Hybrid Mechanical Design Engineer — Data Center Cooling

OnZero; Helsinki; Hybrid; EUR 70,000 - 95,000; Full time

Benefits offered by this job

Hybrid work & travel flexibility

Flexible working hours

Lunch allowance

Job summary

OnZero is seeking a Design Engineer (Mechanical) to lead mechanical design for data centers, covering direct-to-chip liquid cooling, CDUs, heat rejection, and HVAC for white space and support areas.

You will translate business and operational needs into heat and mass balances, P&IDs, and equipment specs, coordinating with A&E partners and cross‑disciplinary teams through all project phases from site selection to commissioning.

Qualifications

• Bachelor's or Master's in mechanical, energy, or related field.
• Experience designing mechanical/HVAC for data centers or similar facilities.
• Fluent in English; Nordic languages a plus.

Responsibilities

• Produce mechanical design concepts for data center cooling and HVAC systems.
• Prepare heat and mass balances, P&IDs, flow and equipment specifications.
• Review consultant and vendor deliverables and manage non-conformances.
• Coordinate mechanical scope with architecture, civil, electrical and ICT disciplines.
• Support site selection, project management and procurement on feasibility, lead times and quality.
• Ensure designs meet performance, safety and sustainability targets (PUE/WUE).

Skills

English fluency

Technical problem solving

Team collaboration

Communication

Education

Bachelor's or Master's in mechanical/energy

Job description

OnZero is seeking a Design Engineer (Mechanical) to lead mechanical design for data centers, covering direct-to-chip liquid cooling, CDUs, heat rejection, and HVAC for white space and support areas.

You will translate business and operational needs into heat and mass balances, P&IDs, and equipment specs, coordinating with A&E partners and cross‑disciplinary teams through all project phases from site selection to commissioning.