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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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Senior Automation Software Engineer - PLC / CODESYS

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

Position Summary

We are looking for a Senior Automation Software Engineer with a strong background in PLC and machine-control software development.

This engineer will build modular, reusable control applications for automated equipment and high-throughput material-handling systems. The position combines software engineering with industrial controls, making it ideal for someone who enjoys developing software while working directly with physical automation hardware.

ResponsibilitiesDesign and develop control applications using CODESYS V3 or Beckhoff TwinCAT.Develop production-quality Structured Text programs following IEC 61131-3 standards.Create modular Function Blocks and reusable software libraries.Design machine sequencing using state machines and CASE-based logic.Implement fault handling, recovery, startup/shutdown, and equipment-state management.Apply OOP concepts such as interfaces, methods, properties, abstraction, and encapsulation.Integrate and troubleshoot motors, drives, sensors, actuators, MDRs, and IO-Link devices.Configure and troubleshoot EtherCAT communication.Validate software with real automation equipment.Review electrical schematics and control-panel documentation.Support commissioning and system deployment.Participate in design reviews, code reviews, and Agile development activities.Required Skills5+ years of controls, PLC, or industrial automation software development.CODESYS V3 or Beckhoff TwinCAT experience.Strong Structured Text / IEC 61131-3 experience.State-machine programming experience.Object-oriented PLC development.EtherCAT experience.Industrial hardware integration and troubleshooting.Git/source-control experience.Strong analytical and problem-solving skills.Preferred ExperienceMaterial handlingConveyor systemsSortation systemsWarehouse automationPackaging automationIO-LinkLinux Industrial PCsJSON configurationElectrical schematicsC++ or Rust

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

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Senior Controls Engineer - Industrial Automation Software

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

About the Role

We are hiring a Senior Controls Engineer with strong software development experience to support advanced automated material-handling and machine-control systems.

The successful candidate will develop reusable PLC software and integrate control applications with real-world industrial equipment. Strong experience with Beckhoff TwinCAT or CODESYS, Structured Text, EtherCAT, and state-machine design is highly valued.

What You'll DoDevelop and maintain PLC/control software using CODESYS V3 or Beckhoff TwinCAT.Write structured, reusable IEC 61131-3 Structured Text code.Build reusable Function Blocks and control libraries.Develop state-machine-based machine sequences.Implement equipment startup, shutdown, fault, recovery, and safety logic.Apply object-oriented design principles to control software.Integrate motors, drives, sensors, photo-eyes, actuators, and other field devices.Configure and troubleshoot EtherCAT networks.Test control software in engineering and lab environments.Analyze electrical schematics and control drawings.Troubleshoot hardware/software integration issues.Support commissioning and deployment activities.Work with Git and modern software-development practices.Required QualificationsBachelor's degree in Controls, Electrical, Computer, Mechanical, Mechatronics Engineering, Computer Science, or related discipline.5+ years of industrial controls or automation software experience.CODESYS V3 or Beckhoff TwinCAT.Strong IEC 61131-3 Structured Text programming.State-machine and CASE-statement programming experience.PLC Function Block development.Object-oriented programming concepts.EtherCAT communication experience.Industrial automation hardware integration.Ability to read electrical schematics.Experience with Git/source control.Preferred QualificationsConveyor and sortation systems.Material-handling or warehouse automation.High-speed automation.IO-Link.Linux Industrial PCs.JSON configuration.Commissioning experience.C++ or Rust experience.

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

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Controls Automation Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logic is nice to haveHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)

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

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Automation Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logic is nice to haveHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)ResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

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

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Software Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logic is nice to haveHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)ResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

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

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Automation Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logic is nice to haveHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)ResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

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

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Automation Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logic is nice to haveHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)ResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

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

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Controls Engineer

Location: Seattle/Bellevue, WA (Hybrid)

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logicHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)Nice to HaveExperience with CODESYS V3Material handling, conveyor, sortation, or warehouse automation experienceIO-Link integration experienceJSON/configuration-driven applicationsHMI/SCADA development and commissioning experienceResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

Ideal Candidate: A hands-on Controls Engineer with strong PLC and Structured Text experience, industrial hardware integration expertise, and a passion for building scalable automation systems.

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

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Controls Engineer

Our client is seeking a Controls Engineer to support the development of next-generation material handling and conveyance control systems. This role involves designing and developing machine control software, integrating industrial hardware, and supporting deployment of large-scale automation solutions.

Key Requirements5+ years of experience in industrial automation, controls engineering, or machine control developmentStrong PLC programming experience using IEC 61131-3 Structured TextExperience with Beckhoff TwinCAT, Allen-Bradley, Siemens, or similar PLC platformsProven experience developing state-machine based control logicHands-on experience integrating motors, drives, sensors, actuators, and industrial networksExperience with EtherCAT, EtherNet/IP, Profinet, or ModbusAbility to read electrical schematics and control drawingsFamiliarity with Linux-based industrial systems and version control tools (Git)Nice to HaveExperience with CODESYS V3Material handling, conveyor, sortation, or warehouse automation experienceIO-Link integration experienceJSON/configuration-driven applicationsHMI/SCADA development and commissioning experienceResponsibilitiesDevelop and maintain machine control softwareDesign reusable control modules and automation solutionsIntegrate and validate hardware in lab and production environmentsTroubleshoot control systems and industrial networksParticipate in requirements gathering, code reviews, testing, and deployment activities

Ideal Candidate: A hands-on Controls Engineer with strong PLC and Structured Text experience, industrial hardware integration expertise, and a passion for building scalable automation systems.

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

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