# Controls Engineer, PLC Programming

**Company:** [Fluidstack](https://hotfix.jobs/companies/fluidstack)
**Location:** Austin, TX, New York, NY, San Francisco, CA, Seattle, WA
**Role:** Embedded Engineering
**Salary:** $200k – $250k/yr
**Skills:** Plc Programming, Siemens, Codesys, Structured Text, Iec 61131-3, Bacnet, Modbus, Bms, Scada, Hardware-In-The-Loop
**Posted:** 2026-07-06

> Develop and test reusable PLC control programs and sequences of operations for mechanical systems in large-scale AI data centers. Requires hands-on experience programming and wiring PLCs across multiple platforms, validating on real hardware in a lab.

## Job Description

## Role Scope
Develop and test template PLC programs for standard mechanical equipment across data centers, including chiller skids, fan wall units, CRAHs, so one validated program deploys fleetwide.

Write portable code across mixed PLC hardware (Siemens, Codesys, virtualized PLCs).

Develop and tune sequences of operations (SOOs) with controls and mechanical teams, then implement those directly in PLC code.

Install and wire PLCs and sensors in a lab environment to validate programs before live deployment.

Debug programs against real IO and failure conditions on the bench.

## Requirements
- Written and tested PLC programs for mechanical equipment (chillers, air handlers, pumps, or similar) that have run on real hardware.
- Programmed across more than one PLC platform (Siemens, Codesys, or virtualized environments).
- Turned sequences of operations into working PLC code and identified gaps/contradictions in SOOs.
- Wired PLCs, IO, and sensors; traced faults to the physical layer.
- Writes structured, reusable code.
- Tests against failure and edge cases in the lab.

## Nice-to-Haves
- Data center mechanical systems (chiller plants, CRAH/CRAC, fan wall units).
- Structured Text and IEC 61131-3 languages.
- BMS or SCADA integration over BACnet and Modbus.
- Hardware-in-the-loop or virtualized PLC testing.

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