The Role
Develops and executes unit, functional, integration, and regression tests for Siemens PLC-based control systems. Builds Python and pytest automation for PLC I/O, HMI interfaces, and industrial communication protocols. Reviews and validates PLC code, conducts HIL/SIL testing, tracks defects, leads root-cause analysis, and produces test plans, reports, and traceability matrices. Collaborates with controls engineers to validate requirements and acceptance criteria.
Summary Generated by Built In
Title: Quality Assurance Engineer, PLC Automation
Location: Remote/Hybrid
Term: FTE, Direct Hire
Position Overview
Our client is building the backbone of energy and AI infrastructure powering grid-safe data centers and mission-critical facilities. The company supplies and operates hyperscale power systems that solve the toughest resilience challenges, delivering custom solutions for AI data centers, mission-critical facilities, and front-of-the-meter assets. Our client recently announced a 5GW partnership, with 3GW currently under construction across multiple hyperscale data center campuses. With patented technology and proprietary software, our client develops projects worldwide that set new benchmarks for resilience.
The Quality Assurance Engineer is responsible for hands-on experience in PLC programming, industrial protocol testing, and Python-based test automation. Skilled in designing and executing functional and integration test cases across PLC platforms and communication protocols.
Key Responsibilities:
Required Experience & Skills
Location: Remote/Hybrid
Term: FTE, Direct Hire
Position Overview
Our client is building the backbone of energy and AI infrastructure powering grid-safe data centers and mission-critical facilities. The company supplies and operates hyperscale power systems that solve the toughest resilience challenges, delivering custom solutions for AI data centers, mission-critical facilities, and front-of-the-meter assets. Our client recently announced a 5GW partnership, with 3GW currently under construction across multiple hyperscale data center campuses. With patented technology and proprietary software, our client develops projects worldwide that set new benchmarks for resilience.
The Quality Assurance Engineer is responsible for hands-on experience in PLC programming, industrial protocol testing, and Python-based test automation. Skilled in designing and executing functional and integration test cases across PLC platforms and communication protocols.
Key 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
Required Experience & Skills
- 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
Skills Required
- 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 platforms
- 5+ years of experience building and maintaining automated test frameworks using pytest or an 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 S7, Modbus TCP/RTU, and OPC-UA industrial communication protocols
- Proficiency in automated unit testing of PLC logic
- Experience with SCADA systems
- Familiarity with Agile/Scrum methodologies in industrial settings
- Knowledge of functional safety standards IEC 61508 and IEC 62061
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The Company
What We Do
The ASCENDING team commits to delivering scalable and high-available cloud solutions to clients. We use advanced technology to measure the effectiveness of your current IT infrastructure. Then we help our clients migrate to the cloud and modernize their IT infrastructure.
