# Packaging Engineer- Materials at Volantis Semiconductor, Inc.

Packaging Engineer- Materials at Volantis Semiconductor, Inc. in Hybrid Remote/SF Bay Area/Austin/Boston. Hybrid. Posted July 24, 2026.

- Company: Volantis Semiconductor, Inc.
- Location: Hybrid Remote/SF Bay Area/Austin/Boston
- Workplace: Hybrid
- Posted: 2026-07-24
- Apply: https://job-boards.greenhouse.io/volantissemiconductorinc/jobs/4330706009
- Source: https://jobmagic.ai/jobs/packaging-engineer-materials-volantis-semiconductor-inc-1r5h8t

## Requirements

- Drive underfill process development including capillary underfill (CUF) dispense strategies, flow

## Description

We’re looking for a hands-on process and materials engineer to own wafer level molding and underfill processes, material qualification, and assembly integration across development and manufacturing.

 

**Summary:**

Seeking an experienced engineer to lead wafer level mold and underfill process development for advanced semiconductor packages (fan-out wafer level packaging, 2.5D/3D, chiplet). This role spans

mold compound and underfill material selection and qualification, wafer level molding and encapsulation processes, underfill dispense and cure, reliability, failure analysis, and cross-functional support through package and system productization.

 

**Core Responsibilities:**

- Develop and optimize wafer level molding processes including compression molding, transfer

molding, and mold underfill (MUF) for fan-out and advanced heterogeneous packages.

- Own mold compound and underfill material selection and qualification, including evaluation of

filler content, CTE, modulus, Tg, viscosity, and moisture uptake to meet thermo-mechanical and

reliability requirements.

- Drive underfill process development including capillary underfill (CUF) dispense strategies, flow

and void optimization, and cure profile development for high-density flip chip and chiplet

assemblies.

- Evaluate and mitigate assembly risks including warpage, delamination, void formation, bleed-out,

mold flash, and filler settling; define process windows and controls to ensure repeatable yield

across wafer and panel formats.

- Collaborate with OSATs and material suppliers to qualify mold and underfill materials, define

dispense and cure equipment requirements, and manage process transfers into production.

- Lead characterization of mold and underfill material properties (viscosity, gel time, cure kinetics,

adhesion, CTE, modulus) and correlate material behavior to process outcomes and package

reliability.

- Work closely with thermal mechanical modeling teams to model solder joint reliability of bump

interconnects with various underfills and predict warpage with various mold compouds.

- Support reliability qualification including thermal cycling, drop, mechanical shock, and power

cycling.

- Work cross-functionally with design, reliability, thermal, and manufacturing teams to ensure

robust package performance from concept through high-volume production.

 

 

**Required Technical Skills:**

- Strong experience in wafer level molding and underfill processes for advanced semiconductor

packages including fan-out wafer level packaging (FOWLP), 2.5D, and chiplet architectures.

- Deep understanding of mold compound and underfill material science including epoxy resin

systems, filler particle size and loading, cure chemistry, and how material properties drive

thermo-mechanical package behavior.

- Experience with underfill dispense techniques (capillary, no-flow, mold underfill), flow and void

characterization, bleed-out control, and cure process optimization including staged and snap

cure profiles.

- Understanding of thermo-mechanical behavior driven by mold and underfill materials including

CTE mismatch, warpage evolution through cure and reflow, delamination driving forces, and

material-induced reliability risks.

- Hands-on experience with failure analysis of mold and underfill failures including cross-sections,

SEM/EDS, CSAM, TGA, DSC, and DMA for material characterization and thermal cycling reliability

evaluation.

- Ability to work with OSATs and material suppliers to develop, qualify, and transfer mold and

underfill processes into production, including equipment setup and process control plans.

- Strong problem-solving skills with ability to debug mold and underfill yield and reliability issues in

manufacturing environments, including DOE-driven process optimization.

 

 

**Preferred / Differentiating Skills:**

- Experience underfill materials for III-V or photonics packaging including optically clear

encapsulants and low-modulus underfills.

- Experience with mold and underfill integration in advanced packaging architectures including

2.5D interposers, 3D stacking, chiplet assemblies, and CoWoS-like structures where material

interactions and warpage are critical constraints.

- Familiarity with a broad bill of materials for advanced packaging encapsulation including clear

adhesives and underfills for photonics, high-filler, low-CTE mold compounds for 2.5D interposer

assemblies.

- Experience developing mold and underfill solutions for high-power or high-TDP devices where

material thermal conductivity, warpage stability, and coefficient of thermal expansion are tightly

constrained.

- Exposure to thermo-mechanical modeling or collaboration with simulation teams for warpage

prediction, delamination risk assessment, and material property sensitivity analysis for mold and

underfill optimization.

- Understanding of system-level interactions (TIM application and cold plate interaction with wafer

level molded wafer).