Senior/Staff Process Engineer (Wafer Dicing & Back-grind)

Uncover; San Jose, Northern (CA, KY); Hybrid; USD 120,000 - 190,000; Full time

Job summary

Lumilens in San Jose, CA seeks a Senior/Staff Process Engineer to drive wafer backside grinding/thinning, stealth dicing, and die sorting for silicon photonic chips. You will optimize grinding, cutting paths, and laser parameters to protect optical structures and maximize yield.

You will collaborate with suppliers and internal teams, develop SOPs, support NPI, and troubleshoot process abnormalities across front-end and assembly integration.

Qualifications

• Education as stated: Bachelor's or Master's in relevant technical field.

Responsibilities

• Optimize wafer thinning thickness, grinding speed, and laser parameters to avoid cracks and edge chipping.

Skills

Wafer dicing

Wafer thinning

Grinding

Process engineering

DOE matrix

SPC data analysis

Education

Bachelor's or Master's in Materials Science / Chemical Engineering / Mechanical Engineering / Microelectronics

Tools

SPC

JMP

DOE

Job description

# Senior/Staff Process Engineer (Wafer Dicing & Back-grind)Lumilens • San Jose, CA • • 2h agoSave this role or tell us whether you want more jobs like it.**Core Responsibilities*** Responsible for silicon photonic wafer backside grinding/thinning process, laser stealth dicing process and die sorting development for silicon photonic chips, with OSAT or internal line.* Optimize wafer thinning thickness, grinding speed, cutting path and laser cutting parameters to avoid chip crack, edge chipping and optical structure damage of silicon photonic wafers.* Solve process abnormalities in wafer thinning and dicing processes, including wafer warpage, surface scratch, incomplete cutting and chip breakage.* Monitor wafer thickness uniformity, cutting quality and production capacity, carry out continuous process optimization to improve product yield.* Evaluate process compatibility between wafer grinding/stealth dicing and bumping & flip-chip processes, optimize process integration to avoid subsequent process failure attributed to front-end process variations.* Compile process SOP, WI, failure reports and engineering change documents; support NPI new product introduction and process verification.**Key Requirements & Qualification*** Education**:** A Bachelor or Master degree in Materials Science, Chemical Engineering, Mechanical Engineering, Microelectronics, or an equivalent technical discipline* Experience: 3 to 6+ years of hands-on process engineering in wafer mounting, wafer dicing, wafer thinning or grinding, especially in handling advanced packaging wafers with more complex topology or stack* Experience working with external equipment and material suppliers to develop equipment and materials needed to support new assembly requirements. Characterize, qualify and bring the process up for mass production* Familiarity with SPC, JMP data analysis, and DOE matrix design for process development and problem identification and solving using meticulous fixing methods