Jobs / United States / Redwood Materials INC
Power Electronics Engineer, Energy Storage
Redwood Materials INC · 🇺🇸 San Francisco, California, United States
Sponsorship verdict
Sponsorship possible
One solid signal, not two — worth applying, and worth asking about sponsorship early.
- Employer is on a government sponsor recordThe US Department of Labor certified 33 H-1B/E-3 labor condition applications for this employer between Oct 2025 and Jun 2026 (latest Jun 2026) — the step every H-1B hire needs first. USCIS also records 3 H-1B approvals in FY2023. Source: LCA disclosure data (US Department of Labor (OFLC)).
- The posting doesn’t mention sponsorshipSilence isn’t a refusal — ask the recruiter before investing much time.
- No salary bar for this routeH-1B has no fixed salary bar: the employer must pay at least the prevailing wage for the role and area. Cap-subject employers enter a lottery weighted by wage level. Source: https://www.federalregister.gov/documents/2025/12/29/2025-23853/weighted-selection-process-for-registrants-and-petitioners-seeking-to-file-cap-subject-h-1b, rules effective 2026-02-27.
- What Redwood Materials INC paid sponsored hires in similar roles1 certified filing for “Senior Systems Engineer, Energy Storage” (Mechanical Engineers) in CA: $200k–$200k, median $200k. Most were filed at wage level III (100%) — 3 lottery entries, ≈46% projected selection odds for cap-subject employers. Source: US Department of Labor LCA disclosure data (Oct 2025 – Jun 2026).
- Confirmed live todayWhen a source last listed this job as open.
US H-1B: cap-subject employers enter a lottery weighted by wage level — Level I gets 1 entry, Level IV gets 4 (DHS projected selection odds ≈15% at Level I to ≈61% at Level IV). Universities and non-profit research employers are cap-exempt. The $100,000 fee for new petitions from abroad is currently blocked by a court order (appeal pending).
A verdict summarises public evidence; it is not legal advice and never a guarantee — the employer and the immigration authority decide. Sign in to factor in where you can already work.
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Sponsor Radar — Redwood Materials INC
The US Department of Labor certified 33 H-1B/E-3 labor condition applications for this employer between Oct 2025 and Jun 2026 (latest Jun 2026) — the step every H-1B hire needs first. USCIS also records 3 H-1B approvals in FY2023. Source: LCA disclosure data (US Department of Labor (OFLC)).
Past sponsorship or register membership never guarantees sponsorship for this vacancy or for you. Full Sponsor Radar for Redwood Materials INC →
About the role
About Redwood Materials Redwood Materials was founded in 2017 by JB Straubel, co-founder and former CTO of Tesla, on a simple but radical idea: the critical minerals powering the energy transition already exist. They just need to come back. Today Redwood is the largest lithium-ion battery recycler in North America — recovering, refining, and redeploying critical minerals from end-of-life batteries back into the supply chain. On the energy side, Redwood has deployed the largest second-life battery project in the world, delivering power to AI data centers in months rather than years using proprietary energy architecture engineered entirely in-house. The company is profitable, the market it operates in is projected to grow 20 to 50 times over the next decade, and Redwood is the only company with the supply chain, the technology, and the operational scale to lead it. Position Summary: The Power Electronics Engineer, Energy Storage designs and develops power conversion systems for Redwood's next-generation Battery Energy Storage Systems (BESS), including converters that interface with battery packs, battery modules, photovoltaic systems, and the grid for utility-scale and data center applications. This is a fully on-site role at 100 Hooper, San Francisco. The engineer independently owns complex circuit- and system-level problems spanning converter topology selection, power-stage component selection, magnetics design, PCB/PCBA layout, thermal analysis, and validation, adapting existing approaches and precedent to new and unusual design challenges. The role partners extensively with Mechanical, Firmware/Controls, Systems, Compliance, Supply Chain, and Manufacturing teams to take designs from concept through production. Success depends on sound engineering judgment, hands-on lab validation skills, and the ability to resolve ambiguous technical trade-offs with limited direction. Essential Duties and Responsibilities • Design high-voltage (800V – 25kVdc, 480–800Vac) and high-power (10kW–500kW) 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. • Collaborate with cross-functional teams (Mechanical, Controls/Firmware, Supply Chain, Manufacturing, Compliance) to define requirements, test specifications, and achieve industry certifications Skills, Knowledge, and Abilities • MS or PhD in Electrical Engineering, with a focus on power electronics. • 1-2 years of experience in electrical engineering, with a strong focus on power conversion or energy storage products, ideally for mass production. • Hands-on experience in high-voltage (up to 1.5kVdc and 800Vac) hardware design. Experience in high voltage (up to 25kVdc, 34.5kVac) for SST is a plus. • Experience with power semiconductor selection, gate drive design, and hardware protection circuits. • Deep unde