Mechanical Engineer, Demand Management

Fluidstack•Austin, TX

9d•$203,000 - $232,000

About The Position

Fluidstack is building civilization-scale infrastructure for AI, focusing on delivering 10 to 100s of GWs of compute faster than anyone else. This involves rethinking every layer of the stack, from acquiring power to designing, building, and operating data centers with teams spanning hardware and software. Speed and scale are key differentiators. The company is looking for individuals who care deeply about this problem space and are driven by extreme ownership, velocity, first principles thinking, and a passion for the frontier of AI. This role specifically focuses on engineering the mechanical side of demand flexibility, developing cooling systems that can handle load fluctuations without thermal risk. It involves modeling thermal inertia and headroom, designing mechanical strategies to turn cooling into a grid asset, and validating these designs through field tests.

Requirements

Engineered mechanical or HVAC systems for data centers or industrial plants.
Modeled thermal systems dynamically, not just at steady state.
Run field validation campaigns and reconciled model to measurement.
Quantify risk in operating terms: degrees, minutes, and margins.
Work jointly with controls engineers as one system team.

Nice To Haves

Liquid cooling.
Dynamic simulation (Modelica, TRNSYS) or CFD.
Thermal storage.
Psychrometrics depth.

Responsibilities

Engineer the mechanical side of demand flexibility: cooling systems that ride through load flex without thermal risk.
Model thermal inertia and headroom: how far and how long the plant can flex, quantified per site.
Design the mechanical strategies, setpoint moves, staging, and storage, that turn cooling into a grid asset.
Validate in the field: instrumented tests proving the models before the fleet runs on them.