Power Electronics Lead - Integrated Rack Power Platform

Job Description

Power Electronics Lead – Integrated Rack Power Platform

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Location: San Jose, CA (On-site)

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Reports To: Head of Engineering, Data Center Power Platform

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About the Role

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We are building a first-of-its-kind integrated PSU + BBU rack power shelf that collapses the traditional two-shelf architecture (separate power supply and battery backup) into a single, high-density platform powered by solid-state battery technology. This shelf will compete directly with incumbent rack power offerings from Delta, LITEON, and similar vendors, targeting hyperscale AI data center deployments.

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As the Power Electronics Lead, you will own the complete power conversion architecture—from AC mains or 48V DC bus input through regulated output rails, including the bidirectional charge/discharge path for the integrated solid-state battery pack. You will serve as the chief engineer for the power stage and the technical decision-maker whose topology choices influence every engineering discipline on the team.

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What You'll Do

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• Architect the end-to-end power conversion topology, including:

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• AC-DC front end

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• Intermediate bus

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• DC-DC output stage

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• Bidirectional battery converter path

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• Lead topology trade-off analysis across:

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• LLC resonant converters

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• Phase-shifted full bridge (PSFB)

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• Hybrid converter approaches

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• In-line versus parallel sidecar battery integration

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• Design magnetics including planar transformers and coupled inductors.

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• Select power semiconductors (GaN/SiC FETs and diodes) with thermal derating analysis.

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• Define and drive efficiency targets (97%+ Titanium-class performance at rack load) and power density goals within a 1OU or 2OU shelf envelope.

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• Collaborate closely with firmware and embedded engineering on digital control loop implementation including:

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• Voltage/current mode compensation

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• Loop bandwidth

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• Phase margin optimization

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• Partner with the Battery Systems Engineer to define:

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• Charge/discharge power path

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• Voltage operating window

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• Current limits for solid-state battery cells

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• Design protection circuitry including:

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• Overcurrent Protection (OCP)

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• Overvoltage Protection (OVP)

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• Overtemperature Protection (OTP)

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• Short-circuit protection

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• Define system fault response behavior.

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• Bring up and validate prototype power stages through:

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• Hardware bring-up

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• Thermal characterization

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• Efficiency optimization

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• Work closely with PCB layout engineers to ensure:

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• EMI-conscious layout

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• Proper creepage and clearance

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• Power plane integrity

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What You Bring

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Required Qualifications

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• 10+ years designing multi-kW AC-DC or DC-DC power converters that have shipped in volume.

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• Deep expertise in at least two converter topologies such as:

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• LLC

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• PSFB

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• DAB

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• CLLC

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• Equivalent architectures

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• Hands-on magnetics design experience including:

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• Core selection

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• Winding strategy

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• Loss modeling

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• Experience with digital power control using DSP/MCU-based compensation techniques.

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• Proven track record developing:

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• Server power supplies

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• Telecom rectifiers

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• EV onboard chargers

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• Comparable high-density power products

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• Proficiency using simulation tools including:

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• PLECS

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• LTspice

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• Simplis

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• PSIM

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• Comfortable providing technical leadership and mentoring a small cross-functional engineering team.

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Qualifications

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• Experience designing with GaN or SiC wide-bandgap power devices.

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• Familiarity with 48V and high-voltage DC bus architectures.

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• Experience with bidirectional power converters, especially integrated battery charging paths.

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• Knowledge of Open Compute Project (OCP) Open Rack / ORv3 power delivery specifications.

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• Experience developing battery charging systems including:

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• CC-CV charging profiles

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• Temperature-dependent charge rate management

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• Experience with Hardware-in-the-Loop (HIL) testing platforms including:

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• Typhoon HIL

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• PLECS RT Box

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Why This Role Matters

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Your architectural decisions will define the entire product. Whether the battery is integrated inline or connected through a sidecar bus, whether the system utilizes GaN at 48V or silicon at 12V, and whether hold-up transfer occurs in microseconds or requires a brief interruption—every downstream engineering discipline will build upon your decisions.

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This is a rare opportunity to design a next- rack power platform from a blank sheet using breakthrough solid-state battery technology that fundamentally changes what is possible for AI data center power infrastructure.

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