FluidStack
Fluids / Mechanical Engineer, R&D
About this role
Fluidstack is seeking a Fluids/Mechanical Engineer to lead R&D on unprecedented-scale data center cooling systems. You'll design thermodynamic cycles, heat exchangers, and fluid systems that reject gigawatts of heat, developing machine architectures from scratch and translating models into production hardware.
What you'll do
- Develop thermodynamic cycle models defining working fluid, pressures, temperatures, and flows for compressors, turbines, and heat exchangers
- Design large-scale heat exchangers and fluid distribution systems optimized for minimal footprint and pressure drop
- Conduct engineering trades on machine operating points (air-side temperature rise, face velocity, subcooling) using coupled exchanger ratings
- Validate cycle predictions on test stands, reconcile models against measured COP, and document model gaps honestly
- Size relief and isolation systems, taking responsibility for system safety and protection
- Author analyses that drive design decisions in forms accessible to non-technical stakeholders
What they're looking for
- Thermodynamic cycle modeling and analysis
- Heat exchanger design and thermal correlations
- HVAC/refrigeration systems and working fluid properties
- Mechanical system design (piping, valves, headers, relief systems)
- Experimental data reconciliation and model validation
- Technical writing and engineering communication
- Computational tools (MATLAB, Python, or equivalent)
- First-principles problem-solving and design trade-off analysis
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FluidStack
FluidStack builds AI infrastructure at scale, developing data centers and warehouse operations designed to handle gigawatt-capacity compute deployment. The company is hiring for warehouse engineers, data center operations specialists, product engineers, and people leaders to support rapid infrastructure expansion across multiple sites.
- Website
- fluidstack.io
Likely interview questions
- Walk us through a thermodynamic cycle model you built from first principles—what assumptions did you challenge and how did you validate them?
- Tell us about a time you caught a mismatch between heat exchanger correlations and your actual geometry. How did you discover and fix it?