Controls Engineer, Thermofluids

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 weve ever built - but only if models are aligned with what humanity actually wants. There are groups building AI who dont share these goals. Whoever deploys frontier compute infrastructure fastest will decide whether AI expands human freedom or shrinks it.

Were 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 youre going to spend your time spend it on something that matters to the world.

Examples of key problems the team is working on

• Reject 10s of GW of heat starting now. Fluidstack is targeting 10s of GW of compute over the next two years. Every watt of it becomes heat that has to go somewhere and no cooling team has ever been asked to open at that scale rather than grow into it.

• Design and build the machines because nobody can supply them. The merchant compressor market cannot deliver at this rate and the vendor base behind todays chillers will not scale to gigawatts. We are taking compressor and chiller design in house working on machine architectures nobody sells today and going from blank sheet to production faster than this industry thinks is possible.

• Own every thermofluids problem behind the fleet not just the chiller. Working fluid and cycle architecture heat exchangers at a scale that dominates the cost of the plant two-phase heat transfer at the chip and thermal energy storage. All of it is open and whatever this team lands gets built thousands of times.
  

• Own the control architecture for the machine and the test rigs spanning the compressor the motor drive the expansion turbine and the loop around them.

• Write the safety interlocks and fault handling for a machine whose working fluid can cross its critical point inside the normal operating range taking the control problem with it.

• Deliver capacity control through motor and turbine speed rather than throttling valves keeping the process fluid path free of valves at the design point.

• Validate the control system against hardware-in-the-loop before it ever touches the real machine and prove the interlocks fire.

• Carry the controls out of the test cell and into the production chiller including integration with site BMS and the wider plant.

The below is a starting point. We always make space for exceptional people so if you dont fit this role exactly tell us where you would.

• Youve written control logic for rotating machinery and you were in the room the first time it ran.

• Youve designed interlocks where a fault means destroyed hardware or an injured person and you can justify every one of them from first principles.

• Youve run hardware-in-the-loop testing that caught something real before it reached commissioning.

• Youve tuned loops on a live machine and worked out why the model and the plant disagreed.

• Youve handed a control system to people who did not write it with documentation they could actually use at three in the morning.

• Bonus: Propulsion or vehicle test controls (engine sequencing abort and safing logic). Variable-speed drives and high-speed motor control (VFDs magnetic bearing controllers). Refrigeration and chiller control (superheat head pressure capacity staging). Industrial control platforms (Beckhoff Siemens Allen-Bradley CODESYS). Model-based development and HIL (Simulink dSPACE NI VeriStand).

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.

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 with your resume/CV the role youve applied for and the date you submitted your application-- someone from our recruiting team will be in touch.

Required Experience:

IC