Senior Product Engineer
Apply on company siteON.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.
Role Overview
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&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.
What You’ll Do
Product Definition & Specification
- Author and maintain detailed technical specifications for the BESS and DC Cabinet — electrical, mechanical, environmental, and interface requirements.
- Review and approve detailed engineering drawings: SLDs, GAs, schematics, wiring diagrams, panel layouts, mechanical drawings, and BoMs. Own the technical change baseline.
- 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).
Vendor & Supply Chain Engagement
- 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.
- Qualify alternate suppliers and own the technical side of dual-sourcing and cost-down decisions.
Product Development
- Drive iterative product development cycles with the development team, balancing speed with the rigor expected of mission-critical hardware.
- Capture design feedback from design reviews, commissioning, and O&M, and convert it into prioritized changes on the product roadmap via a structured ECR/ECN process.
- Run trade studies on architecture and component selection where it matters — cost, reliability, lead time, performance.
Project & Commercial Support
- Support business development with technical proposals — SLDs, GAs, and SOC analysis across multiple market applications.
- Compile and own the product technical information package handed to project engineering.
- Co-lead review and validation of BESS- and DC Cabinet-related topics during project execution.
- Maintain as-built drawings and the engineering document baseline.
- Participate in commissioning, particularly for first-of-kind deployments, and bring lessons learned back into the product.
Required Qualifications
- Bachelor's degree in Electrical Engineering, Power Electronics, or a closely related technical field.
- 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.
- Proven product or system-level design experience on MWh-scale BESS or equivalent DC power equipment.
- Demonstrated experience taking a product through the full development cycle — concept, prototype, FAT, field deployment, revision — in an environment with frequent release cycles.
- Strong, demonstrable skill in detailed component sizing: fuses, cables, busbars, protection devices, and thermal sizing for enclosed cabinets.
- Fluency producing and reviewing SLDs, GAs, schematics, and panel layouts; comfortable in AutoCAD or equivalent E-CAD tools and reading mechanical drawings.
- Track record of running technical vendor relationships through design, FAT, and post-deployment.
- Excellent written communication — specs, design reviews, change notices — and the ability to translate between engineering, project, and commercial teams.
- Willing to travel up to 20%.
Preferred Plus
- Experience with data center / UPS / mission-critical power or utility-scale BESS.
- Familiarity with UL 9540 / 9540A and NFPA 855, plus the relevant codes for your target market.
- Experience with PLM tools and structured ECR/ECN workflows.
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 [email protected]
- Benefits vary by role and location and are subject to change.
Agency Notice: ON.energy does not accept unsolicited resumes from staffing agencies, search firms, or third-party recruiters. Resumes submitted without a fully executed Master Services Agreement (MSA) and a written request from an authorized member of our Talent Acquisition team will be considered the property of ON.energy. No placement fees or compensation will be paid for unsolicited candidate submissions.
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