Controls Engineer, PLC Programming

Fluidstack • Austin, TX

2d • $200,000 - $250,000 • Remote

About The Position

Fluidstack is seeking a Controls Engineer with PLC Programming expertise to join their Controls Team. This role is crucial in developing and deploying controls for over 50GW of data centers this decade. The team focuses on real-time load control, MEP and behind-the-meter integration, automating commissioning, and driving autonomous robotic deployment. The company is dedicated to building civilization-scale infrastructure for AI and values extreme ownership, velocity, first principles thinking, and a passion for the problem space. They operate with long hours at high intensity to push the frontier forward.

Requirements

• Experience writing and testing PLC programs for mechanical equipment such as chillers, air handlers, or pumps, with demonstrated success on real hardware (not just simulation).
• Proficiency in programming across multiple PLC platforms, including Siemens, Codesys, or virtualized environments.
• Experience translating sequences of operations into working PLC code and identifying gaps or contradictions in SOOs before controller implementation.
• Hands-on experience wiring PLCs, I/O, and sensors, including troubleshooting faults down to the physical layer.
• Ability to write structured, reusable code that is easily readable by other engineers.
• Experience testing against failure and edge cases, not just expected paths, and identifying problems in a lab setting.

Nice To Haves

• Experience with data center mechanical systems (chiller plants, CRAH/CRAC, fan wall units).
• Familiarity with Structured Text and IEC 61131-3 languages.
• Experience with BMS or SCADA integration over BACnet and Modbus.
• Experience with Hardware-in-the-loop or virtualized PLC testing.

Responsibilities

• Develop and test template PLC programs for standard mechanical equipment across data centers, including chiller skids, fan wall units, and CRAHs, ensuring fleetwide deployment of validated programs.
• Write portable code compatible with mixed PLC hardware (Siemens, Codesys, virtualized PLCs) to ensure programs run regardless of the controller.
• Develop and tune sequences of operations in collaboration with controls and mechanical teams, implementing them directly in PLC code.
• Install and wire PLCs and sensors in a lab environment, setting up real hardware to validate programs before live deployment.
• Debug programs against real I/O and failure conditions on the bench to streamline field commissioning.

Benefits

• Compensation: $200,000 - $250,000 per year, depending on experience, skills, qualifications, and location.
• Equity in the form of stock options.
• Commitment to pay equity and transparency.
• Equal Employment Opportunity Employer status.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed