Software Engineer

Seoul, South Korea

📧 [email protected] | 🌐 https://kyoungwon.me | GitHub: github.com/leegeng

Impact-driven software engineer with over 10 years of experience building scalable backend systems and product-focused features. Strong foundation in high-traffic distributed services, having led development efforts at both large tech companies and startups. Passionate about creating meaningful user-facing products, from idea to production, with a mindset rooted in business impact and autonomy.

Dec 2019 – Present, Seoul, South Korea

• Led the backend development of the flea market feature for Karrot Market, one of Korea’s largest community platforms.
• Improved listing performance and data accuracy across millions of users and listings.
• Contributed to core service architecture and new business features with direct user impact.

Nov 2017 – Nov 2019, Seoul, South Korea

• Built and managed a team of 18 engineers for medical AI products.
• Led backend redesign for Lunit INSIGHT, reducing latency by 40% and improving integration for hospital partners.
• Delivered full-stack features including an in-house annotation tool and deployment system.
• Integrated with Fujifilm REILI platform for global distribution.
• Improved engineering processes by introducing structured workflows (Jira, Confluence, Notion).
• Speaker at DEVIEW 2018: “Data Engineering for Digital Pathology AI”

Sep 2016 – Oct 2017, Seoul, South Korea

• Rebuilt and launched Fund101 (small loan platform) from scratch.
• Developed and maintained multiple web/mobile services (Goodeats, Sirjuseyo, Autoup) under tight startup timelines.
• Delivered critical B2B integrations for prop-tech backoffices and internal sales tools.

Jul 2013 – Sep 2016, Seongnam, South Korea

• Main developer for KakaoTalk’s Notification Center and User Profile backend systems.
• Delivered in-app browser widget and improved SMS reachability with dynamic vendor routing.
• Led A/B testing and UX improvements for KakaoTalk profile feed layout across 10M+ users.
• Proposed and developed foundational components adopted across Kakao services (Brunch, Story, Music).

• DEVIEW 2018 – Data Engineering for Digital Pathology AI
• Startup Job Festival 2019 – Life of a Startup Developer: From Kakao to Lunit

• Backend: Python (Django), Ruby on Rails, PostgreSQL, MySQL, Redis, AWS
• Frontend: JavaScript, React, HTML/CSS
• Others: OAuth2, RabbitMQ, Zookeeper, Git, CI/CD, System Design, Large-scale Architecture

KAIST – M.S. in Web Science and Technology Aug 2013, Daejeon, South Korea

Korea University – B.S. in Computer Science Feb 2011, Seoul, South Korea

DART: An Efficient Method for Direction-aware Bichromatic Reverse k Nearest Neighbor Queries, Proc. of the 13th International Symposium, SSTD 2013, Munich, Germany, August 21-23, 2013.

http://link.springer.com/chapter/10.1007%2F978-3-642-40235-7_17

Ads by Whom? Ads about What? Exploring User Influence and Contents in Social Advertising, Proc. of the ACM Conference on Online Social Networks (COSN 2013), October 2013.

http://dl.acm.org/citation.cfm?id=2512950

DART+: Direction-aware Bichromatic Reverse k Nearest Neighbor Query Processing in Spatial Databases, Journal of Intelligent Information Systems: Volume 43, Issue 2 (2014), Page 349-377

http://link.springer.com/article/10.1007%2Fs10844-014-0326-3

METHOD FOR PROVIDING CONTENT, CONTENT PROVIDING SERVER FOR PERFORMING THE PROVIDING METHOD AND METHOD FOR RECEIVING CONTENT, USER DEVICE FOR PERFORMING THE RECEIVING METHOD, South Korea, 10-2013-0162897, Applied on May 28, 2015

METHOD FOR DISPLAYING WIDGET FOR EXTENSION SERVICE, AND DEVICE FOR PERFORMING THE METHOD, South Korea, 10-2015-0145829, Applied on September 12, 2017

METHOD FOR PRIVACY-SAFE COMMUNITY COMMUNICATION USING MESSENGER BOT SYSTEM, South Korea, 10-2015-0061679, Applied on September 29, 2017

METHOD AND APPARATUS FOR RECOMMENDING PHOTO COMPOSITION, South Korea, 10-2014-0062493, Applied August 25, 2016

어노테이션 작업 관리 방법, 이를 지원하는 장치 및 시스템, South Korea, 10-2018-0137355, Submitted on November 9, 2018