# Packaging Mechanical Engineer at Density

- Company: Density
- What the company does: Density shows you how people use your space and helps you get more out of every square foot. Backed by Kleiner Perkins and South Park Commons.
- Company website: https://www.density.io/
- Type: Startups (AI role)
- Level: Mid level
- Location: Mountain View, CA
- Work setup: On-site
- Posted: 2026-08-06
- Apply by: 2026-10-08
- Apply: https://job-boards.greenhouse.io/densityai/jobs/4354671009
- Page: https://www.1752.vc/careers/jobs/density-packaging-mechanical-engineer/

## About the role

Own the thermo-mechanical design of the advanced packages our AI accelerator silicon ships in. A multi-die 2.5D package is a stack of materials that all want to expand at different rates, under a lid, under load, cycling through hundreds of watts — and your job is to make it stay flat, stay bonded, and stay intact.

## What they're looking for

- 8+ years of packaging mechanical experience on high-performance designs, including 2.5D / 3D and multi-die packages (CoWoS, EMIB, InFO, fan-out, or equivalent) and HBM-bearing assemblies
- Hands-on with industry-standard FEA tools (Ansys Mechanical, Abaqus, or equivalent) and strong materials knowledge across underfills, mold compounds, substrates, TIMs, and lid materials
- Demonstrated ability to work closely with packaging, thermal, reliability, board, and OSAT partners to converge mechanical designs and sign them off against JEDEC and IPC standards

Tags: Hardware