Thermodynamics Engineer (AI)

Location: Must be based in or able to work from Austin, Los Angeles, New York, San Francisco, or Seattle (Hybrid)

Compensation: $210,000 – $260,000 + Equity

Company

hirify.global is building civilization-scale compute infrastructure for AI, focusing on rapid deployment of gigawatt-scale data centers through in-house hardware and software innovation.

What you will do

• Define machine specifications and own the cycle model for working fluids, pressures, and temperatures.
• Design massive-scale heat exchangers and fluid systems including piping, valves, and relief paths.
• Run trade studies on air-side temperature rise, face velocity, and subcooling to optimize machine performance.
• Validate cycle predictions on test stands and reconcile models against measured performance data.
• Collaborate across hardware and software teams to scale cooling solutions for 10+ GW compute environments.

Requirements

• Must have US work authorization.
• Proven experience building thermodynamic cycle models from fluid properties.
• Experience sizing real heat exchangers against published correlations.
• Ability to calibrate models against machine datasheets or test data with honest reporting of gaps.
• Experience in relief path sizing and system safety sign-off.
• Strong technical communication skills for documenting design decisions.

Nice to have

• Experience with vapor-compression and transcritical cycles (chillers, heat pumps).
• Background in propulsion or cryogenic fluid systems.
• Familiarity with CoolProp, REFPROP, or specific heat-transfer correlations.
• Knowledge of data center thermal architecture (CDUs, dry coolers, direct-to-chip).

Culture & Benefits

• Full autonomy with end-to-end ownership of projects.
• High-intensity environment focused on solving frontier AI infrastructure problems.
• Equity participation in all full-time roles.
• Commitment to pay equity and transparency.