Sung Jae Lee

(한국어)

Hello.

I am Sung Jae Lee, a developer who loves programming and can write code anytime and anywhere as long as I have my laptop open. I am developing with the hope that the programs I create will make people's daily lives more enjoyable and convenient.

When problems arise, I spare no effort to find the best solution in the given situation. I also organize any cases worth documenting after resolving issues so that they can be referenced in similar cases in the future.

I am particularly interested in development culture and documentation, and I value collaboration with others. I am always striving to be a developer that others want to work with again.

I mainly work with PHP, TypeScript, Golang, Java, Docker, and Linux. I have a keen interest in various fields beyond software engineering, including network operations and security.

Works

  • SeoulVentures Corp. (2020.04~2023.09, Developer)
    AI-based product recommendation, image optimization, and various solutions for shopping malls
    • Developed various internal services for in-house use.
    • Improved the readability of existing legacy code and introduced TypeScript to facilitate future code enhancements.
    • Developed image caching and optimization solutions within the shopping mall.
    • Developed a foundational platform for modular services.
    • Established a sustainable development culture through the introduction of CI/CD, Lint, and PR reviews.
    • Gained experience in handling high traffic with over 1 million daily page views.

Experience

  • Operating personal SNS hosting service “Hotoast” (2024.08~Current)
  • Developing global SNS service “hotomoe” (2023.07~Current)
  • Operating “Arcaism”, the only arcade in Korea with mobile payment support, and developing related software and hardware (2023.01~2023.12)
  • LibreWiki development team (2017.09~Current)
  • Operating self-owned ASN AS399866 (2021.07~Current)
  • Korean Wikipedia Main page development (2019.12)

Open Source Contributions

  • Translated the web hosting control panel “VestaCP”. (2017.09)
  • Participated in the translation of the Discord utility bot “rem-v2”. (2017.02~2017.07)

Other Experiences

  • Developed an Android app that emulates NFC-based user authentication cards. (Private Project)
  • Worked on a project to connect multiple locations to existing third-party networks at a low cost. (Private Project)
  • Reported a security vulnerability CVE-2025-24896. (2025.02)
  • Active member of the Korea Wikimedia Association. (2019.12~Current)
  • Set up a private cloud environment by configuring my own on-premise servers. (2016.01~Current)

Contact and External Links