안드로이드 앱의 안정성과 사용자 경험을 개선해 온 개발자 유진입니다.

기능 구현에 그치지 않고,
서비스가 안정적으로 동작하는 구조, 운영 과정의 비효율, 재발하지 않는 해결 방식까지 함께 고민합니다.

사용자 피드백과 비즈니스 요구사항을 바탕으로 문제를 정의하고,
다양한 직군과 협업하며 실제 서비스의 개선을 만들어왔습니다.

• Strong in Kotlin, Android
• Interested in Backend, Cloud Infrastructure

2025.07 ~ 2025.09 | Android Engineer Intern, Mobility Business

• Built an Android Mock GPS tool for TMAP AUTO debugging
• Improved large driving log parsing performance by 50.6% through buffer tuning, batch processing, and regex simplification
• Designed a Room-based local caching structure for offline scenario replay
• Resolved a Compose-WebView rendering issue by adjusting layoutParams
• Implemented BLE communication for HUD devices using Command Queue and Big Endian byte transfer

Tech Kotlin Compose Multi-Module Build Logic Room BLE Hilt JUnit

2024.09 ~ 2024.12 | Android Engineer Intern

• Developed a virtual e-bike app using BLE GATT Server for product demo environments
• Replaced Thread.join()-based legacy flow with Coroutines, reducing UI blocking from 250ms to 0.5ms
• Ensured stable BLE communication in background with Foreground Service
• Built motivation features including goal setting and achievement rate visualization
• Improved home screen responsiveness by caching data in Datastore and updating in the background

Tech Kotlin XML Compose BLE Service Coroutine

2023.06 ~ 2023.08 | Backend Engineer Intern

• Development of G-Market Payment Details Parsing API
• Implement MongoDB storage logic by processing unstructured HTML/JSON data to common field criteria
• Verified edge cases with Pytest-based TDD
• Experienced pair programming, code review, and collaborative backend development

Tech Python Selenium BeautifulSoup Flask MongoDB

2023.03 ~ Present | Android Developer / Former Team Leader, PM, AWS Infra Operation

A campus meal review service used by 5,000+ users at Soongsil University.

• Improved WAU/MAU from 21.8% to 62.4%
• Built a stable operation workflow with Crashlytics + Slack, resolving 15+ major crashes
• Automated release workflow with GitHub Actions + Fastlane
• Solved JWT refresh Race Condition with Mutex, reducing duplicate refresh attempts to one
• Re-architected legacy code into MVVM + Clean Architecture, with gradual Multi-Module / Compose migration
• Replaced fragmented LiveData states with sealed UiState
• Introduced Firebase Remote Config to reflect restaurant info changes without app updates
• Built a Glance widget and updated menu data in background with WorkManager

Tech Kotlin XML Compose Clean Architecture MVVM Hilt Retrofit Coroutine Flow WorkManager Glance Firebase Fastlane

2025.03 ~ 2025.07 | Android Developer

An AI-based settlement support app for North Korean defectors.

• Reduced voice response latency from 11s to 3s by switching from REST + TTS flow to OpenAI Realtime API with WebSocket
• Reduced unnecessary API calls by 78% using movement thresholds on map center changes
• Designed the project with MVVM + Clean Architecture + Multi-Module
• Built location-based welfare facility features on top of map interactions

Tech Kotlin Compose Navigation Clean Architecture MVVM Multi-Module Hilt Ktor Coroutine Flow Naver Maps WebSocket

2024.07 | Personal Project

An Android-based book registration automation tool built during an overseas volunteer project in Indonesia.

• Automated the flow from ISBN scan → book lookup → Google Sheets save
• Reduced registration time per book from 1 minute to 10 seconds
• Designed the system so non-developers could use it immediately with Google Sheets as DB
• Built a working prototype in a constrained field environment

Tech Kotlin ZXing Google Books API Google Sheets API Apps Script

• K-PaaS Digital Social Innovation Contest — Gold Prize (2nd)
• AI Online Development Competition Syncathon Season 3 — Grand Prize (2nd)
• Soongsil University Software Contest — Gold Prize
• Soongsil Capstone Design Competition — Encouragement Prize

• Speaker: 학교에서 서비스 운영하기
• Speaker: 해외봉사가서 개발하기

• Developed campus community services and design system projects

• Vice Lead of a 50-member university IT club
• Co-hosted the first SSU DEVCON with 6 campus IT clubs and 400 participants

• B.S. in Computer Science, Soongsil University (2021.03 ~ 2025.08)
• 정보처리기사 (2024.12)
• SQLD (2025.12)

• GitHub: https://github.com/HI-JIN2
• Velog: https://velog.io/@jini_1514
• Email: qldls0307@naver.com