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. Location: Lahti, Kiveriö About the Role 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. As a Mechanical Engineering Manager, your responsibility is to oversee the mechanical infrastructure and systems of our hyperscale data centres. This role ensures the continuous and efficient operation of mechanical systems and upholds high standards of safety and compliance. You will lead and mentor a team of mechanical engineers and technicians, ensuring the delivery of critical mechanical services 24/7. Your key responsibilities will include Mechanical System Management Oversee the design, installation, operation, and maintenance of mechanical systems within the data centres. Ensure all mechanical infrastructure, including HVAC systems, chillers, and fire suppression systems, operates reliably and efficiently. Implement and maintain mechanical safety policies, procedures, and best practices. Team Leadership Lead, mentor, and develop a team of mechanical engineers and technicians, fostering a culture of excellence and continuous improvement. Coordinate with shift teams to ensure seamless 24/7 coverage and effective handovers between shifts. Conduct regular training sessions and performance evaluations to enhance team capabilities and productivity. Maintenance and Upgrades Plan and oversee preventative and corrective maintenance activities, ensuring all mechanical equipment and systems are serviced according to manufacturer and company standards. Coordinate with vendors and contractors for mechanical maintenance and upgrade projects, ensuring minimal impact on operations. Safety and Compliance Ensure all mechanical operations comply with relevant health, safety, and environmental regulations. Maintain up-to-date documentation and records to support compliance audits and certifications. Technical Support Provide technical expertise and support for mechanical systems, including troubleshooting and resolving complex mechanical issues. Collaborate with other engineering and operations teams to ensure integrated and efficient system performance. Strategic Initiatives Support the Critical Services Manager in developing and implementing strategic initiatives to enhance mechanical system performance and support business growth. Participate in budget planning and cost management activities to ensure operational efficiency and financial performance. Requirements Technical skills Degree in Mechanical Engineering or a related field. Minimum of 7 to 10 years of experience in mechanical engineering, preferably within a data centre or critical infrastructure environment, with at least 3 to 5 years in a managerial role. Strong knowledge of data centre mechanical infrastructure, including HVAC systems, chillers, and fire suppression systems, and the ability to manage complex mechanical challenges. Proven experience in managing technical teams and 24/7 operations. Soft skills Effective communication skills and the ability to work effectively with a multidisciplinary team. Proactive, solutions-oriented mindset with high integrity and a collaborative working style. Ability to work in a fast-paced operational environment. Proficiency in English, both written and spoken. Knowledge of Finnish is a plus. Why Join DayOne? Be a 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. 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. For more information about us, please visit Data Center Company Built For Hyperscale. We Are an Equal Opportunity Employer DayOne is an equal opportunity employer committed to building a diverse and inclusive workplace. We welcome applications from all qualified individuals regardless of race, ethnicity, gender, sexual orientation, age, disability, religion, or any other characteristic protected by applicable law. We believe that diverse perspectives strengthen our team and drive better outcomes for the communities we serve worldwide. 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. DayOne is a data center pioneer that develops and operates next-gen digital infrastructure for industry leaders who demand reliable, cost-effective and quickly scalable solutions. Our cutting-edge facilities empower hyperscalers and large enterprises to achieve rapid deployment and enhance connectivity, driving transformative engagement and innovation as we shape the future of industries. DayOne's data centers are located across key markets, including Singapore, Johor (Malaysia), Batam (Indonesia), Greater Bangkok, Hong Kong SAR, Tokyo, and beyond. Headquartered in Singapore, DayOne’s leadership team draws on over two decades of industry experience and a track record of building Asia's largest data center business. With DayOne, they have created the SIJORI (Singapore, Johor, and Riau Islands) market as a global data center hub. As demand for strategically located and customized data centers rises, DayOne's entrepreneurial spirit, customer-first strategy, deep local partnerships, and agile executional capabilities uniquely position us to power the growth ambitions of leading hyperscalers and large enterprises around the world. We’d love to get to know you! Tell us a bit about your background, experience, and what you're looking for in your next opportunity. The more we know, the better we can match you with roles that fit your goals. Let’s start with: - Your professional background, upload a copy of your latest resume. - Key skills and strengths - Career interests and goals This is your moment — make it count!

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