Fluidstack · 2 hours ago
Mechanical Engineer - Thermal/Refrigeration Systems, Advanced Engineering
San Francisco, CA
Full-time
Onsite
Senior Level
$200K/yr - $300K/yr
5+ years expFluidstack is building the infrastructure for abundant intelligence, partnering with top AI labs and enterprises. The Mechanical Engineer will focus on the thermodynamic design of a direct current air cooled chiller program for AI data centers, optimizing refrigeration cycles and ensuring compliance with industry standards.
Cloud ComputingCloud StorageGenerative AIGPUInformation TechnologyMachine LearningPrivate CloudSoftware
Responsibilities
Lead thermal modeling and simulation of the refrigeration cycle, including compressor staging, superheat / subcooling control, and part load performance optimization
Own the selection and integration of compressors
Design and specify evaporators, condenser coils, and heat exchangers to meet target COP / IPLV specifications
Develop P&IDs with all control loops, safety interlocks, and instrumentation for the refrigeration system
Specify electronic expansion valves, refrigerant piping, and flow control components
Work closely with controls engineering to define control strategies for compressor staging, capacity modulation, and fault handling
Support refrigerant selection and regulatory compliance (R-1234ze(E) for EPA AIM Act compliance)
Lead performance testing and validation, including full-load and part-load testing across operating range
Drive certification efforts including ASHRAE 15, ASME B31.5, and UL 1995 compliance
Qualification
Required
5+ years of experience in refrigeration system design, chiller development, or HVAC equipment engineering
Deep understanding of vapor compression refrigeration cycles, including centrifugal compressor performance characteristics
Experience with thermal modeling tools (EES, CoolPack, or similar) and refrigerant property databases
Hands on experience bringing refrigeration equipment from concept through prototype to production
Familiarity with low GWP refrigerants and evolving refrigerant regulations
Experience with ASHRAE standards (15, 34, 90.1) and UL certification processes
Strong analytical skills and comfort with ambiguity in early-stage product development
BS or MS in Mechanical Engineering or related field
Preferred
Experience with magnetic bearing compressor platforms
Background in data center cooling systems or high density thermal management
Experience with DC powered equipment or variable speed compressor drives
PE license
Benefits
Total compensation may also include equity in the form of stock options.
Company
Fluidstack
FluidStack is an AI cloud platform for frontier labs and startups.
51-200 employees
Funding
Current Stage
Growth StageTotal Funding
unknownKey Investors
Seedcamp
2025-06-01Undisclosed
2024-10-01Private Equity
2018-02-01Pre Seed
Leadership Team
Gary Wu
CEO, Co-Founder
Recent News
2026-01-23
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The Motley Fool
2026-01-16
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