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Fluidstack is building civilization-scale compute infrastructure for AI at unprecedented speed and scale. The company is targeting 10 GW of compute in 2027 and 30 GW in 2028, requiring rethinking of every layer of the stack from power acquisition through data center design and operation.
The Thermofluids R&D team is solving some of the most challenging infrastructure problems in the industry: rejecting more than 10 gigawatts of heat, designing and building custom compressors and chillers that the merchant market cannot supply, and owning the complete thermofluids problem across the fleet including working fluid cycles, heat exchangers, two-phase heat transfer, and thermal energy storage.
As Power Electronics Engineer, you will own the complete electrical design of the machine's power path, including the DC bus, inverter, motor drive, and amplifiers driving magnetic bearings around the rotor. You will specify and integrate high-speed hermetic motor drives, handling switching, thermal, bearing-current, and insulation challenges. You will design power and protection schemes for test benches and load banks capable of running machines to full rating. You will take the electrical scope through EMC, harmonics, and arc flash analysis to ensure safe installation and sign-off. You will own electrical safety in the test cell, including procedures for technicians and test engineers working around live buses and stored energy.
The role operates with full autonomy and end-to-end ownership. Fluidstack emphasizes insane urgency, first-principles reasoning, and building something that matters. The frontier of AI infrastructure is positioned as the most interesting problem of our time.
REQUIREMENTS:
- You have designed a high-power converter or motor drive that was built, and were present when it first drove a real load.
- You have integrated a drive with a motor designed by someone else, and dealt with the drive's effects on the machine and shared bus.
- You have chased an EMC, harmonic, or bearing-current problem to its actual cause rather than adding a filter.
- You have written electrical safe work practices and enforced them on people who found them inconvenient.
- You have powered up a test cell or first-of-a-kind installation and made the decision to close the breaker safely.
- Bonus experience: high-speed and magnetic-bearing drive systems, electric propulsion and aerospace power systems (eVTOL, satellite EPS, electric pump-fed engines), 800 V class DC architectures, wide-bandgap devices (SiC, GaN), test cell power, and safe practices around energized work.
