The posting, in ON.energy's own words
archived Sep 11, 2026ON.energy 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. ON recently announced a 5GW partnership, with 3GW currently under construction across multiple hyperscale data center campuses. With patented technology and proprietary software, ON.energy develops projects worldwide that set new benchmarks for resilience.
Role Summary
The HIL Test Engineer develops and operates hardware-in-the-loop and real-time simulation capability for ON.energy storage and power conversion products. The role covers real-time model development, integration of controllers and firmware with the simulation environment, execution of structured test campaigns, and the reporting that supports design reviews and product release. This is a hands-on laboratory and integration role, working closely with the controls, firmware, modeling, and product engineering teams.
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Key Responsibilities
Develop and maintain real-time models of plant, grid, and equipment behavior for use in controller testing. Configure and operate the HIL environment, including real-time simulator, I/O interfaces, signal conditioning, and data acquisition. Integrate product controllers, control software, and firmware builds with the simulation environment, and maintain those configurations under version control. Integrate supplier-provided equipment models and develop equivalent models where required. Plan and execute functional, performance, fault, boundary-condition, and regression test campaigns against defined acceptance criteria. Verify control performance across normal operation, disturbances, abnormal conditions, and recovery. Compare test results against offline simulation studies and laboratory measurements, and resolve discrepancies. Develop scripts and tooling to automate test execution, data processing, and reporting. Investigate failures with controls and firmware engineers, support root-cause analysis, and re-test to closure. Prepare test reports documenting method, configuration, results, limitations, and recommendations. Maintain laboratory safety, equipment, configuration records, and documentation.