Battery Post-Sales Application Engineer

Amprius • Fremont, CA

23d • Onsite

About The Position

Amprius Technologies, Inc., a manufacturer of high-energy and high-power lithium-ion batteries, is hiring a Battery Post-Sales Application Engineer to perform post-sales technical application development with technical leadership and customers. The role supports battery-pack integration, troubleshooting, validation, and the coordination of third-party testing, helping bring battery solutions into customer applications. It is intended for a technically minded engineer interested in moving from pure R&D into customer-facing, solution-oriented work.

The position is based in the Fremont office and involves regular collaboration with partner companies, with travel of up to 25% to external testing and manufacturing partners, industry events and conferences, and trade shows. The role requires hands-on battery-pack design and failure-analysis experience, technical project coordination, and effective communication with internal teams and external partners.

Requirements

• BS, MS, or ME degree in Mechanical, Electrical, Materials Science, Chemical, Manufacturing, or Integration Engineering, or a related STEM field.
• At least 5 years of relevant professional experience.
• Experience in technical product management within the battery, electric vehicle, aero-astro, drone, or consumer electronics sectors.
• Understanding of lithium-ion battery chemistry, charging profiles, and safety protocols.
• Experience with battery-pack design for manufacturability.
• Hands-on battery-pack failure analysis and teardown experience, including familiarity with common cylindrical- and pouch-pack failure modes.
• Experience with battery management system design to ensure battery safety and prevent field misapplication.
• Ability to build required test setups and integrate system tools for metrology measurement.
• Ability to analyze technical data and use Excel or similar tools for performance modeling.
• Ability to write clear technical reports and communicate effectively with internal teams and external partners.
• High accuracy in tracking validation schedules and technical specifications.
• Willingness to travel up to 25%.

Nice To Haves

• Experience working on high-voltage battery systems.
• Knowledge of lithium-ion cell design, cell manufacturing, cell assembly, and cell electrochemical performance testing.
• Experience with cycling test systems such as Arbin, Neware, or Chroma.
• Hands-on experience building mechanical or electrical systems, including machining, mechanical manufacturing, sheet-metal fabrication, or welding.
• Experience in pack reliability performance evaluation.
• Knowledge of battery-system design considerations for mitigating thermal-runaway risk.
• Experience with system design supporting customer battery-pack certification, including UN38.3, IEC62133, RTCA DO-311A, or EASA certification.

Responsibilities

• Oversee battery-pack sample test plans for specific applications and track progress across internal and external laboratories to keep schedules on track.
• Perform preliminary cell-to-pack configuration calculations, including voltage, capacity, and series/parallel layouts, and assess manufacturability to support production ramping.
• Visit pack houses to document capabilities and help onboard new manufacturing partners.
• Conduct hands-on battery-pack teardown and failure analysis to distinguish pack failures from cell failures.
• Assist with gathering data for certification and cell- and pack-level abuse testing.
• Lead certification-related projects and work with test houses and advisory boards to improve battery-pack design.
• Troubleshoot battery thermal performance and support functional performance prediction and dysfunctional thermal-runaway evaluation.
• Maintain and update cell-sample and pack-building qualification schedules, and flag potential delays to the account manager.
• Document pack-qualification feedback and cell-to-pack quality issues, and route customer concerns to R&D and Quality teams for resolution.

Benefits

• Medical, dental, and vision coverage, with HMO and PPO medical options.
• Employer-funded Health Reimbursement Account (HRA).
• HSA-compatible medical plan and FSA options.
• Pet health insurance for dogs and cats.
• Traditional and Roth 401(k) plans.
• Vacation leave starting at three weeks of annual accrual.
• 10 paid holidays.
• Sick time off.
• Cell phone reimbursement.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior