Mechanical Engineer - Thermal/Refrigeration Systems, Advanced Engineering jobs in United States
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Fluidstack · 21 hours ago

Mechanical Engineer - Thermal/Refrigeration Systems, Advanced Engineering

positionSan Francisco, CA
timeFull-time
remoteOnsite
senioritySenior Level
money$200K/yr - $300K/yr
date5+ years exp

Fluidstack is building the infrastructure for abundant intelligence and is seeking a Mechanical Engineer focused on Thermal/Refrigeration Systems. The role involves owning the thermodynamic design of a chiller platform for AI data centers, requiring expertise in refrigeration cycle optimization and thermal performance.

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

Refrigeration system designThermal modeling toolsVapor compression cyclesASHRAE standardsMechanical Engineering degreeAnalytical skillsLow GWP refrigerantsPE licenseHands-on experience

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

Equity in the form of stock options

Company

Fluidstack

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FluidStack is an AI cloud platform for frontier labs and startups.
dateFounded in 2017
location
London, England, GBR
people-size51-200 employees
web-link
https://www.fluidstack.io

Funding

Current Stage
Growth Stage
Total Funding
unknown
Key Investors
Seedcamp
2025-06-01Undisclosed
2024-10-01Private Equity
2018-02-01Pre Seed

Leadership Team

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Gary Wu
CEO, Co-Founder
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