Senior/Staff Process Engineer (Flip Chip)

Singapore · 5+ years experience · Full-time · Posted Oct 8, 2026

At a glance

Lumilens is seeking a Senior/Staff Process Engineer to own process development and technical support of the Flip Chip process for silicon photonic chip wafers.
The role involves characterizing process windows, optimizing process integration, evaluating manufacturing raw materials, and managing quality control.

Owns the process development and technical support of the Flip Chip process for silicon photonic chip wafers, with OSAT or internal line.
Perform DOE to characterize process window and margin and optimize process integration with upstream processes to increase yield and manufacturability.
Material Characterization & Selection: Evaluate and qualify new manufacturing raw materials, including NCP, flux, underfill etc, as applicable.
Design and execute DOE plans to characterize thermal and mechanical stress and lead reliability validations including Temperature Cycling Test (TCT), Unbiased Highly Accelerated Stress Test (HAST) and High-Temperature Storage (HTS).
Failure Analysis & Debug: Own the root-cause diagnostics of structural failure modes unique to FC and formulate improvement solutions.
Manage incoming material quality control, establish SPC control plans and monitor process variation to ensure long-term process stability.
Compile process SOP, WI, process failure reports and engineering change documents; support NPI new product introduction and process verification.

Bachelor or Master degree in Materials Science, Chemical Engineering, Mechanical Engineering, Microelectronics, or an equivalent technical discipline.
5+ years of hands-on industry experience in flip chip assembly.
Deep practical understanding of plasma cleaning, flux engineering, pick & place, reflow, underfill, curing and/or TCB/NCP flux-less flow.
Comprehensive command of finite element simulation principles regarding warpage, thermal dissipation, and structural mechanical integrity.
Solid working expertise with industry validation methodologies including FMEA, SPC controls, and structured 8D problem-solving tools.
High proficiency with robust analytical platforms like JMP, Minitab.