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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. The Hyperscale Datacenter Senior Electrical Engineer is the senior electrical authority for  ON.energy's  presence at hyperscale, colocation, enterprise, and AI-focused data centers. This role is focused on data center electrical engineering, while maintaining utility-interface fluency to translate customer, operator, substation, and site-infrastructure requirements into deployable product requirements, interfaces, and reference electrical designs.   Key Responsibilities Reference Architectures & System Definition   Inform the end-to-end electrical reference architectures for  ON.energy  products across hyperscale, colocation, enterprise, and AI factory topologies LV  and  MV distribution, data center substation interfaces, and next-generation 800 Vdc designs. Define single-line diagrams, redundancy models, substation interface assumptions, and fault-tolerance strategies for UPS, BESS, PCS, microgrid, and EMS integration. Establish and enforce Interface Control Documents (ICDs) between ON.energy  equipment and upstream utility, downstream IT load, and site controls.   Requirements Engineering   Own the requirements traceability matrix from customer SOW to system architecture to subsystem to component test. Define compliance boundaries against applicable standards such as TIA-942, ASHRAE TC 9.9, and IEC 62040.   Customer & Ecosystem Engagement   Act as the technical face to hyperscale, colocation, and AI infrastructure customers throughout new product development. Lead architecture reviews with project engineering teams, data center operators, and chip / server OEMs. Represent ON.energy  in industry working  groups and  codify insights into  technology  roadmap s .   Product & Technology Roadmap   Inform the architectural roadmap for  ON.energy  product architectures. Evaluate emerging DC power distribution, solid-state transformer , and grid-interactive architectures; recommend build / buy / partner strategies. Own vendor evaluation and technology partner scorecards from a systems-fit perspective.     Experience & Requirements Education:  B.S. in Electrical Engineering, Power Systems Engineering, or related field required. M.S. preferred; PhD acceptable  where  paired with substantial applied data center electrical design experience. Experience:  5+ years in data center electrical systems, mission-critical facilities, hyperscale infrastructure, or A&E engineering serving hyperscale / colocation customers. Domain Depth:  Hyperscale and colocation electrical topologies from utility service entrance, data center substation design, MV/LV distribution, UPS and BESS integration, redundancy strategy, fault isolation, and server rack PDU interface requirements.   Preferred Experience Architected power delivery for AI training clusters (>100 kW / rack, liquid-cooled, coincident load dynamics). Prior work as a hyperscaler owner's engineer, colocation infrastructure lead, or MEP principal for mission-critical facilities. Publi