Senior Product Engineer at ON.energy

<div class="content-intro"><p>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.</p></div><h3>Role Overview</h3> <p><span data-teams="true">We're looking for a Senior Product Engineer to own the technical design, specification, and continuous improvement of our BESS and DC Cabinet product lines. This is a product role at its core: you'll author technical specifications, drive vendor engagement, perform detailed component sizing, and partner with project, commissioning, and O&amp;M teams to close the loop between field experience and product design. You should have lived through full product development cycles and know how to bring engineering discipline into a fast-moving environment with frequent release cycles.</span></p> <h3>What You’ll Do</h3> <p><em>Product Definition &amp; Specification</em></p> <ul> <li>Author and maintain detailed technical specifications for the BESS and DC Cabinet — electrical, mechanical, environmental, and interface requirements.</li> <li>Review and approve detailed engineering drawings: SLDs, GAs, schematics, wiring diagrams, panel layouts, mechanical drawings, and BoMs. Own the technical change baseline.</li> <li>Perform in-depth component sizing: fuses, busbars, cables, contactors, disconnects, protection coordination, short-circuit and arc-flash inputs, and thermal sizing of cabinets (forced air / HVAC, natural convection, hot-spot analysis, derating).</li> </ul> <p><em>Vendor &amp; Supply Chain Engagement</em></p> <ul> <li>Lead technical engagement with key vendors — particularly on the DC Cabinet — driving specs into RFQs, evaluating vendor designs, running design reviews, and resolving issues through prototyping, FAT, and serial production.</li> <li>Qualify alternate suppliers and own the technical side of dual-sourcing and cost-down decisions.</li> </ul> <p><em>Product Development</em></p> <ul> <li>Drive iterative product development cycles with the development team, balancing speed with the rigor expected of mission-critical hardware.</li> <li>Capture design feedback from design reviews, commissioning, and O&amp;M, and convert it into prioritized changes on the product roadmap via a structured ECR/ECN process.</li> <li>Run trade studies on architecture and component selection where it matters — cost, reliability, lead time, performance.</li> </ul> <p><em>Project &amp; Commercial Support</em></p> <ul> <li>Support business development with technical proposals — SLDs, GAs, and SOC analysis across multiple market applications.</li> <li>Compile and own the product technical information package handed to project engineering.</li> <li>Co-lead review and validation of BESS- and DC Cabinet-related topics during project execution.</li> <li>Maintain as-built drawings and the engineering document baseline.</li> <li>Participate in commissioning, particularly for first-of-kind deployments, and bring lessons learned back into the product.</li> </ul> <h3>Required Qualifications</h3> <ul> <li>Bachelor's degree in Electrical Engineering, Power Electronics, or a closely related technical field.</li> <li>6+ years of hands-on engineering experience in BESS, power electronics, UPS, or comparable mission-critical / industrial power systems, with clear evidence of ownership through full product development cycles.</li> <li>Proven product or system-level design experience on MWh-scale BESS or equivalent DC power equipment.</li> <li>Demonstrated experience taking a product through the full development cycle — concept, prototype, FAT, field deployment, revision — in an environment with frequent release cycles.</li> <li>Strong, demonstrable skill in detailed component sizing: fuses, cables, busbars, protection devices, and thermal sizing for enclosed cabinets.</li> <li>Fluency producing and reviewing SLDs, GAs, schematics, and panel layouts; comfortable in AutoCAD or equivalent E-CAD tools and reading mechanical drawings.</li> <li>Track record of running technical vendor relationships through design, FAT, and post-deployment.</li> <li>Excellent written communication — specs, design reviews, change notices — and the ability to translate between engineering, project, and commercial teams.</li> <li>Willing to travel up to 20%.</li> </ul> <h3>Preferred Plus</h3> <ul> <li>Experience with data center / UPS / mission-critical power or utility-scale BESS.</li> <li>Familiarity with UL 9540 / 9540A and NFPA 855, plus the relevant codes for your target market.</li> <li>Experience with PLM tools and structured ECR/ECN workflows.</li> </ul><div class="content-conclusion"><hr> <p><strong>For US-based roles - What you’ll get:</strong></p> <ul> <li>Competitive salary + annual performance-based bonus eligibility</li> <li>Medical, dental, and vision insurance</li> <li>401(k) with company match</li> <li>Paid time off and company holidays&nbsp;</li> </ul> <p><strong>For Mexico-based roles - What you’ll get:</strong></p> <ul> <li>Competitive salary + annual performance bonus eligibility</li> <li>Christmas Bonus (Aguinaldo): 30 days</li> <li>Major medical expenses and life insurance</li> <li>Paid time off and holidays (per local policy)</li> </ul> <p><strong>For all roles:</strong></p> <ul> <li>Professional development and growth opportunities</li> <li>Opportunity to grow with a mission-driven team shaping the future of clean energy</li> <li>Equal Opportunity: ON.energy is committed to equal employment opportunity and to maintaining a work environment free of harassment, discrimination, or retaliation.</li> <li>Accommodations: If you need an accommodation during the application process, email <a href="mailto:[email protected]">[email protected]</a></li> <li>Benefits vary by role and location and are subject to change.</li> </ul></div>