Senior Package FEA Engineer - Optical IC Packaging

Cspeed; Palo Alto (CA); On-site; USD 140,000 - 190,000; Full time

Job summary

Cspeed IO is seeking an experienced Mechanical Engineer to lead structural FEA for optical engine packages. You will predict warpage through assembly stages and assess interconnect stress, dielectric risk, and fatigue life, collaborating with the photonic design team to ensure optical performance and reliability.

You will define modeling standards, correlate predictions with measurements, and influence stack-up, thickness, bump pitch, and underfill choices to guide architecture decisions and

Qualifications

• MS or PhD in Mechanical Engineering, Materials Science, Engineering Mechanics, or equivalent practical background.
• 6 years of structural FEA for semiconductor packaging, including warpage and interconnect stress analysis on a product carried into build.
• Deep hands-on capability in Ansys Mechanical, Abaqus, or equivalent, including nonlinear material modeling.
• Command of nonlinear and time‑dependent material behavior — creep, viscoplasticity, viscoelasticity, fatigue.
• Working knowledge of solder constitutive models and fatigue life prediction methods.
• Demonstrated correlation against physical measurement, and the judgment to distinguish a modeling error from a process excursion.

Responsibilities

• Predict warpage at each stage of the assembly process using process-sequential modeling.
• Own the flatness, coplanarity, and facet planarity budgets for assembly and optical coupling.
• Analyze stress and strain in micro-bump, copper pillar, C4, and second-level interconnect structures.
• Model solder fatigue life and thermal cycling, shock, and board-level reliability per JEDEC/IPC.
• Quantify stress in the photonic IC and its impact on optical performance with design team.
• Define simulation methodology and provide design guidance with auditable assumptions.

Skills

FEA

Ansys Mechanical

Abaqus

Nonlinear materials

Creep

Viscoplasticity

Education

MS or PhD in Mechanical Engineering or related field

Tools

Ansys Mechanical

Abaqus

Job description

Cspeed IO is seeking an experienced Mechanical Engineer to lead structural FEA for optical engine packages. You will predict warpage through assembly stages and assess interconnect stress, dielectric risk, and fatigue life, collaborating with the photonic design team to ensure optical performance and reliability.

You will define modeling standards, correlate predictions with measurements, and influence stack-up, thickness, bump pitch, and underfill choices to guide architecture decisions and