Senior Thermal Engineer, Expeditionary AI / HPC Data Centers

Job summary

Responsibilities

We are looking for a Senior Thermal Engineer in Costa Mesa, CA to own the thermal management of expeditionary AI/HPC data centers—air-transportable, modular compute and command-and-control infrastructure built to run at forward operating locations.

• Own the thermal design and analysis of deployable data center cooling systems—air-side and water-side cooling, heat rejection, chilled water plant, and liquid cooling—from rack…
• Use first principles to discern the right level of analysis, running hand calcs, spreadsheets, and MATLAB/Python first-order models before detailed design.
• Define cooling architecture and heat-rejection strategy—CRAH/CRAC, air-side economization, chilled water plants, dry coolers, CDUs, rear-door heat exchangers, and direct-to-chip…
• Develop cooling approaches for high-density racks and trade off air, liquid, and hybrid cooling for modular, transportable systems in austere, high-ambient environments.
• Work with electrical, mechanical, and facilities engineers to characterize IT and equipment heat loads across operating and failure modes.

What they're looking for

• MS or higher in mechanical engineering, applied physics, or related field focused on heat transfer, fluid dynamics, and HVAC
• In-depth understanding of heat transfer and fluid dynamics
• 5+ years designing thermal management systems for data centers or comparable mission-critical infrastructure
• Full-spectrum data center thermal experience—air-side and water-side cooling, heat rejection, chilled water plant design, power density management, and liquid cooling
• Steady-state and transient system modeling of thermal management systems, including HVAC and refrigerant simulations

Tech stack

• Python