IC Package FEA Engineer

Lumilens • San Jose, CA

1d

About The Position

At Lumilens, we are redefining the optical layer that powers tomorrow’s AI and high‑performance computing. We are seeking an experienced IC Package Mechanical FEA Engineer to help drive the next generation of high‑performance packaging solutions for advanced ASICs.
In this role, you will join a globally distributed R&D organization developing mechanical designs that enable cutting‑edge systems for AI, networking, HPC, and 5G infrastructure. You will work hands‑on with emerging packaging and photonic‑integration technologies, including co‑packaged fiber‑optic transceivers, novel optical connectors, and complex chip‑stacking approaches such as 3DIC, hybrid copper bonding, and heterogeneous integration.
You will design, model, and optimize advanced multi‑chip‑module (MCM) architectures and mainstream flip‑chip BGA (FCBGA) packages to support Lumilens’ high‑speed photonic engines. Collaboration is central to this role: you will partner closely with R&D, manufacturing, and reliability teams to influence ASIC mechanical design from the earliest stages. Your engineering decisions will directly impact warpage, stress, reliability, cost, and overall thermal and electrical performance, ultimately shaping the photonics infrastructure that fuels future AI supercomputing.

Requirements

• Bachelor’s in Mechanical Engineering (or related field) with 12+ years FEA experience, Master’s with 10+, or PhD with 7+.
• Deep expertise in advanced packaging technologies, including flip‑chip, FOWLP, 2.5D/3D integration, chiplet architectures, and TSVs.
• Strong understanding of materials behavior across polymers, metals, ceramics, and their thermo‑mechanical interactions.
• Familiarity with semiconductor packaging processes such as die attach, underfill, molding, bumping, and reflow.
• Proficiency with FEA tools, including Ansys Classic/Mechanical and Abaqus.
• Ability to interpret and correlate complex simulation results using first‑principles mechanical engineering concepts.
• Demonstrated experience calibrating models with empirical data, including hands‑on mechanical testing and metrology.
• Proven capability in developing and running lab‑level experiments to validate simulations and identify root causes.
• Strong judgment in balancing manufacturing constraints, reliability requirements, and performance needs.
• Excellent self‑management, organizational discipline, and ability to thrive in a fast‑moving environment.
• Comfortable collaborating with global, cross‑functional engineering teams and external vendors.
• Strong presentation, communication, and technical documentation skills.

Responsibilities

• Perform FEA simulations to evaluate stress, strain, warpage, delamination, thermal cycling, and reliability risks across advanced package architectures (flip‑chip, fan‑out, 2.5D/3D IC, chiplet‑based, TSVs).
• Define simulation requirements, analyse results, and deliver actionable design and process recommendations.
• Support technology road mapping by assessing new materials, interconnect structures, and process flows from a thermo‑mechanical reliability perspective.
• Lead DOE studies and sensitivity analyses to identify key reliability and performance drivers.
• Collaborate with cross‑functional teams (design, photonics, manufacturing, reliability, vendors) to ensure robust, scalable package architectures.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level