On-site Data Centre Commissioning Engineer (Denmark)

Hollybank Trustees Ltd; Denmark; On-site; DKK 700,000 - 1,000,000; Full time

Job summary

Hollybank Trustees Ltd. seeks an experienced Commissioning Engineer to deliver mechanical and electrical commissioning on a large-scale data centre project in Denmark.

You will work with the Client's Commissioning Authority (CxA) to ensure systems are fully documented, compliant, and handed over on time. Responsibilities include developing commissioning programmes, reviewing designs, preparing documentation, coordinating vendors, and leading inspections and testing across Level 1–5 processes.

Qualifications

• Degree or diploma in Mechanical, Electrical, or Building Services Engineering.
• Minimum 5 years commissioning experience on large onsite projects.
• Experience with MEP systems and integrated testing.
• Ability to interpret single-line diagrams, P&IDs, and specifications.

Responsibilities

• Develop and maintain the commissioning programme in line with the construction schedule, identifying system boundaries and energisation dates.
• Review design documentation and Employer's Requirements to confirm systems are commissionable and raise queries where not.
• Prepare and issue commissioning documentation for CxA and Client approval.
• Coordinate vendor specialists, subcontractors, temporary services, load banks, and test equipment ahead of each commissioning phase.
• Lead pre-functional inspection and static testing (Level 1–3) to verify installation quality and system integrity.
• Execute and witness functional performance testing (Level 4) and record results and defects.
• Support Integrated Systems Testing (Level 5), including black building tests and thermal load testing.
• Chair commissioning coordination meetings with Client, CxA, design team, and subcontractors.
• Manage system energisation with safe working practices, permits, lock-out/tag-out, and switching schedules.
• Track and close out commissioning issues and drive progress against milestones.
• Own the commissioning documentation set and ensure all test records and certificates are uploaded.
• Verify vendor start-up reports, calibration certificates, and warranty documentation are complete.

Skills

Excel

Technical writing

Coordination

Communication

P&ID reading

Education

Degree/diploma in Mechanical/Electrical/Building Services Engineering

Tools

Commissioning platforms

Job description

Hollybank Trustees Ltd. seeks an experienced Commissioning Engineer to deliver mechanical and electrical commissioning on a large-scale data centre project in Denmark.

You will work with the Client's Commissioning Authority (CxA) to ensure systems are fully documented, compliant, and handed over on time. Responsibilities include developing commissioning programmes, reviewing designs, preparing documentation, coordinating vendors, and leading inspections and testing across Level 1–5 processes.