About Fluidstack

Technology is the most important tool humans have found for improving the human condition, but it is not a default good. It is a lever for ideology.

Today the most powerful technology in history is being built: machines that solve problems better than humans can. The most important mission of our generation is to imbue AI with democratic values: error-correcting institutions, freedom of speech, individual liberties. AI trains and runs on massive compute clusters. Whichever ideology builds the infrastructure the fastest is the ideology that will endure. Democracy is delicate and won't survive this technology by default.

We hire people who care deeply about this problem space. If that is you, please apply!

How We Operate

Be a barrel. Full autonomy. Own things end to end, take on scope without being asked, no permission required to operate outside your core role.
Insane urgency. We drive everything forward as fast as possible.
Reason from first principles. Challenge every assumption. Zero analogy thinking, no egos, the best idea wins.
Love of the game. The frontier of AI is the most interesting problem of our time. We put in long hours at high intensity to push the frontier forward.
Build something that actually matters. If you're going to spend your time, spend it on something that matters to the world.

The Product Engineering Team

Product Engineering builds the power and cooling systems that let Fluidstack deliver gigawatt-scale AI data centers faster and denser than the grid-standard supply chain allows. The SST group is designing solid-state transformers as a core building block of that power architecture.

Examples of key problems the team is working on

Architect a medium-voltage solid-state transformer that can be manufactured, serviced, and scaled across gigawatt-scale campuses, not just demonstrated in a lab.
Define the interface between the SST and the MVDC distribution system, including protection, control boundaries, and fault behavior.
Build a semiconductor and magnetics supply strategy that survives a thin 10kV SiC market over a multi-year horizon.
Take converter hardware from topology selection through working prototypes on a schedule that data center construction actually depends on.

Role Scope

Own protection and grounding for every zone, from a bipolar medium-voltage DC bus carrying hundreds of megawatts over miles to the 1,500 V solar and battery bus and the 800 V racks.
Specify, and where no product exists co-develop with vendors, the DC breakers, fuses, and disconnects for these buses, from medium-voltage feeders to hall buses carrying tens of thousands of amps.
Design fault clearing without conventional breakers where possible, using SSTs that stop switching within microseconds, isolators that open at zero current, and fuses only where paralleled units can backfeed, and prove it in electromagnetic transient studies.
Turn fault studies into requirements every SST, battery converter, and breaker vendor must meet: fault current contribution, interruption time, and coordination settings.
Run live short-circuit and interruption tests on an energized multi-SST bus that prove the design to insurers, lenders, and the authority having jurisdiction.

What We're Looking For

The below is a starting point. We always make space for exceptional people, so if you don't fit this role exactly, tell us where you would.

You've designed protection for a medium- or high-voltage DC system (MVDC, HVDC, shipboard, rail, or DC microgrid) and seen it through commissioning.
You've built and run electromagnetic transient models of converter-dominated systems, and used them to set breaker, fuse, or relay requirements.
You've made a grounding call (solid, resistance, or floating) and defended its trade-off between fault current and insulation stress.
You've specified, designed, or qualified DC breakers, fuses, or switchgear for medium-voltage or high-current DC, and tested them through interruption.
You've written protection requirements a converter or breaker vendor had to redesign to meet.
You find the failure case others missed and can show it in a single simulation plot.
Bonus: DC interruption technology (solid-state and hybrid breakers, high-speed DC fuses). EMT simulation (PSCAD/EMTDC, EMTP, PLECS, MATLAB/Simulink). Protection coordination and relay settings (ANSI device functions, IEC 61850). MVDC standards (IEEE 1709). Professional Engineer license (PE).

We are committed to pay equity and transparency.

Fluidstack is an Equal Employment Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, sexual orientation, gender identity, disability and protected veterans’ status, or any other characteristic protected by law. Fluidstack will consider for employment qualified applicants with arrest and conviction records pursuant to applicable law.

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You will receive a confirmation email once your application has successfully been accepted. If there is an error with your submission and you did not receive a confirmation email, please email careers@fluidstack.io with your resume/CV, the role you've applied for, and the date you submitted your application-- someone from our recruiting team will be in touch.