- Migrated an application from Heroku to AWS EKS in 6 months, using Terraform for configuration - Integrated Devise gem and switched session storage to Redis, enhancing session management - Implemented event-driven architecture with Wiper gem, improving developer efficiency - Enhanced log formatting by adding user IDs and integrating Lograge gem for better debugging - Analyzed logs and created stress test scripts, executing them with K6 - Planned and delivered version 2.0 of the assignment feature, involving DB relations and code adjustments - Integrated MISO search engine in just 2 months - Upgraded the Rails version from 6.0 to 6.1 within 3 weeks - Optimized user online status updates with a background worker, reducing query volume by 30%. - Introduced ADR to improve the document process - Developed a script to verify if pull requests are deployed, enhancing web developers' efficiency by 0.5%

- Containerized internal web tool and integrated it with ECS in 3 months - Streamlined game data workflow, which reduce engineers’ toil debugging tasks about 3 hours / week - Transitioned internal web tool deployment from Capistrano to a more efficient shell script - Built workflow using Packer, Ansible, and Cfn to build log transfer service(S3 to big query) in 1 month

Fab 12-Sep. 2015 to Jul. 2019 Process engineer, WET department • WET process includes wafer-clean & film etching by chemicals • Reduced SPM process time for cost saving • Improved Wafer-Clean process – Defect improve 21% on products • Involved in the process chemical change for BEOL PRS process • Coordinated with other 5 departments with evaluation of 2nd source chemical filter project in six months • Contributed to 2 TSMC patent ideas, applying for USA patent Fab 15-Mar. 2017 to Sep. 2017 Process engineer, WET department • Volunteer to support new technology N7/N10 ramping up a half year • Released 12 new tools for advanced technology • Prolonged SPM usage count for cost saving & tool available time increase