Critical Operations Supervisor - MECHANICAL (Australia)

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. The Supervisor leads the Mechanical workstream across all shift teams and partners closely with site stakeholders to uplift procedures, enhance plant performance, strengthen operational readiness and continuously improve the mechanical reliability of the facility.

Responsibilities

Provide day-to-day operational leadership and technical governance for mechanical and cooling infrastructure; Ensure safe and compliant operation of chilled water systems, CRAC/CRAH units, cooling towers, pumps, valves, filtration equipment and associated controls; Maintain real-time situational awareness of mechanical system condition through BMS/EPMS and field verification; Act as primary mechanical escalation point and incident manager for shift teams, including during on-call periods; Lead development, review and implementation of MOPs and SOPs for mechanical systems; Coordinate planned shutdowns, corrective maintenance, troubleshooting, programmed maintenance and return-to-service (RTS) validation; Review risk assessments, method statements, permit-to-work controls, isolations/LOTO and return-to-service documentation; Coordinate vendor activities affecting mechanical systems; Identify systemic risks, recurring thermal issues and capacity constraints; Improve operational documentation including SOPs, MOPs, EOPs, shift logs, CMMS data quality and handover standards; Provide coaching and technical mentoring to Senior Data Centre Specialists, Senior Critical Operations Technicians and Critical Operations Technicians; Ensure clear shift communication and handovers; Support onboarding of new team members; Represent Critical Operations during customer visits, tours, audits and technical discussions

Requirements

Legal entitlement to work in Australia; Ability to satisfy pre-employment screening requirements, as applicable, including right-to-work checks, background checks and reference checks; Ability to meet data centre security requirements, including badging, access control and adherence to customer-mandated security protocols; Completion of STACK onboarding and required safety/compliance training; Ability to meet site authorisation requirements for system operation and system access; Physical capability to perform inspections, rounds and emergency response tasks; Ongoing compliance with STACK policies, procedures and behavioural standards; Participation in rotating on-call roster and emergency response, readiness exercises and incident management activities

Nice to have

Mechanical trade qualification, such as Certificate III/IV in Mechanical, HVAC or Refrigeration, or a mechanical engineering qualification with suitable Australian recognition or registration; Extensive experience in data centres or other mission-critical facilities, including utilities, hospitals, Defence or industrial environments; Demonstrated expertise operating and monitoring critical cooling and mechanical systems, including CRAC/CRAH, chilled water systems, pumps, cooling towers, airflow and filtration systems; Strong background in inspecting, triaging and stabilising mechanical plant under abnormal conditions; Experience reviewing MOPs, SOPs, EOPs, risk assessments and commissioning documentation; Ability to interpret mechanical schematics, chilled water diagrams, airflow layouts, control logic and OEM manuals; Knowledge of permit-to-work processes, isolations/LOTO and operational risk frameworks; Strong written and verbal communication for technical reporting, incident updates and customer briefings