# Technical Support Engineer (Package Substrate) Bilingual in Korean

> Cesna Recruitment · Cupertino, United States · Full-time · Posted 2026-10-29

**Workplace:** on_site

## Description

1) Main Responsibilities

\- Provide technical support for customer development programs (Mobile AiP, SiP, FC-CSP, RF).

\- Resolve technical issues and drive performance stabilization at the customer.

\- Identify and develop PoC opportunities through customerengagement.

\- Guide BOM and substrate structure selection using LGIT technicalsolutions.

\- Lead design reviews, TRA assessments, yield improvement, and production readiness.

\- Coordinate between customer engineering and LGIT R&D, Process,Quality, and Manufacturing. 

2) Others

\- Conduct regular customer meetings and technical presentations.

\- Collect customer VOC and market intelligence to shape technology roadmaps.

\- Support technology promotions, exhibitions, and strategic customer engagements.

\- Promote advanced substrate technologies (Hybrid Stack-up, Fine Pattern, Cavity, Hyper Flex).

## Requirements

\- Bachelor's degree or higher in Engineering, Materials Science, Chemistry, or a related field.

\- Bilingual in both English and Korean

\- - 10+ years in package substrate development, process or customer engineering, or technical marketing.

\- Proven record of leading substrate projects through mass production.

\- Experience supporting major semiconductor customers preferred.

\- Deep knowledge of substrate processes, materials, structures, and design rules.

\- Hands-on experience with ABF, ETS, Hybrid Stack-up, Cavity, Fine Pattern, and RF.

\- Ability to translate customer requirements into technical solutions.

\- Experience in NPI, yield improvement, and production transfer.

\- Strong customer relationship management skills.

\- Clear technical presentation and communication skills.

\- Project management and problem-solving capability.

\- MS Office (PowerPoint, Excel, Word).

\- Six Sigma Green Belt or equivalent preferred.

\- PMP or equivalent project management certification preferred.

Travel: 

\- On-site customer support with frequent customer engagement.

\- Frequent travel to customer sites within the U.S.

\- Periodic travel to Korea for engineering and business reviews.

## Apply

[Apply at Cesna Recruitment](https://apply.workable.com/cesna-group-2/j/32C6D8807E/apply)

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