Commissioning Lead (Mechanical)

Johnson Controls; Dublin; On-site; EUR 70,000 - 100,000; Full time

Job summary

Johnson Controls is seeking a Senior Mechanical Commissioning Engineer in Dublin, responsible for leading the commissioning strategy for liquid-cooled mechanical systems in data center deployments. The ideal candidate will have over 10 years of experience in mechanical commissioning, particularly within mission-critical facilities. Responsibilities include developing commissioning methodologies, technical oversight across regional teams, and authoring necessary documentation. A relevant engineering qualification is essential along with strong technical skills and the ability to work under pressure.

Qualifications

• 10+ years’ experience in mechanical commissioning of mission-critical facilities.
• Experience commissioning liquid-cooled data centre systems.
• Strong technical documentation skills.

Responsibilities

• Own the mechanical commissioning strategy for liquid-cooled data centre products.
• Govern and provide oversight for regional mechanical commissioning teams.
• Author and maintain mechanical commissioning plans and procedures.

Skills

Mechanical commissioning experience

Liquid-cooled data centre systems

Hydronic system design

Controls and BMS / PLC interaction

Failure-mode analysis

Education

Relevant engineering qualification (Mechanical Engineering or equivalent)

Job description

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 standardsWitness 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