Senior Cell Engineer
Company
San Jose, CA · Posted December 10, 2025
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Where San Jose, CA ranks
Where San Jose, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #1Best cities for marketing pay after cost of living$204k · of 16
- #1Best cities for aerospace and defense pay after cost of living$187k · of 19
- #2Best cities for security pay after cost of living$220k · of 10
- #3Best cities for technology pay after cost of living$205k · of 80
- #5Best cities for technology jobs1,449 openings · of 100
- #5Cities with the most jobs that do not need a four-year degree in the West Coast162 jobs · of 47
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
How AI is used in this kind of work
AI use among mechanical engineers is little observed so far. Measured exposure for mechanical engineers: 8% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
About the job
ABOUT THE COMPANY
We are a stealth-mode battery startup developing cutting-edge battery technology. Our mission is to revolutionize battery technology to accelerate the global transition to clean energy. By leveraging innovative materials and advanced manufacturing techniques, we are building the future of sustainable energy.
CAN'T FIND THE COMPANY NAME?
It’s not you, it’s us! We’re really excited about the potential of our technology, product, and mission, and have chosen to remain in stealth mode. If the job description piques your interest, please apply. If your skillset is aligned with what we’re looking for, the team will reach out to schedule your interview and tell you a bit more about us (e.g. who we are).
ROLE
We are seeking an experienced and highly skilled Senior Battery Cell Engineer to play a key role in driving innovation and decision-making in our fast-paced start-up environment. This position requires broad expertise in battery cell design, the ability to navigate ambiguity, and a commitment to developing cutting-edge energy storage solutions.
RESPONSIBILITIES
- Lead the design, development, and optimization of lithium-ion battery cells, focusing on performance, safety, and cost-effectiveness.
- Develop material-level specifications and technical requirements for cathode, anode, electrolyte, separator and other key cell components to support battery cell development
- Evaluate and qualify battery materials and technologies, working closely with supplier and internal teams to define materials performance specifications
- Conduct root cause analysis of cell performance, reliability and manufacturing issues through hands on experimentation, electrochemical analysis and failure investigation
- Provide data driven solutions to support product development decisions.
- Oversee cell fabrication, testing, and performance validation, ensuring scalability and manufacturability.
- Conduct in-depth analysis of materials, chemistries, and failure mechanisms to improve cell performance.
- Collaborate cross-functionally with engineering, R&D, and manufacturing teams to meet project milestones.
- Mentor and guide junior engineers and technicians, fostering technical growth and innovation.
- Stay up-to-date with industry trends and emerging technologies to maintain competitive advantage.
QUALIFICATIONS
- Master’s or Ph.D. in Chemical Engineering, Materials Science, or a related field, with 10+ years of experience in lithium-ion battery development.
- Broad knowledge of lithium ion battery materials, including active and non-actives and interactions within a battery cell
- Extensive knowledge of cell design, electrochemical principles, and materials characterization techniques.
- Proven ability to lead projects and make decisions in evolving environments.
- Hands-on experience with battery fabrication, testing, and manufacturing processes.
- Exceptional problem-solving, leadership, and communication skills.
WHY JOIN US?
- Innovative Technology: Work on cutting-edge energy storage solutions that power the future.
- Career Growth: Opportunities to work on high-impact projects and advance in a growing industry.
- Competitive Benefits: Comprehensive health, wellness, and professional development programs.
- Mission-Driven Culture: Be part of a team that is shaping the future of sustainable energy through innovation and excellence.
We are an equal opportunity employer and we do not discriminate on the basis of race, gender, sexual orientation, gender identity/expression, national origin, disability, age, genetic information, veteran status, marital status, pregnancy or related condition, or any other basis protected by law.