Battery Post-Sales Application Engineer

Amprius; Fremont (CA); On-site; USD 130,000 - 165,000; Full time

Benefits offered by this job

Competitive base salary

Medical, dental and vision coverage

HSA/FSA options

401(k) with employer match

Cell phone reimbursement

Generous vacation and holidays

Job summary

Amprius Technologies, Inc. in Fremont, CA, seeks a Battery Post-Sales Application Engineer to work with technical leadership and customers on post-sales application development.

You will troubleshoot integration design of battery packs and coordinate third-party testing to bring new solutions to life. This role requires hands-on design-for-manufacturability support, pack-level analysis, and certification activities (UN38.3, IEC62133).

Qualifications

• BS/MS/ME in Mechanical, Electrical, Materials Science, Chemical Engineering, Manufacturing or Integration engineering or related STEM field.
• Experience with battery pack design, manufacturability and testing coordination.
• Understanding of Li-ion battery chemistry, safety protocols and certification processes.

Responsibilities

• Test coordination: oversee battery pack sample tests and track progress across labs.
• Pack troubleshooting: preliminary design for pack configurations and manufacturability assessment.
• Design for manufacturability: site visits and onboarding of manufacturing partners.
• Battery pack failure analysis: teardown to isolate pack vs cell failure; HV systems experience preferred.
• Certification support: data gathering for UN38.3, IEC62133, RTCA DO-311A, or EASA; lead with test houses.
• Thermal design troubleshooting: evaluate thermal performance and safety implications.

Skills

Analytical skills

Communication

Prototyping

Detail oriented

Project coordination

Education

BS, MS, or ME in Mechanical, Electrical, Materials Science, Chemical Engineering, Manufacturing engineering, Integration engineering (or related STEM field)

Tools

Arbin

Neware

Chroma

Excel

Job description

Amprius Technologies, Inc. is a leading manufacturer of high energy and high-power lithium-ion batteries, producing the industry’s highest-known commercially available energy density cells. The Company’s corporate headquarters’ is in Fremont, CA where it maintains an R&D lab and a MWh-scale manufacturing facilities for the fabrication of silicon anodes and cells. For more information about the company, please visit www.amprius.com.

As a Battery Post-Sales Application Engineer, you will work closely with technical leadership and customers to perform post-sales technical application development. The responsibility includes troubleshooting integration design of battery pack, and coordinating 3rd party battery pack testing that brings new battery solutions to life. This is a high-growth role for a technically-minded engineer who wants to move from pure R&D into a customer-facing, solution-oriented career.

Key Responsibilities

Testing & Validation

• Test Coordination: Oversee battery pack sample test plans for specific applications and track progress across internal and external labs to ensure schedules stay on track.

Pack Troubleshooting & Partner Support

• Cell-to-pack Architecture Calculation: Perform preliminary design for pack configurations (voltage, capacity, series/parallel layouts) and analyze design for manufacturing capability to ensure smooth production ramping.

• Design for manufacturability support: Join site visits to pack houses to document capabilities and assist in the onboarding of new manufacturing partners. Experience in battery pack design for manufacturability required.

• Battery Pack Failure analysis: hands‑on experience performing battery pack teardown failure analysis to isolate battery pack failure from battery cell failure. Familiarity with common failure modes of cylindrical battery pack and pouch battery pack is required. Experience working on high voltage battery system is preferred.
• Battery Pack Certification support: Assist in gathering data for certification and cell/pack level abuse testing. Experience in system design to support customer to achieve battery pack level design certification, including but not limited to UN38.3, IEC62133, RTCA DO-311A, or EASA certification. Lead project and work with responsible test houses and advisory board to improve battery pack design.

• Battery thermal design troubleshooting and support: Experience in troubleshooting techniques of battery thermal performance. Support on both functional (performance prediction) and dysfunctional (Thermal runaway) evaluation of battery pack.

Project Coordination

• Timeline Management: Maintain and update cell samples and pack building qualification schedules, flagging potential delays to the account manager.
• Feedback Loop: Document pack qualification feedback and cell-to-pack quality issues, ensuring customer concerns are channeled back to the R&D and Quality teams for resolution.

Requirements

• Education: BS, MS, or ME degree in Mechanical, Electrical, Materials Science, Chemical Engineering, Manufacturing engineering, Integration engineering (or a related STEM field).
• Experience: 5+ years of relevant professional experience.
• Battery Fundamentals: Understanding of Lithium‑ion battery chemistry, charging profiles, and safety protocols. Experience in technical product management within the battery, electric vehicle, aero‑astro, drone, or consumer electronics sectors required. Knowledge of lithium‑ion cell design, cell manufacturing, cell assembly, and cell electrochemical performance testing is a plus.
• Analytical Skills: Strong ability to parse technical data and use Excel or similar tools for performance modeling. Experience with cycling test systems including Arbin, Neware, Chroma is a plus.
• Prototyping: Familiarity with battery failure analysis and teardown at pack/cell level is required. Hands‑on experience building mechanical and/or electrical systems is preferred, including machining, mechanical manufacturing, sheet metal fabrication and welding.
• Reliability and battery safety knowledge: experience in pack reliability performance evaluation is preferred. Capability to build required test setups and integrate system tools for metrology measurement is required. Experience in battery management system design to ensure battery safety and prevent misapplication in the field is required. Knowledge of battery system design consideration to mitigate thermal runaway risk is preferred.

Competencies

• Eagerness to Learn: A fast learner who can quickly grasp the nuances of "Cell-to-Pack" integration and thermal management.
• Communication: Ability to write clear technical reports and communicate effectively with both internal teams and external partners.
• Detail Oriented: High level of accuracy in tracking validation schedules and technical specifications

Physical demands and working conditions

• Travel requirement: This role is based in our Fremont office and involves regular collaboration with partnered companies. Some travel (up to 25%) is required to visit external testing partners or manufacturing partners, attend industry events and conferences, or support account managers at trade shows.

Benefits

• Comprehensive compensation package includes base salary. Salary range for this role is $130,000 to $165,000. Base salary will be determined based on knowledge, experience, and education.
• Health benefits include medical, dental and vision coverage. Medical options of HMO and PPO plans.
• Employer‑funded Health Reimbursement Account (HRA). HSA compatible Medical Plan, FSA Options.
• Pet Health Insurance (dog & cats).
• Traditional and Roth 40l(k) Plans.
• Generous vacation leave starts with 3 weeks annual accrual. 10 paid holidays. Sick time off.
• Cell phone reimbursement.

Amprius Technologies is committed to promoting an equal employment opportunity workplace environment and is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expressions, pregnancy, age, national origin, disability status, genetic information (GINA), protected veteran status, or any characteristic protected by law. The Company’s policy is to recruit, hire, train, promote, and administer all employment‑related matters based on an individual’s qualifications, abilities, and efforts without regard to protected status.