Senior Mechanical Engineer

About DayOne Data Centers

DayOne Data Centers is a Singapore-headquartered global digital infrastructure platform that develops and operates next-generation data centers across Asia Pacific and Europe. Trusted by leading hyperscalers and businesses, the company engineers, builds, and operates high-capacity, AI-ready campuses with speed, scale, and reliability.

DayOne is building its flagship hyperscale data center campus in Lahti, on a former industrial site in Kiveriö. The campus is designed to use Finland's naturally cool climate for free cooling, with air-cooled chillers that remove the need for freshwater cooling. Join the Lahti team early and help shape how a campus of this scale is built, commissioned, and run.

• Assist in the design, installation, operation, and maintenance of mechanical systems within the data centres.
• Ensure all mechanical infrastructure, including HVAC systems, chillers, cooling towers, and fire suppression systems, operates reliably and efficiently.
• Support the implementation and maintenance of mechanical safety policies, procedures, and best practices.

• Perform preventative and corrective maintenance activities, ensuring all mechanical equipment and systems are serviced according to company and manufacturer standards.
• Coordinate with vendors and contractors for mechanical maintenance and upgrade projects, ensuring minimal impact on operations.
• Implement preventive maintenance strategies to minimize downtime.

• Adhere to all relevant health, safety, and environmental regulations, ensuring compliance with industry standards and best practices.
• Participate in safety audits and contribute to the continuous improvement of safety protocols within the data centre.

• Provide technical expertise and support for mechanical systems, including troubleshooting and resolving mechanical issues.
• Collaborate with other engineering and operations teams to ensure integrated and efficient system performance.

• Support the Mechanical Engineering Manager and Critical Services Manager in developing and implementing strategic initiatives to enhance mechanical system performance and support business growth.

• Work closely with other engineers, technicians, and the Mechanical Engineering Manager to ensure seamless 24/7 operations.
• Participate in training and development programs to enhance personal and team capabilities.

• Degree in Mechanical Engineering or a related field.
• 3-5 years of experience in mechanical engineering, preferably within a data centre or critical infrastructure environment.
• Strong knowledge of mechanical infrastructure, including HVAC, chillers, cooling towers, pumps and compressors, nd the ability to resolve complex mechanical challenges.
• Effective communication skills and the ability to work effectively with a multidisciplinary team.
• Proficiency in English, both written and spoken. Knowledge of Finnish is a plus.
• Ability to work in a fast-paced operational environment.
• Proactive, solutions-oriented mindset with high integrity and a collaborative working style.