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Fluidstack is building civilization-scale infrastructure for AI, focused on deploying 10s to 100s of GWs of compute faster than anyone else. The company rethinks every layer of the stack—acquiring power, designing and building data centers, and operating them with teams spanning hardware and software.
You will join the mechanical engineering team in Fluidstack's infrastructure R&D group, designing cooling, water, and fire systems inside gigawatt-scale AI data centers as repeatable products rather than one-off site designs. Liquid-cooled compute makes water a primary utility, so make-up water, treatment, condenser and process loops, and drainage all must be sized, specified, and standardized so the same design ships to every site.
Key problems the team is working on include:
- Standardizing domestic, process, and make-up water systems that feed liquid cooling plants so they can be ordered as kits and installed in prefabricated modules
- Sizing water supply, storage, and drainage for cooling loads that swing faster than conventional plumbing design assumes
- Coordinating water treatment, backflow protection, and chemical dosing with controls and water-quality engineers who operate the loops
- Turning field and commissioning findings into design changes that reach the next site
In this role, you will own plumbing design end-to-end: design domestic water, process and make-up water, condenser water piping, drainage, and stormwater systems for data center buildings and prefabricated modules, from concept through construction documents. You'll run hydraulic calculations, select pumps, valves, backflow preventers, water heaters, and storage, and write specifications vendors and contractors build to. You'll keep designs compliant with plumbing, mechanical, and health codes across jurisdictions Fluidstack builds in, and manage permit and inspection questions. You'll integrate with mechanical, water-quality, and controls engineers so make-up water, treatment, and blowdown are designed as one system with the cooling plant. You'll review contractor submittals and shop drawings, answer RFIs, and walk installations through commissioning.
Fluidstack operates with full autonomy—own things end to end, take on scope without being asked. The culture emphasizes insane urgency, reasoning from first principles, and building something that actually matters.
REQUIREMENTS:
- 5+ years of plumbing or piping design engineering on industrial, mission-critical, or large commercial facilities, with at least one project taken through construction documents and commissioning
- Working knowledge of the IPC or UPC, IMC, and local amendments, and of how to get a design through permit review
- Hands-on with hydraulic calculations, pump and pipe sizing, backflow protection, and water storage design
- Fluency in Revit or AutoCAD MEP and a hydraulic modeling tool
- Experience reviewing contractor submittals and answering RFIs, and knowledge of which deviations matter
- Ability to write specifications a contractor can bid without a meeting
- Bonus: Professional Engineer license or CPD certification, data center or liquid-cooling plant experience, water treatment or industrial process piping background
