Mechanical Engineer - Thermal

Mitrex is the world's largest manufacturer of Building-Integrated Photovoltaics (BIPV). From our state-of-the-art Toronto facility, we manufacture solar facades, cladding, railings, roof panels, and noise barriers that turn building envelopes into clean energy generators. Our projects range from healthcare and education campuses to high-rise residential and infrastructure. We deliver to general contractors as a supply partner and, on select projects, as a supply-and-install partner.

We are building modular, prefabricated data center capacity, and thermal performance is at the heart of the product. We're looking for a Mechanical Engineer – Thermal to own the thermal architecture of our modules — from heat capture at the rack to heat rejection or, better, heat reuse. You will design and optimize cooling systems for high-density compute while developing heat recovery solutions that turn waste heat into a valuable output: district heating, or on-site reuse.

This role blends rigorous thermal engineering with product thinking — everything you design must be manufacturable in a factory, shippable, and repeatable across deployments.

• Own the thermal design of our modular data center units — heat load modeling, cooling system design (air and liquid, including direct-to-chip and/or immersion where applicable), airflow/CFD analysis, and PUE optimization.
• Design for N+1 or other redundancy in cooling paths and define failure-mode behavior for the thermal system.
• Select refrigerants and working fluids with attention to efficiency, low-GWP/regulatory compliance, and long-term availability.

• Design heat recovery systems: heat exchangers, heat pump integration for temperature lifting, and connections to reuse pathways such as district heating, greenhouses, or industrial processes.
• Evaluate temperature-lift vs. COP tradeoffs to size heat pump equipment appropriately for each reuse pathway.
• Assess the economics of heat recovery per deployment — how much heat, at what temperature, and what it's worth.
• Define a standard heat-export interface so recovery can be added or omitted per site without redesign.
• Specify materials and water treatment strategy suited to variable return-fluid conditions across different reuse applications.

• Produce mechanical deliverables (P&IDs, equipment schedules, piping layouts) for factory fabrication, and support factory acceptance testing and site commissioning.
• Coordinate thermal control sequences and setpoints with the controls/BMS integration team to ensure cooling behavior is properly monitored and actuated.
• Ensure compliance with applicable codes and standards (ASHRAE, ASME B31/BPVC, CSA/UL, local mechanical codes), including refrigerant handling regulations, and drive design improvements across module generations.

• Bachelor's degree in Mechanical Engineering.
• 5+ years in HVAC/thermal systems design for data centers, mission-critical facilities, or industrial process cooling.
• Strong fundamentals in heat transfer, fluid mechanics, and thermodynamics, with demonstrated application to real systems — not just analysis.
• Hands-on experience designing hydronic systems: heat exchangers, pumps, valves, piping networks, glycol systems, and water treatment considerations.
• Experience with at least one of: liquid cooling for high-density IT, heat recovery/heat pump systems, or district energy.
• Proficiency with thermal/hydraulic modeling tools (e.g., HAP, TRACE, IES, Energy Plus, or equivalent) and CFD tools (e.g., 6
  
  Sigma Room, Ansys, or similar).
• Ability to produce and review P&IDs, mechanical schematics, and construction-grade documentation.
• Willingness to travel (approx. [20–40]%) to fabrication facilities and deployment sites.

• Direct experience with waste heat recovery from data centers — heat pump temperature lifting, district heating interconnection, or ERF/heat reuse reporting under frameworks like the EU Energy Efficiency Directive.
• Experience with direct-to-chip liquid cooling and CDU design for AI/HPC densities (50–150+ kW/rack).
• Familiarity with thermal storage design (sensible or latent) and demand-side flexibility.
• Experience in a factory-built or modular construction environment.
• Knowledge of refrigerant regulations and low-GWP refrigerant selection (heat pump applications).

• Competitive salary based on experience
• Performance bonus
• Extended health and dental benefits
• RRSP program
• The opportunity to work on first-of-their-kind clean energy projects across North America
• A modern, automated manufacturing facility in Etobicoke

Mitrex is an equal-opportunity employer that welcomes all candidates from diverse backgrounds . Accommodations are available upon request for candidates participating in all aspects of the selection process.