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Controls Engineer - Plant Controls Products at Terabase Energy. Position Summary . Terabase is seeking a highly technical Controls Engineer to work on Plant Controls Product team. This role will contribute to development and continuous improvement of our plant-level controls software and validation platforms. . This role is focused on controls development, product engineering, and system validation across Terabase’s Plant Controls portfolio, including Master Plant Controller (MPC), PV Site Controller, Energy Management System (EMS), Hardware-in-the-Loop (HIL) testing-as-a-service and other initiatives.  . The ideal candidate is deeply experienced in IEC-61131-3 based control logic development, capable of independently debugging complex systems, and comfortable working across software, power systems modeling, and real-time validation environments. . This role is primarily product engineering focused, with limited project support responsibilities (<20%) as needed. . Key Responsibilities . Controls Development & Product Engineering . Design, develop, and maintain control logic for Terabase plant-level controllers using IEC-61131-3 platforms (e.g., Codesys, AcSELerator, or equivalent). . Architect modular, scalable, and maintainable control solutions across multiple product lines. . Debug, trace, and resolve complex control system issues at both software and system levels. . Contribute to feature development, algorithm refinement, and performance optimization. . Collaborate cross-functionally with project engineering and product management.  . Validation & Testing . Develop and execute structured test plans for new product features and releases. . Support and enhance Hardware-in-the-Loop (HIL) environments for controller validation. . Analyze and interpret system performance data to validate functional and grid compliance requirements. . Clearly document and communicate test results to internal and external stakeholders. . Documentation & Engineering Rigor . Produce professional-grade documentation, which may include functional specifications, test plans and validation reports, and release documentation.  . Maintain strong configuration management and change control discipline. . Present technical findings in a clear, structured, and professional manner. . Project support . Provide technical expertise during project implementation, commissioning, or issue resolution. . Support troubleshooting and root cause analysis for deployed systems . Basic Qualifications. Bachelor’s degree in engineering or related technical field. . Experience developing control logic using IEC-61131-3 environments such as, Codesys, AcSELerator or similar PLC-based platforms . Strong debugging skills - able to independently trace code execution and identify bugs or other issues . Demonstrated excellence in documentation and technical communication. . Ability to clearly convey validation results and technical findings to engineering teams and stakeholders. . Self-sufficient and proactive — able to own features from concept through validation . Preferred Qualifications . Experience with utility-scale renewable generation (PV, BESS, hybrid plants) or traditional power generation. . MATLAB / Simulink modeling experience. . Power systems analysis experience (PSCAD, PSS®E, or equivalent tools). . Experience with Hardware-in-the-Loop (HIL) systems such as OPAL-RT, Speedgoat or RTDS . Familiarity with grid interconnection requirements and plant-level control strategies. . Experience developing products in a structured product lifecycle environment. .  . Company Location: United States.