FluidStack
Controls Engineer, PLC Programming
About this role
Fluidstack seeks a Controls Engineer to develop scalable PLC programs for data center mechanical systems across a 50GW+ deployment. You'll create reusable, portable code across multiple PLC platforms and validate it on real hardware before fleet-wide rollout.
What you'll do
- Design and test template PLC programs for chillers, CRAHs, fan walls, and other mechanical equipment
- Write portable code across Siemens, Codesys, and virtualized PLC platforms
- Convert sequences of operations into functional PLC code with the controls and mechanical teams
- Install and wire PLCs, sensors, and IO in lab environments for pre-deployment validation
- Debug programs against real hardware and failure conditions to catch issues before field deployment
- Build structured, reusable code that other engineers can maintain and adapt
What they're looking for
- PLC programming for mechanical equipment (chillers, air handlers, pumps)
- Multi-platform PLC experience (Siemens, Codesys, virtualized environments)
- Structured Text and IEC 61131-3 languages
- Hardware installation and wiring (PLCs, IO, sensors)
- Fault diagnosis and physical layer troubleshooting
- BACnet and Modbus protocol integration
- Hardware-in-the-loop and virtualized PLC testing
- Data center mechanical systems knowledge
Benefits
- Competitive salary: $200,000–$250,000 annually
- Equity compensation in the form of stock options
- Opportunity to work on civilization-scale AI infrastructure
- Extreme autonomy and end-to-end ownership of projects
- High-velocity, first-principles engineering culture
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FluidStack
FluidStack builds AI infrastructure at scale, developing data centers and warehouse operations designed to handle gigawatt-capacity compute deployment. The company is hiring for warehouse engineers, data center operations specialists, product engineers, and people leaders to support rapid infrastructure expansion across multiple sites.
- Website
- fluidstack.io
Likely interview questions
- Walk us through a time you debugged a PLC program that ran fine in simulation but failed on real hardware—what was the root cause?
- Describe your experience with multiple PLC platforms. How did you approach writing portable code across different vendors?