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Senior Controls Software Engineer - CODESYS / TwinCAT

Location: Redmond, WA
Work Model: Hybrid
Experience: 5+ Years

Job Overview

We are seeking a Senior Controls Software Engineer to develop scalable software for advanced industrial automation and material-handling systems.

The ideal candidate will have strong hands-on experience with CODESYS V3 or Beckhoff TwinCAT, IEC 61131-3 Structured Text, state-machine programming, and industrial hardware integration.

Key ResponsibilitiesDevelop machine-control software using CODESYS V3 or Beckhoff TwinCAT.Program reusable Function Blocks and libraries using Structured Text.Develop CASE-based state machines for machine sequencing and equipment control.Apply object-oriented programming principles to PLC software.Integrate motors, drives, sensors, actuators, photo-eyes, and other automation devices.Configure and troubleshoot EtherCAT networks.Develop fault detection, recovery, startup, shutdown, and equipment-state logic.Test and debug control applications using real industrial hardware.Read electrical schematics and control drawings.Support application deployment and commissioning.Participate in Git-based development and code reviews.Required QualificationsBachelor's degree in Engineering, Computer Science, Mechatronics, or related field.5+ years of industrial automation or controls software experience.Hands-on CODESYS V3 or Beckhoff TwinCAT experience.Strong IEC 61131-3 Structured Text skills.Experience with state-machine architecture and CASE statements.Experience developing reusable Function Blocks.Understanding of PLC object-oriented programming.Experience with EtherCAT and industrial hardware.Experience with Git and software development practices.PreferredConveyor or material-handling experience.Warehouse or packaging automation.IO-Link experience.Linux-based Industrial PCs.JSON configuration.Experience with commissioning and deployment.C++ or Rust exposure.

GCS is acting as an Employment Business in relation to this vacancy.

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