Key skills
PLC programmingSiemens S7-1200/1500PythonpytestSiemens TIA PortalFunctional testingIntegration testingDefect trackingIndustrial communication protocolsS7 protocolModbus TCP/RTUOPC-UAHardware-in-the-Loop testingSoftware-in-the-Loop testingLadder LogicFunction Block DiagramStructured TextAIPytestUnit TestingAzureAzure DevOpsAgileScrumCommunication
About this role
ON.energy is building the power infrastructure that makes the AI era possible. The Quality Assurance Engineer is responsible for hands-on experience in PLC programming, industrial protocol testing, and Python-based test automation, ensuring the quality and functionality of PLC-based control systems.
Responsibilities:
- Design, develop, and execute Unit tests, functional, integration, and regression test cases for PLC-based control systems
- Write and maintain Python-based automated test scripts for testing PLC I/O, HMI interfaces, and communication protocols
- Develop, review, and validate PLC code (Ladder Logic, Function Block Diagram, Structured Text) across Siemens S7-1200/1500
- Collaborate with controls engineers to define acceptance criteria and validate system requirements
- Identify, document, and track defects using tools such as Azure Devops or equivalent; lead root cause analysis for critical failures
- Conduct Hardware-in-the-Loop (HIL) and Software-in-the-Loop (SIL) testing where applicable
- Produce clear test plans, reports, and traceability matrices aligned with release timelines
Requirements:
- University degree in Software Engineering, Computer Science, Quality Engineering, or a related technical field
- 5+ years of hands-on experience in PLC programming and testing across Siemens platform
- 5+ years of experience building and maintaining automated test frameworks using pytest or equivalent python framework
- 3–5 years of experience with Siemens TIA Portal for PLC development, diagnostics, and commissioning support
- Experience designing and executing functional and integration tests, including test case development, defect tracking, and validation of fixes
- Working knowledge of industrial communication protocols such as S7, Modbus TCP/RTU, and OPC-UA
- Proficiency in automated unit testing the PLC Logic
- Experience with SCADA systems
- Familiarity with Agile / Scrum methodologies in industrial settings
- Knowledge of functional safety standards such as IEC 61508 / IEC 62061