Controls Engineer, PLC Programming

Fluidstack

$200K — $250K *
Technical Services
Less than 5 years of experience
Job Overview by Ladders

Qualifications

  • 5-7 years of experience writing and testing PLC programs for mechanical systems such as chillers and air handlers.
  • Proficient in multiple PLC platforms, particularly Siemens and Codesys, with an openness to diverse toolchains.
  • Experience translating sequences of operations into operational PLC code, identifying and correcting issues beforehand.
  • Hands-on experience installing, wiring, and troubleshooting PLCs and IO in practical environments.
  • Ability to produce structured, reusable code that simplifies future engineering tasks.
  • Skilled in testing edge cases and failure scenarios to preempt issues during live operations.
  • Bonus: Familiarity with data center mechanical systems, IEC 61131-3 programming languages, and system integrations over BACnet and Modbus.

Responsibilities

  • Develop and validate standardized PLC programs for mechanical equipment across multiple data centers.
  • Create portable code compatible with diverse PLC hardware, necessitating minimal adjustments for implementation.
  • Collaborate with teams to develop and refine sequences of operation, incorporating them into the PLC code directly.
  • Install and wire PLC systems and sensors in a lab setting for program validation prior to field deployment.
  • Conduct program debugging against actual IO conditions to ensure reliability during commissioning.

Benefits

  • Offers equity in the form of stock options.
  • Commitment to pay equity and transparency.
Full Job Description
Role Scope
  • Develop and test template PLC programs for the standard mechanical equipment across every data center, chiller skids, fan wall units, CRAHs, and the rest, so one validated program deploys fleetwide instead of being rebuilt site by site.
  • Write portable code across mixed PLC hardware, Siemens, Codesys, and virtualized PLCs, so a program built once runs regardless of the controller underneath it.
  • Develop and tune sequences of operations with the controls and mechanical teams, then implement those SOOs directly in PLC code.
  • Install and wire PLCs and sensors in a lab environment, standing up real hardware to validate programs before they ever run on live equipment.
  • Debug programs against real IO and failure conditions on the bench so field commissioning becomes a verification step, not a debugging session.
What We're Looking For

The below is a starting point. We always make space for exceptional people, so if you don't fit this role exactly, tell us where you would.
  • You've written and tested PLC programs for mechanical equipment, chillers, air handlers, pumps, or similar, and watched them run on real hardware, not only in simulation.
  • You've programmed across more than one PLC platform, Siemens, Codesys, or virtualized environments, and you don't treat one vendor's toolchain as the boundary of what's possible.
  • You've turned a sequence of operations into working PLC code, and you've caught the gaps and contradictions in an SOO before they reached the controller.
  • You've wired PLCs, IO, and sensors yourself, and you've traced a fault down to the physical layer when a program that looked right on screen misbehaved on the bench.
  • You write structured, reusable code that the next engineer can read, so the templates you build get reused rather than rewritten.
  • You test against failure and edge cases, not just the expected path, and you find the problems in the lab instead of in a running data center.
  • Bonus: Data center mechanical systems (chiller plants, CRAH/CRAC, fan wall units). Structured Text and the IEC 61131-3 languages. BMS or SCADA integration over BACnet and Modbus. Hardware-in-the-loop or virtualized PLC testing.


Compensation: $200,000 - $250,000 per year, depending on experience, skills, qualifications, and location. Offers equity in the form of stock options.

We are committed to pay equity and transparency.

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