Mechanical Commissioning Associate — Toronto, ON

The Position

Mission Critical Engineers is seeking a Mechanical Commissioning Associate to support the field execution of commissioning activities on complex data centre and mission-critical projects.

The Mechanical Commissioning Associate will work alongside the Lead Data Centre Commissioning Engineer & Project Manager and the commissioning team during system startup, test preparation, functional testing, integrated systems testing, and turnover.

Responsibilities

• Support and actively participate in L1–L5 commissioning activities, including factory acceptance testing, site acceptance testing, installation verification, pre-functional testing, functional performance testing, and integrated systems testing.
• Participate in field verification, testing, troubleshooting, and documentation of mechanical systems.
• Assist with commissioning of critical cooling infrastructure, including chillers, cooling towers, pumps, CRAH/CRAC units, air-handling systems, CDUs, liquid-cooling systems, hydronic systems, BMS, controls, alarms, and interlocks.
• Support verification of mechanical-system redundancy, control sequences, alarms, failover, recovery, maintainability, and response to abnormal operating conditions.
• Review mechanical drawings, specifications, submittals, equipment documentation, test procedures, control sequences, and operating manuals.
• Conduct site inspections and verify system installation, test readiness, and completion of pre-functional requirements.
• Assist with development, review, and execution of test plans, test scripts, checklists, test matrices, and acceptance criteria.
• Support testing of BMS points, alarms, monitoring, interlocks, equipment safeties, automatic sequences, and system response.
• Attend commissioning, test-readiness, and technical coordination meetings with owners, contractors, OEMs, consulting engineers, and MCE personnel.
• Maintain accurate test records, site observations, deficiency logs, meeting minutes, and project-status updates.
• Support test-day logistics, including site access, equipment availability, safety controls, temporary loads, required documentation, and OEM attendance.
• Assist in tracking deficiencies, verifying corrective actions, and confirming readiness for subsequent testing stages.
• Support owner training, turnover documentation, and transition of systems to the facility operations team.
• Follow MCE and project safety requirements at all times.
• Work from the Toronto office and project sites as required, with travel to client and project locations across Canada.

Qualifications

• Diploma or bachelor’s degree in Mechanical Engineering, Mechanical Engineering Technology, Building Systems Engineering, or a related discipline.
• Experience in mechanical construction, testing, commissioning, design, operations, maintenance, or related technical work is preferred.
• Foundational understanding of HVAC, hydronic, cooling, controls, and mechanical-system operation.
• Familiarity with redundancy, availability, resiliency, failover, and recovery concepts in mission-critical environments.
• Ability to read and interpret mechanical drawings, P&IDs, control diagrams, specifications, and equipment manuals.
• Strong attention to detail, organization, and technical documentation skills.
• Strong written and oral communication skills, including the ability to prepare clear technical notes, test records, and reports.
• Collaborative, dependable, and professional approach; able to work independently in the field and effectively within a multidisciplinary team.
• Proficiency with Microsoft Office and relevant engineering, analysis, or documentation software.
• Ability to work safely in active construction and mission-critical environments.
• Valid driver’s licence and ability to travel 15–50% as required.

Preferred Qualifications

• Experience in data centres, healthcare, industrial, laboratory, utility, or other mission-critical environments.
• Experience with chilled-water systems, cooling towers, CRAH/CRAC units, air-handling systems, liquid cooling, CDUs, BMS, or data centre cooling infrastructure.
• Familiarity with commissioning processes and L1–L5 testing.
• Eligibility for registration with Professional Engineers Ontario is an asset.

About Mission Critical Engineers

Mission Critical Engineers is an independent Commissioning Authority for data centres and other high-availability infrastructure. We represent owners through design and construction verification, functional and integrated systems testing, and operational handover.

Our work covers the complete critical infrastructure stack: electrical distribution, standby generation, UPS and battery systems, air and liquid cooling, BMS and controls, fire suppression, and life-safety systems.