Company Overview STACK Infrastructure builds, owns, and operates hyperscale and colocation data centres that power the world’s most ambitious technology companies. With a rapidly expanding footprint across APAC, STACK combines deep development expertise, flexible capital and operational discipline to deliver critical digital infrastructure at scale. Company Overview STACK Infrastructure builds, owns, and operates hyperscale and colocation data centres that power the world’s most ambitious technology companies. With a rapidly expanding footprint across APAC, STACK combines deep development expertise, flexible capital and operational discipline to deliver critical digital infrastructure at scale. Our clients include the largest hyperscale cloud platforms. We are building a regional platform defined by speed of delivery, power reliability and long-term partnership — and we are assembling the team to lead that effort. Summary/Objective The Critical Operations Supervisor
- Mechanical provides day-to-day operational leadership and technical governance to ensure the safe, compliant and reliable performance of all mechanical and cooling infrastructure across the site. This Monday-Friday role is accountable for coordinating mechanical operations, overseeing major works and maintaining regulatory and contractual compliance. The position participates in a rotating on-call roster to provide after-hours escalation, ensuring timely response to mechanical, thermal or cooling-related incidents. The Supervisor leads the Mechanical workstream across all shift teams, providing expert escalation on complex issues and coordinating critical activities such as planned shutdowns, cooling plant maintenance, thermal risk mitigation, troubleshooting and return-to-service (RTS) validation.



This role is also responsible for ensuring mechanical training, competency and authorisation requirements are met. The Supervisor partners closely with site stakeholders to uplift procedures, enhance plant performance, strengthen operational readiness and continuously improve the mechanical reliability of the facility. This role directly supports STACK’s commitment to 100% uptime and a concierge-level customer service experience, ensuring risk is proactively managed, planned works are executed safely and customer communications are clear, timely and qualified. Essential Functions Reasonable accommodations may be made to enable individuals with disabilities to perform these essential functions.
- Uphold STACK’s 100% uptime objective by providing disciplined operational leadership and oversight of site mechanical and cooling systems.
- Ensure safe and compliant operation of all mechanical systems, including chilled water systems, CRAC/CRAH units, cooling towers, pumps, valves, filtration equipment and associated controls.
- Maintain real-time situational awareness of mechanical system condition, thermal stability, redundancy state and risk indicators through BMS/EPMS and field verification.
- Act as the primary mechanical escalation point for shift teams, providing real-time guidance, diagnostic support and risk evaluation.
- Lead the development, review and implementation of operational and maintenance procedures,



including MOPs and SOPs for mechanical systems.
- Coordinate major mechanical activities, including planned shutdowns, incident response, corrective maintenance, onsite troubleshooting and programmed maintenance.
- Provide technical direction during planned maintenance, resets, cooling plant adjustments, valve alignments and energisations to ensure safe execution aligned to site procedures.
- Review and provide input into risk assessments, method statements, permit-to-work controls, isolations/LOTO and return-to-service documentation.
- Verify operational readiness following maintenance, resets, parameter changes or commissioning activities by confirming alarms, redundancy status, thermal performance and control sequences.
- Ensure all operational activities are carried out with due regard to health and safety, business risk and STACK’s 100% uptime objective.
- Act as incident manager for mechanical incidents when required, including during on-call periods.
- Coordinate vendor activities affecting mechanical systems, ensuring safe execution, alignment to site requirements and correct post-work configuration.
- Identify systemic risks, recurring thermal issues, capacity constraints and mechanical design limitations, and elevate as required.
- Improve operational documentation, including SOPs, MOPs, EOPs, shift logs, CMMS data quality, handover standards and alarm-handling procedures within the mechanical workstream. People
- Model outstanding safety behaviour, operational discipline and professional conduct.
- Provide coaching, uplift and technical mentoring to Senior Data Centre Specialists, Senior Critical Operations Technicians and Critical Operations Technicians to strengthen team capability and execution c

📌 Critical Operations Supervisor (Melbourne)
🏢 Stack Infrastructure
📍 Melbourne