Jobs / United States / Redwood Materials INC
Senior Battery Test and Validation Engineer
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 roles2 certified filings for “Software Engineer” (Software Developers) in CA: $215k–$245k, median $230k. Most were filed at wage level IV (100%) — 4 lottery entries, ≈61% 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).
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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 Senior Battery Test and Validation Engineer owns and runs Redwood's battery characterization program and serves as the technical authority on what gets tested, how, and why. This is a fully on-site role at 100 Hooper. The role translates open-ended performance, compliance, and system-level questions into test protocols and delivers data-driven answers that inform pack qualification decisions. This role sits at the center of understanding how second-life battery systems for data centers behave across varied cell chemistries, form factors, and usage histories, generating the foundational data that feeds site operating parameters, battery models, and algorithms. This is an on-site role. Essential Duties and Responsibilities: • Design test protocols by translating high-level performance and compliance questions into concrete test matrices, channel allocations, and timelines • Execute and manage concurrent test and screening campaigns across multiple battery types at the cell, module, and pack level, including cycler programming, test monitoring, and failure root-cause analysis • Drive lab infrastructure and equipment strategy, evaluating and recommending cycler and chamber purchases, fixture design, and channel capacity planning as the program scales • Analyze, interpret, and present test data to both technical and non-technical stakeholders, turning raw results into clear engineering conclusions that inform qualification decisions and program risk assessment • Innovate on test methodology and execution to extract maximum insight from limited channels and time, including smarter test matrix designs, advanced cycler programming, and developing automation scripts • Collaborate with the battery software and data engineering team to define, prioritize, and validate software automation of characterization processes Skills, Knowledge, and Abilities: • BS or MS in Engineering (Mechanical, Chemical, Materials, Electrical), or a related field • Minimum 3 years of experience • Strong intuition for lithium-ion cell behavior, operating limits, cell-level failure modes, and degradation mechanisms • Hands-on experience with electrochemical characterization techniques such as HPPC, EIS, dQ/dV analysis, and cycle life testing • Proficiency in data analysis and scripting with Python or MATLAB • Experience with battery cycler platforms (e.g., Arbin, Maccor, Neware) including test programming and troubleshooting • Strong communication skills and ability to collaborate effectively with systems engineers, battery algorithms engineers, compliance teams, and program managers to ensure cross-functional stakeholder needs are met • Deep drive to automate workflows and reduce manual processes to improve test efficiency and minimize errors • Bonus: experience with AI tools, especially coding assistants like Cursor or Claude Code; background in EV battery pack qu