Sr 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 (Senior or Staff level, depending on experience) 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.
• · Senior: 5+ years / Staff: 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,…