Mechanical Design Manager

Join DayOne – Shaping the Future of Data Infrastructure

DayOne is a global leader in the development and operation of high-performance data centers. As one of the fastest-growing companies in the industry, we’ve built a robust presence across Asia and Europe — and we’re just getting started.

As we expand into new international markets, we’re looking for talented, driven individuals to join us on this exciting journey. This is more than a job — it’s an opportunity to be a key contributor to our dynamic team and help shape the future of global data infrastructure.

If you're passionate about innovation, technology, and growth, we invite you to be part of DayOne’s next chapter.

What You’ll Do As a Mechanical Design Manager, you are responsible for leading the mechanical design of mission-critical data center projects across Europe, including HVAC, plumbing, drainage, and related building mechanical systems. You will ensure mechanical systems are reliable, scalable, maintainable, energy-efficient, and well-integrated with the wider data center infrastructure.

You will work closely with internal teams, local consultants, contractors, vendors, authorities, and operations stakeholders to deliver coordinated, compliant, and high-quality design solutions. You’ll play a key role in ensuring DayOne’s electrical infrastructure meets company standards, applicable European and local regulations, authority requirements, industry best practice and end-user expectations

The key responsibilities include,

• Mechanical Design Oversight: Leading the mechanical design process for data center projects, including HVAC, plumbing, drainage, and related systems.
• Cooling and Thermal Performance: Overseeing cooling architecture, heat rejection, chilled water systems, airflow management, redundancy, energy efficiency, and maintainability.
• Multidisciplinary Coordination: Coordinating mechanical interfaces with electrical, architectural, civil, structural, fire protection, ELV, controls, operations, consultants, contractors, vendors, and project stakeholders.
• Technical Leadership: Providing technical guidance to ensure mechanical solutions are reliable, scalable, efficient, maintainable, and aligned with project and operational needs.
• Design Review and Quality Assurance: Reviewing drawings, specifications, calculations, equipment schedules, technical proposals, and design documents for completeness, accuracy, coordination, constructability, and maintainability.
• Standards and Compliance: Ensuring designs comply with DayOne standards, industry standards, local regulations, authority requirements, sustainability targets, and end-user requirements.
• Vendor and Supplier Coordination: Reviewing mechanical equipment, systems, materials, and technologies against project needs, reliability, energy performance, maintainability, and lifecycle expectations.
• Risk and Issue Resolution: Identifying risks, resolving technical issues, and supporting decisions related to design, constructability, installation, commissioning, handover, and operational readiness.

What We’re Looking For

• Degree in Engineering
• Experience in mechanical, HVAC, cooling, hydronic, or building services design preferably in hyperscale, colocation, cloud infrastructure, or other mission-critical data center environments
• Expertise and strong understanding of mechanical systems for data centers including HVAC, cooling infrastructure, chilled water, hydronic networks, heat rejection, airflow management, ventilation, plumbing, drainage, and thermal performance.
• Experience with mechanical equipment selection, specifications, calculations, design reviews, technical documentation, and coordination of complex design workstreams.
• Good knowledge of mechanical, HVAC, building services, sustainability, energy efficiency, PUE, reliability, redundancy, maintainability, local regulations, and authority requirements.
• Strong analytical and problem-solving abilities, with a proven track record of addressing and resolving technical challenges.
• Previous experience working in fast growing, international environments.
• Ability to work on-site and travel as needed.
• Excellent verbal and written communication skills in English. Finnish or other languages are considered an asset.

Why join DayOne?

• Be part of a company scaling fast in a booming industry.
• Work on an international stage with global leaders.
• Shape your career in a culture that values curiosity, agility, and bold thinking.

DayOne is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

If you're ready to grow with one of the fastest-moving companies in the data center industry, apply now and be part of our global journey.