Staff Manufacturing Process Engineer - Battery Cell Assembly

Amprius Technologies (NYSE: AMPX) is a leader in high-energy, high-power lithium-ion batteries built on silicon anode technology. Our SiCore® and SiMaxx™ cells power unmanned aerial systems, aviation and other applications where weight and energy density matter most. Headquartered in Fremont, California, Amprius designs cells in house and produces them through a global network of contract manufacturing partners.

Amprius Technologies is hiring hands-on Manufacturing Process Engineers Staff level, to join our Manufacturing group in Fremont, CA. The engineer will own the process parameters, first-pass yield, and throughput of a group of lithium-ion cell-assembly stations — front-end assembly (electrode notching, stacking, and tab welding) or back-end assembly (pouch forming, sealing, electrolyte fill, and degas) — with station assignments based on experience. You will join as we bring new pilot-line equipment online and ramp it to full production rate. These are highly visible roles reporting to the Pilot Line Manager.

Within your first year, you will own first-pass yield and overall equipment effectiveness (OEE) for your stations, have released qualified process windows, control plans, and SOPs for each, and have delivered measurable yield and cycle-time improvements that show up in the line's output.

· Key role in lithium-ion cell manufacturing.

· Own process parameters for your assigned cell-assembly stations: develop recipes, define and qualify process windows, and maintain process specifications and control plans.

· Design and run structured experiments (DOE) to optimize parameters against yield, cycle time, and cell performance, and release the results as specifications, SOPs, and operator training.

· Own first-pass yield and scrap at your stations: build defect Paretos, lead root-cause investigations (8D, 5-Why, fishbone), and drive corrective and preventive actions to closure.

· Drive throughput: measure OEE and cycle time, identify bottlenecks, lead line-balancing and changeover-reduction efforts, and quantify the capacity gained.

· Implement SPC and in-line inspection on critical process parameters, and set up data collection (tool logs, MES) so yield and throughput are visible by station, product, and shift.

· Lead PFMEAs and control plans for new or changed processes, and qualify changes with capability studies (Cpk, Gage R&R) before release to production.

· Partner with equipment vendors, maintenance, and controls engineering to resolve tool issues that limit yield or uptime; support FAT/SAT and new-tool introduction as needed.

· Write and maintain SOPs and work instructions; train and mentor technicians and operators.

· Support daily production: troubleshoot process excursions, disposition nonconforming material, and respond to off-shift escalations when needed.

· Apply lean and Six Sigma methods to continuous improvement across the assembly line, and champion safe handling of electrolyte, lithium-ion cells, and dry-room operations.

· Work with R&D engineers to develop new processes for new products.

· Maintain active role on internal continuous improvement.

· Mentor and supervise lab technicians as required.

· BS in Mechanical, Chemical, Materials, Industrial, or Electrical Engineering, or a related field; advanced degree a plus.

· 8+ years of process or manufacturing engineering experience in lithium-ion cell production or comparable precision manufacturing, including hands-on ownership of cell-assembly processes.

· Hands-on experience running, tuning, and qualifying cell-assembly equipment such as electrode notching or slitting, stacking or winding, ultrasonic or laser tab welding, pouch forming and sealing, electrolyte filling, and degassing.

· Demonstrated yield or throughput improvements you owned end to end — from data analysis and root cause through implementation and sustained results.

· Proficiency with DOE and statistical analysis (JMP, Minitab, or equivalent), SPC, PFMEA, and measurement system analysis (Gage R&R).

· Working knowledge of how assembly parameters and defects (alignment, weld quality, seal integrity, moisture ingress, contamination) affect lithium-ion cell performance, safety, and yield.

· Takes initiative, works with minimal supervision, and takes ownership of critical projects; collaborates well with technicians, operators, and cross-functional engineers.

· Clear written and verbal communication, including the ability to write SOPs and present data-driven recommendations to leadership.

· Able to work in a dry room and on the production floor daily; committed to environmental, health, and safety requirements.

· Pouch-cell assembly experience; exposure to silicon-anode or other next-generation chemistries.

· Experience with MES and with tool-data extraction and analysis (Python, SQL, or similar).

· Six Sigma Green Belt / Black Belt or equivalent lean certification.

· Experience bringing new equipment or a new line from FAT/SAT through ramp to production rate.

· For Staff level: experience mentoring engineers and leading cross-functional improvement programs.

· On-site in Fremont, CA, primarily on the production floor and in the dry room with some desk and computer work.

· Must be able to lift up to 25 pounds at a time.

· Works with lithium-ion cells, electrolyte, and solvents under established safety controls.

· Occasional off-shift or weekend support for production escalations