Principal Power Electronics Engineer

ON.energy is building the power infrastructure that makes the AI era possible. As AI demand surges past what the grid and traditional data centers can support, ON.energy provides a new class of power technology proven at gigawatt scale and trusted by the world’s leading cloud and AI companies. Our systems are already deployed across 2.5 GW of hyper-scale campuses, validated by top U.S. national labs, and certified for grid-safe operation by major utilities. With real products in the field, we’re scaling faster than the grid can, transforming power from a bottleneck into a competitive advantage for the companies building the future.

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. 

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.
• Accommodations: If you need an accommodation during the application process, email recruitment@onenergystorage.com
• Benefits vary by role and location and are subject to change.