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. 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 Building Management System Engineer, you will be responsible for ensuring the efficient operation, maintenance, and optimization of the building management systems across our data center facilities. You will monitor system performance, support upgrades and integrations, and help ensure reliable environmental conditions within a mission-critical environment. Your key responsibilities will include, System Maintenance and Optimization Performing regular maintenance and troubleshooting of BMS hardware and software. Optimizing system performance to ensure energy efficiency and reliability. Monitoring and adjusting BMS parameters to maintain optimal environmental conditions. Data Analysis and Reporting Analyzing BMS data to identify trends, inefficiencies, and potential issues. Generating reports on system performance, energy usage, and maintenance activities. Providing actionable recommendations based on system data analysis. Project Management Leading BMS upgrade and expansion projects while minimizing operational disruption. Coordinating with contractors, vendors, and other stakeholders to ensure successful project delivery. Developing and managing project plans, timelines, and budgets. Compliance and Safety Ensuring BMS operations comply with applicable regulations, standards, and industry best practices. Conducting regular audits and inspections to verify system integrity and safety. Implementing and maintaining safety protocols and procedures. Technical Support and Training Providing technical support to operations teams and other stakeholders. Developing and delivering training on BMS operation and maintenance. Keeping up to date with emerging BMS technologies and industry developments. System Integration Integrating BMS platforms with other building systems and data center infrastructure. Collaborating with IT and facilities teams to ensure seamless interoperability. Managing and troubleshooting integration issues. Requirements Technical skills Degree in Electrical Engineering, Mechanical Engineering, or a related field. 3–5 years of experience in BMS engineering, preferably within a data center or other critical infrastructure environment. Strong proficiency with BMS-related software and technologies. Relevant certifications such as BMS, HVAC, or PMP are considered highly desirable. Excellent analytical skills and experience working with operational data and performance analysis. Soft skills Effective and clear communication skills and the ability to work 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 considered a benefit. 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. 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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