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About the Role
Fluidstack is building civilization-scale infrastructure for AI, focused on delivering 10 to 100s of GWs of compute faster than anyone else. This role is on the Thermofluids R&D Team, which tackles critical problems like rejecting massive amounts of heat and designing custom cooling machinery.
Responsibilities
- Define machine requirements, owning the cycle model that sets working fluid, pressures, temperatures, and flows.
- Design heat exchangers with surface areas in the millions of square meters.
- Design the fluid system, including piping, valves, and headers, sized against pressure-drop budgets.
- Run trade studies to decide machine parameters like air-side temperature rise and face velocity.
- Reconcile cycle predictions with measured COP on the test stand and report discrepancies.
- Own every thermofluids problem behind the fleet, including working fluid and cycle architecture, heat exchangers, two-phase heat transfer at the chip, and thermal energy storage.
Requirements
- Built a thermodynamic cycle model from fluid properties up and defended its assumptions.
- Sized real heat exchangers against published correlations and identified when a correlation was misapplied.
- Calibrated a model against machine datasheet or test data and reported gaps honestly.
- Written analysis that changed a design decision, in a readable format for non-coders.
- Sized a relief path and signed off on system protection.
- Held a result open when it was still open, rather than closing it early.
Skills
- Thermodynamic cycle modeling
- Heat exchanger design
- Fluid system design
- Trade study analysis
- Model calibration
- Data analysis and reporting
- Relief path sizing
- Vapor-compression cycles
- Transcritical cycles
- Propulsion fluid systems
- Cryogenic fluid systems
- Piping design
- Real-gas properties
- Two-phase heat transfer correlations
- Data center thermal architecture
Location
- Remote
Work Type
- Full-time
Experience Level
- Mid-level
- Senior-level
Education Level
- Bachelor's degree
- Master's degree
- PhD
About the Company
- Fluidstack is building civilization-scale infrastructure for AI, focused on delivering 10 to 100s of GWs of compute faster than anyone else.
- The company operates by principles of full autonomy, insane urgency, reasoning from first principles, a love of the game, and building something that matters.
- Teams span hardware and software, with speed and scale as key differentiators.
Equal Opportunity
- Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law.
- Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.