regional Team Oversight

Provide governance and technical oversight to regional mechanical commissioning teams Audit commissioning execution for compliance with strategy and standards Witness Factory Acceptance Tests (FAT), Site Acceptance Tests (SAT), and critical onsite tests Support regional teams with complex fault finding and system tuning

Integrated Testing & Handover

Collaborate with electrical and controls leads during:Integrated Systems Testing (IST) Failure‑mode and redundancy testing Support client demonstrations and formal handover Ensure readiness for live IT load introduction

What we look for

10+ years’ experience in mechanical commissioning of mission‑critical facilities Demonstrable experience commissioning liquid‑cooled data centre systems. Strong working knowledge of:Hydronic system design and commissioning Controls and BMS / PLC interaction Redundancy and failure‑mode analysis Experience working across multiple geographies with regional teams Relevant engineering qualification (Mechanical Engineering or equivalent) Calm and authoritative under pressure Strong technical documentation skills Pragmatic, outcome‑focused approach to commissioning Willingness to travel to support FATs and critical site activities Able to challenge unsafe or non‑compliant commissioning practices

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