Senior Test Engineer - HIL

ON.energy is setting the standard for large load interconnection. ON’s patented AI UPS™ is a medium-voltage UPS that serves as a firewall, protecting the data center from the grid, and the grid from the data center. With multiple gigawatts currently under construction, we are enabling grid-safe data centers. 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. 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. Key Requirements - 5+ years of experience in HIL testing, real-time simulation, controls validation, or laboratory testing of grid-connected power electronics. - Bachelor's degree or higher in electrical engineering, power systems, controls engineering, or a related discipline. - Direct experience on at least one real-time simulation platform, such as RTDS/RSCAD, Typhoon HIL, or OPAL-RT. - Working capability with offline simulation tools such as MATLAB/Simulink and PSCAD, and an understanding of what has to change when a model is made to run in real time. - Grounding in inverter controls, energy storage systems, and power system dynamics. - Python, or a comparable language, used in earnest for test automation and data analysis. - Test plans, procedures, and acceptance criteria you have authored yourself, and the analytical rigor to stand behind the results. - Familiarity with SCADA systems and industrial communication protocols such as Modbus, DNP3, CAN, and IEC 61850. - Comfort on the bench with power supplies, oscilloscopes, transducers, and data acquisition hardware. - The ability to present technical findings credibly to engineering audiences and clearly to field and commissioning personnel. Preferred Experience - Experience with grid-forming and grid-following inverter control. - Experience with uninterruptible power supply systems, microgrids, or facilities serving critical load. - Familiarity with ISO or utility interconnection requirements, model quality testing, or third-party product certification. - Continuous-integration pipelines driving automated test suites, with version control applied to models as rigorously as to code. - Prior collaboration with national laboratories or university test centers. For US-based roles - What you’ll get: - Competitive salary + annual performance-based bonus eligibility - Medical, dental, and vision insurance - 401(k) with company match - Paid time off and company holidays For Mexico-based roles - What you’ll get: - Competitive salary + annual performance bonus eligibility - Christmas Bonus (Aguinaldo): 30 days - Major medical expenses and life insurance - Paid time off and holidays (per local policy) For all roles: - Professional development and growth opportunities - Opportunity to grow with a mission-driven team shaping the future of clean energy - Equal Opportunity: ON.energy is committed to equal employment opportunity and to maintaining a work environment free of harassment, discrimination, or retaliation. - Benefits vary by role and location and are subject to change. Agency Notice: ON.energy does not accept unsolicited resumes from staffing agencies, search firms, or third-party recruiters. Resumes submitted without a fully executed Master Services Agreement (MSA) and a written request from an authorized member of our Talent Acquisition team will be considered the property of ON.energy. No placement fees or compensation will be paid for unsolicited candidate submissions.