Senior PLC QA Engineer | Remote, Python + HIL/SIL

ASCENDING

United States

Hybrid

USD 110,000 - 150,000

Full time

8 days ago

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Job summary

ASCENDING is seeking a Quality Assurance Engineer focused on PLC automation. You will design and execute tests for PLC-based control systems, develop Python-based test automation, and validate communication protocols across Siemens platforms.

This role blends software testing with industrial automation to ensure reliable energy data center infrastructure. You will collaborate with controls engineers, create test plans, and maintain automated frameworks (pytest), including HIL/SIL testing where

Qualifications

Bachelor-level degree in software/quality engineering or related field.
5+ years hands-on PLC programming and testing (Siemens platform).
5+ years building/maintaining automated test frameworks (pytest or equivalent).
3–5 years Siemens TIA Portal experience for PLC development/diagnostics.
Experience designing functional and integration tests, including defect tracking.

Responsibilities

Design, develop, and execute unit, functional, integration, and regression tests for PLC-based control systems.
Write and maintain Python-based automated test scripts for PLC I/O, HMI interfaces, and protocols.
Develop, review, and validate PLC code (Ladder Logic, FBD, ST) on Siemens S7-1200/1500.
Collaborate with controls engineers to define acceptance criteria and validate requirements.
Identify, document, and track defects; lead root cause analysis for critical failures.
Conduct HIL/SIL testing where applicable.
Produce test plans, reports, and traceability matrices aligned with release timelines.