Principal Power Electronics Engineer

ON.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. We’re looking for a Principal Power Electronics Engineer to set the technical direction for the grid-connected inverters at the heart of ON.energy’s AI UPS product family. This is the senior technical voice for power electronics on the product team: you architect the converter and controls approach, resolve the hardest engineering trade-offs, set the engineering standards others work to, and represent ON.energy’s inverter engineering externally — to vendors, customers, certifying bodies, and the broader industry. You are fluent in power electronics, its controls (grid-following and grid-forming), and BESS integration — ideally with UPS experience in mission-critical applications — and you own the inverter technical thread from proposal through FAT, commissioning, and field feedback for MW-scale systems. Key Responsibilities Architecture & technical authority Own the grid-connected-inverter product architecture and converter-controls strategy — grid-following and grid-forming operation, current limiting, and dynamic grid support — and the technical roadmap across concurrent product cycles. Define the engineering standards, design rules, and review gates the team works to; act as the final technical authority on the inverter change baseline. Serve as the company’s SME for grid-code and UPS performance compliance — IEEE 2800, IEEE 1547, UL 1741, IEC 62040-3, ERCOT ride-through — and set the inverter qualification / type-test program, acceptance criteria, and current-limit / short-circuit and data-evidence requirements suppliers must meet. Act as the ultimate escalation point for inverter root-cause analysis (current-limit, post-fault recovery, thermal, control instability) and drive corrective design changes. Mentor senior power-electronics, controls, and project engineers to scale the team’s technical capability. Vendor management & supply strategy Own the strategic inverter vendor / OEM relationships and decide their architecture — sole-source vs dual-source, co-development depth, and IP boundaries. Set and enforce the inverter technical qualification process; run the highest-stakes design reviews and resolve the highest-stakes vendor escalations personally. Oversee vendors through design, FAT, serial production, and post-deployment corrective action; own procurement technical specifications and acceptance. Maintain vendor scorecards and drive continuous improvement across the supply base. Proposal, documentation & project support Support business development with technical proposals — SLDs and GAs — that meet the customer’s needs, and compile inverter technical information packages for the project engineering team. Co-lead review and validation of inverter-related topics during project execution; maintain technical documentation, including as-built drawings. Support integration of the inverter with the EMS, Plant Controller, and SCADA layers. Product development Capture design-improvement feedback across the design, commissioning, and O&M phases and turn it into product changes. Recommend design approaches and vendors for the main equipment; participate in product design sprints and in the product’s commissioning phase. Required Qualifications & Skills Bachelor’s degree in Electrical Engineering, Power Electronics, or a closely related technical field; MS preferred. 10+ years of hands-on power-electronics engineering, with a demonstr…