📧 ungi@ungikim.me · github.com/ungikim · Seoul, Korea
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 특강 (materials)
- "Simplify Data Processing" @ DatayaNolja 2018 (materials)
- Featured in LINE Careers "Meet the Global LINERs"
- Korean (Native)
- English (Professional)
- Japanese (Professional)