👋😊 Hi there, I’m Ungi Kim

💡 Interest

Building scalable backend systems, optimizing big data pipelines, and improving developer experience for global platforms

Mar 2022 – Present, Seoul, Korea

Led product development and continuous improvement for game platform administration and operations

Key Impact:

Led product planning, technical direction, and team execution for gaming business operations tooling
Executed server and data center relocation, including development, monitoring, and failure resolution
Managed procedural changes and compliance requirements across products
Maintained and improved internal libraries used across platform services

Tech: Backend infrastructure, operational tooling

Feb 2020 – Mar 2022, Tokyo, Japan

Built scalable authentication and payment systems for game platform services

Key Impact:

Designed multi-platform token system to improve authentication reliability
Enhanced shared storage library used across infrastructure
Delivered subscription payment system enabling revenue streams for game developers

Tech: Authentication systems, storage libraries, payment integration

May 2016 – Nov 2019, Seoul, Korea

Built backend services and data infrastructure for True Balance, a fintech app serving millions of users during the company’s Balance Hero period

Key Impact:

Designed and scaled batch processing pipeline for 10M+ users’ financial data
Created self-service PySpark aggregation framework, improving analyst productivity by 70%
Developed custom Athena interpreter for Zeppelin to enable interactive data exploration
Designed and implemented event-driven promotion engine for high-volume user campaigns
Built user management microservice supporting millions of concurrent fintech users

Tech: PySpark, AWS Kinesis, AWS Athena, Apache Zeppelin, ETL pipelines, event-driven architecture, microservices

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

Mar 2009 – Feb 2016

Bachelor of Computer Science and Engineering

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