Senior Thermofluids Engineer — AI Compute Cooling

Fluidstack; Los Angeles (CA); Hybrid; USD 210,000 - 260,000; Full time

Job summary

Fluidstack in Austin, TX is seeking a senior thermofluids engineer to define machine cycles, design advanced heat exchangers, and develop high‑pressure fluid systems for next‑generation data center cooling.

You will own cycle models, validate against test data, and collaborate across hardware and software teams. 10+ years in thermofluids, strong analytical skills, and willingness to travel ~25% are required.

Qualifications

• 10+ years of experience in thermofluids engineering.
• Built a thermodynamic cycle model from fluid properties and defended its assumptions.
• Sized heat exchangers using published correlations and real data.

Responsibilities

• Define the machine requirements and cycle model for working fluid, pressures, temperatures and flows.
• Design heat exchangers with very large surface areas as a major footprint driver for the data center.
• Design the fluid system including piping, valves, headers, relief and isolation components.
• Run trades to optimize air-side temperature rise, velocity and subcooling while validating against model predictions.
• Take cycle predictions to test stands and reconcile with measured COP.

Skills

Thermofluids engineering

Thermodynamic cycle modeling

Heat exchanger design

High‑pressure fluid systems

Modeling from fluid properties

Tools

CoolProp

REFPROP

Cavallini

Gnielinski

Wang

Job description

Fluidstack in Austin, TX is seeking a senior thermofluids engineer to define machine cycles, design advanced heat exchangers, and develop high‑pressure fluid systems for next‑generation data center cooling.

You will own cycle models, validate against test data, and collaborate across hardware and software teams. 10+ years in thermofluids, strong analytical skills, and willingness to travel ~25% are required.