I’m a backend engineer at MUSINSA, a fashion e-commerce platform with 10 million DAU. I strive to build stable and scalable services for users based on my years of experience.

Experience #

MUSINSA (Dec 2022 - Present) MUSINSA is a leading fashion e-commerce platform in Korea with 10 million Daily Active Users (DAU).

• Creator Marketplace (Jul 2024 - Present): Rapidly launched an MVP for a new service connecting influencers and brands. Led operational efficiency and service expansion through continuous feature enhancements and automation. Optimized the content production pipeline, achieving cost savings and building a service structure capable of large-scale expansion.
• Release Board System (Mar 2024 - Jun 2024): Designed and developed a new ‘Release Board’ system, a core content feature on MUSINSA’s main page. Implemented a large-scale notification system targeting users and developed a React-based Admin UI to enhance operational efficiency.
• Legacy System Modernization (Sep 2023 - Mar 2024): As part of MUSINSA 2.0, led the service architecture transition. Successfully migrated a PHP-based legacy system to Kotlin and modularized it, improving maintainability and development productivity.
• FashionTalk Development & Operation (Dec 2022 - Sep 2023): Participated in the entire lifecycle of the ‘FashionTalk’ community service, from planning and MVP launch to enhancement and operation. Improved service quality and stability by building an Elasticsearch-based search system, enhancing CI/CD pipelines (introducing GitHub Actions, ArgoCD), and adopting a Kafka-based Event-driven Architecture.

SALDA (May 2021 - Sep 2022) SALDA was a PropTech company that provided an app service called “Jalsalabo M” for apartment residents. The service is no longer operational.

• Responsible for backend development of convenience services for apartment residents and facility management services for management offices.
• Visitor Car Reservation System: Developed a visitor car reservation system based on Kotlin and Spring Boot. Integrated with external parking barrier control APIs and improved the system to be resilient to external system failures.
• Introduced Testing Culture: In a project lacking test code, wrote over 100 unit and integration tests using JUnit5 and Mockk, significantly improving code stability.

Skills & Interests #

• Key Skills: Kotlin, Spring Framework (Boot, MVC, WebFlux), JPA, Elasticsearch, Kafka, MySQL, CI/CD (GitHub Actions, ArgoCD)
• Architecture: Event-Driven Architecture, Microservices, API Design
• Interests:
  • Large-scale traffic handling and distributed system design
  • Data-driven recommendation systems and search quality improvement
  • Test automation strategies and development productivity tools
  • Learning new technology trends and in-depth application of existing knowledge

About homebrewlab Blog #

“I try not to forget that what I’ve learned is just a small and superficial part. New technologies are good, but I believe it’s also important to reflect on what I already know or thought I knew. I want to share what I newly discover in that process through this blog. Just as I learn a lot from discussing problems with colleagues and seeing diverse perspectives, I hope this space can also be a place to learn and grow together.”

Previously, I maintained a blog at coco-log.tistory.com, where I have written over 200 posts since 2020, sharing my learning journey and insights.

homebrewlab is my new small lab and a space for recording my learning process, practical experiences, and various thoughts. I plan to freely include not only technical knowledge but also the concerns and growth process I experience as a developer, and reflections on various topics.

• Wiki: Technical documents, concept summaries, learning notes
• Tech Posts: Sharing practical experiences, problem-solving processes, tutorials
• Essays: Development culture, personal thoughts, retrospectives

Contact #

• GitHub: eejihoon
• LinkedIn: jihoon-lee
• Email: moradulee@gmail.com

Thank you for visiting! I hope the posts here can be of some help or inspiration to you. If you have any questions or stories to share, please feel free to contact me anytime.