We9re looking for a Principal Power Electronics Engineer to set the technical direction for the grid-connected inverters at the heart of ON.energy9s 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.energy9s 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 ResponsibilitiesArchitecture & 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 company9s 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 team9s 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 customer9s 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 product9s commissioning phase.
Required Qualifications & Skills - Bachelor9s 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 - you9ve 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 you9ll 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 you9ll 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
