Quality Assurance Engineer

Responsibilities

• Design, develop, and execute Unit, 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
• Conduct Hardware-in-the-Loop (HIL) and Software-in-the-Loop (SIL) testing
• Produce clear test plans, reports, and traceability matrices

Requirements

• University degree in Software Engineering, Computer Science, Quality Engineering, or related field
• 5+ years of hands-on experience in PLC programming and testing on Siemens platforms
• 5+ years of experience building automated test frameworks using pytest or equivalent Python frameworks
• 3–5 years of experience with Siemens TIA Portal
• Experience with functional and integration tests, defect tracking, and validation
• Working knowledge of industrial protocols like S7, Modbus TCP/RTU, and OPC-UA

Preferred Qualifications

• Proficiency in automated unit testing for PLC Logic
• Experience with SCADA systems
• Familiarity with Agile / Scrum methodologies
• Knowledge of functional safety standards (IEC 61508 / IEC 62061)

About the Company

ON.energy is building the power infrastructure that makes the AI era possible, providing power technology proven at gigawatt scale for hyper-scale campuses and cloud companies.