Controls Software Engineer -- OneMHS

Controls Software Engineer — OneMHS

Location: Atlanta, GA / Seattle, WA /
Travel: Required travel to Seattle, WA for lab and hardware testing
Experience: 7+ years preferred

Job Summary

We are looking for a Controls Software Engineer to support a next-generation material handling controls platform for a large-scale robotics and automation environment.

The engineer will develop and maintain reusable controls software using CODESYS or TwinCAT, IEC 61131-3 Structured Text, Linux-based industrial PCs, Git, and object-oriented programming concepts.

This is a software-focused controls role involving greenfield development, reusable control components, state-machine architecture, debugging, testing, and deployment of controls applications.

Key Responsibilities

• Develop PLC/control software using IEC 61131-3 Structured Text (ST).
• Develop CODESYS V3 function blocks and reusable control components.
• Apply object-oriented programming concepts including interfaces, methods, properties, encapsulation, and reusable software architecture.
• Design control logic using state machines with clear transitions, fault handling, recovery, start/stop, and emergency-stop behavior.
• Develop modular software components that can be reused across multiple material-handling systems.
• Work with Linux-based industrial PCs and controls environments.
• Use Git for source control, branching, code reviews, and collaborative software development.
• Debug and troubleshoot controls applications and determine the root cause of software/hardware behavior.
• Configure and test controls applications based on electrical drawings and system requirements.
• Write and review technical requirements before beginning development.
• Test software on physical automation hardware and troubleshoot issues identified during testing.
• Collaborate with controls, software, electrical, and automation engineers through code reviews and technical discussions.
• Support deployment activities and provide troubleshooting assistance as systems are brought online.

Required Skills

• Strong hands-on experience with Structured Text (ST).
• CODESYS experience OR strong TwinCAT experience.
• Strong PLC/control software development background.
• Experience with Linux in an industrial, embedded, automation, or controls environment.
• Experience using Git and software-development practices such as code reviews and version control.
• Strong understanding of object-oriented programming concepts.
• Experience designing state machines and fault-handling logic.
• Experience developing reusable/modular controls software.
• Strong debugging and problem-solving skills.
• Ability to work with hardware and software together and troubleshoot system-level issues.