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.
• De…