👋😊 Hi there, I’m Ungi Kim

💡 Interest

Building scalable backend systems, optimizing Big Data pipelines, and improving developer experience in global platforms

Mar 2022 – Present, Seoul, Korea

Led Admin/Operation product development and improvements for global platform services

Key Impact:

Product planning, technical direction, and team leadership for Admin/Operating systems
Executed server/data center relocation with comprehensive development, monitoring, and failure resolution
Managed procedural changes and compliance across all products
Redesigned core platform features improving internal customer experience

Tech: Backend infrastructure, operational tooling

Feb 2020 – Mar 2022, Tokyo, Japan

Built scalable authentication and payment systems for global platform services

Key Impact:

Designed multi-platform token system improving authentication reliability
Enhanced shared storage library serving infrastructure-wide usage
Delivered subscription payment system enabling revenue streams for game developers

Tech: Authentication systems, storage libraries, payment integration

Feb 2017 – Nov 2019, Seoul, Korea

Built and optimized big data pipeline infrastructure processing millions of daily financial transactions

Key Impact:

Designed and scaled batch processing pipeline handling 10M+ user financial data
Created self-service PySpark aggregation framework improving analyst productivity by 70%
Developed custom Athena interpreter for Zeppelin enabling interactive data exploration

Tech: PySpark, AWS Kinesis, Apache Zeppelin, AWS Athena, ETL pipelines, big data processing

May 2016 – Feb 2017, Seoul, Korea

Built scalable backend services for True Balance, a fintech app serving millions of users

Key Impact:

Designed and implemented event-driven promotion engine handling high-volume user campaigns
Built user management microservice supporting millions of concurrent fintech users
Architected scalable backend infrastructure for real-time financial data processing

Tech: Event-driven architecture, microservices, backend systems, fintech platforms

Dec 2015 – Feb 2016, Seoul, Korea

Apr 2010 – Feb 2013, Seoul, Korea

Developed e-commerce platforms for major Korean retail websites

Key Impact: Built and maintained GEOPASS and eBay Auction e-commerce systems

Tech: E-commerce platforms, web development

“Data Engineering 101” @ Kodeveloper Struggle #39, CUK Special Lecture (materials)
“Simplify Data Processing” @ DatayaNolja 2018 (materials)
Featured in LINE Careers “Meet the Global LINERs”