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About Redwood Materials Redwood is localizing a global battery supply chain that seamlessly integrates recovery, reuse, and recycling  —  keeping critical minerals in circulation and driving the energy transition. Founded in 2017,  we’re delivering low-cost and large-scale energy storage and producing battery materials in the U.S. for the first time, all from batteries we already have. As a Power Electronics Engineer for Energy Storage, you will develop Redwood’s next-generation Battery Energy Storage Systems (BESS). In this role, you will design advanced power converters that interface with battery packs, battery modules, photovoltaic (PV) systems, and the grid for large-scale energy storage applications, including AI datacenters. This role involves solving practical circuit- and system-level challenges in converter topology, power-stage component selection (e.g., MOSFETs and magnetics), PCB/PCBA design, thermal analysis, integration, and validation. In addition, you will work with a variety of cross-functional teams such as ME, FW/Control, System, Compliance, Supply Chain, and Manufacturing teams. At Redwood, we build high-efficiency, high-reliability, and low-cost BESS solutions using repurposed batteries, creative engineering approaches, and vertical integration. This creates a unique and rewarding set of technical challenges for engineers who enjoy solving complex power electronics problems.    Responsibilities  <Power Electronics Hardware Design> Design high-voltage (800V–1.5kVdc, 480–800Vac) and high-power (10kW–200kW) converters tailored for utility-scale BESS and industrial infrastructure. Conduct comprehensive topology comparison and trade-off analyses evaluating efficiency, power density, cost, and manufacturability. Perform power-stage component sizing and Si/SiC MOSFET selection based on loss modeling and thermal management. Design robust gate driver circuits and dedicated gate driver power supplies to ensure safe, high-frequency switching operations. Lead the design, modeling, and specification of custom magnetic components, including transformers and inductors utilizing Litz-wire or PCB-winding architectures. Architect the low-voltage (LV) subsystem, including auxiliary power supplies, sensing circuitry (voltage/current/temperature), and hardware-level protection. Design and optimize EMI filters, including differential-mode and common-mode inductors, X/Y-caps, and damping elements. Drive high-voltage, high-power PCB/PCBA layout design, ensuring clearance/creepage rules and signal integrity under high-noise environments.  <Cross-Functional Collaboration & Productization> Review, define, and amend system requirements for power electronics products. Work with the Mechanical Engineering team to optimize cooling methods and thermal stack-up analysis and product geometry. Collaborate with the Control and Firmware teams to develop, simulate, and implement converter control algorithms. Define test specifications and verification methodologies with the validation team. Work with the Supply Chain team to identify alternative components for dual-sourcing and define technical requirements for critical components (e.g., MOSFETs, film capacitors). Identify test scopes and technical specifications for mass production testers (ICT, FCT, EOL) in close collaboration with the Manufacturing team. Provide component-level data and operational profiles to the Reliability team to support rigorous product life cycle and failure analysis. Work with the Compliance team to achieve industry certifications (e.g., IEEE 1547, UL 1741).   Qualifications  MS or PhD in Electrical Engineering, with a focus on power electronics.  3–5 years of experience in electrical engineering, with a strong focus on power conversion or energy storage products, ideally for mass production.