Power Electronics Engineer

We exist to make humanity more free. For most of human history, you farmed or you starved. Technology gave people more time for the things they wanted to do, instead of things they had to do. Powerful AI will be the biggest lever for human choice we've ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who don't share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it.

We're singularly focused on delivering 10 to 100s of GWs of compute faster than anyone else, rethinking every layer of the stack. We acquire power, design and build data centers, and operate them - with teams spanning hardware and software. Speed and scale are our key differentiators. Come be a part of building civilization-scale infrastructure for AI.

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

• 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.

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.

• Design the SST cell and block in detail: converter implementation, component selection, magnetics interface, and loss and thermal budgets for a 5 MW block on a medium-voltage DC bus.

• Simulate, build and bring up the first cell prototypes with the PCB, firmware and test engineers, and debug them at full voltage and power.

• Turn the program's architecture decisions into a buildable design: schematics, design calculations, and the technical sections of the SST specification.

• Test vendor hardware and data against your own models, and give the program lead the technical evidence behind each make, co-develop or buy call.

• Carry the design through cell, block and pilot-unit design reviews, closing every open loss, thermal and insulation item before the next build.

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 hands-on developed and validated high-power or medium-voltage power converters at the lab bench, going far beyond writing technical requirements.

• You've engineered isolated DC-DC converters utilizing 1.7 kV+ SiC devices and can rigorously justify your efficiency calculations.

• You've guided conversion systems from initial simulation models through hardware bring-up and full qualification testing.

• You've collaborated directly across PCB, controls, and magnetics domains to balance architectural trade-offs across the unit.

• You've identified hardware bugs during bench evaluation and resolved them in subsequent board iterations.

• Bonus: Solid-state transformer products. Resonant converter topologies (DAB, LLC, CLLC). Circuit simulation. SiC voltage derating. Power conversion safety standards.

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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