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 demonstrated record of operating with minimal direction in a senior technical role. 

• Architecture-level decision authority on previous grid-connected-inverter, power-electronics, or BESS equipment — you’ve made the trade-off calls others built around. 

• Proven system-level design of MW-scale power-electronics equipment, with deep converter-controls depth (grid-following / grid-forming, current limiting, protection). 

• Fluency producing and reviewing SLDs, GAs, schematics, and panel layouts; expert with AutoCAD or equivalent E-CAD. 

• Standards authority: UL 1741, IEEE 1547, IEEE 2800, IEC 62040-3, NFPA 855 / UL 9540 context; modeling with EMT tools (PSCAD, MATLAB / Simulink, PLECS). 

• Strong track record running strategic vendor / OEM relationships through design, FAT, serial production, and post-deployment escalation. 

• Excellent written and verbal communication — specs, technical positions, design-review leadership, and board-level briefings. 

• Willing to travel up to 25–30% for FAT inspections, site commissioning, customer engagements, and vendor reviews. 
  
  

Preferred Experience 

• Direct experience with data center / UPS / mission-critical power or utility-scale BESS at the architecture level. 

• Grid-forming inverters, advanced power-semiconductor (e.g., SiC) designs, and weak-grid / low-SCR EMT and impedance-stability validation. 

• History of leading products through NRTL certification (UL, CSA, Intertek) and FAT / commissioning. 

• Active Professional Engineer (PE) license; involvement in standards bodies (IEEE, UL, IEC, NFPA); patents or peer-reviewed publications.