Android Developer | 2018~

I studied Korean Literature and Mathematics, dreamed of becoming a musician, and then became a developer. These fields may seem different, but they share one thing in common: they are all languages. I believe code is written for humans to read, not for computers. I write readable code to communicate with developers, and I'm known for communicating clearly with non-developers as well.

• Email: hevinxx@gmail.com
• GitHub: github.com/hevinxx
• Blog: hevinxx.github.io

• Platform: Android
• Language: Kotlin
• Libraries & Frameworks: Jetpack Compose, RxJava, Coroutines, Hilt, Retrofit2, Glide
• Architecture: MVVM

• Platform: Flutter
• Language: Java, Scala, JavaScript, TypeScript, Python, Dart
• Libraries & Frameworks: Koin, Coil, Jetpack Navigation, Socket.IO, React Native, Node.js, Express, Sequelize, Chai, Spark
• Architecture: MVP, MVI
• DB: PostgreSQL, Firebase Realtime Database, Room, Realm
• Infra: AWS, Docker

Android Developer | May 2023 - Present

Android development for 'Babitalk', a plastic surgery platform app.

• Motion Banner Development: Implemented custom animations on hospital-uploaded images to maximize ad effectiveness.
• VisibilityTracker Open Source Library: Developed and open-sourced a library that accurately measures banner visibility in nested scroll environments. Designed and implemented a solution that didn't exist in the Jetpack Compose ecosystem at the time.

• Jetpack Compose Migration: Successfully completed a year-long migration to Jetpack Compose.
• Multi-Module Architecture: Currently working on modularizing the app architecture.

• Rapidly learning and sharing knowledge about the latest AI tools with team members.
• Internal Presentations: 'AI Code Editor Cursor Review', 'MCP Trial and Error', 'Spec Driven Development', etc.
• Figma MCP Improvement Project: Led an open project to improve client app development productivity using Figma MCP.
• Celebrity Look-alike Feature with SDD: Participated in developing an AI-based facial analysis feature using Spec Driven Development.

Android Developer (Solo) | Feb 2022 - Jan 2023

Sole Android developer for 'Mealigram', a diet tracking app, responsible for all Android-related work.

• Google Play 2022 Best Self-Improvement App Award (received during tenure)
• Achieved #1 ranking on both App Store and Google Play in the Korean diet tracking category.
• Diet/Exercise Data Sharing Feature: Developed a feature that compiles user's diet and exercise data into three types of shareable images. Experimentally introduced Jetpack Compose for this feature.

Android Developer | May 2019 - Jan 2022
Data Engineer | Nov 2018 - Aug 2019
Backend Developer | Oct 2018 - Nov 2018

Developed a personalized workout subscription service.

• Onboarding Chatbot: Implemented real-time chatbot using Socket.IO to assess user's fitness level, goal intensity, and exercise experience. Designed conversation flow utilizing data structures such as linked lists and queues.
• Developed personalized workout video and diet information delivery features.
• Built achievement calculation and point reward system based on workout video playback data.

• Internal Data Dashboard: Eliminated the inconvenience of manually requesting data from server developers.
• Built data pipeline based on Apache Spark, visualized through Zeppelin.
• Developed custom Helium library when required graph types were unavailable.

Open Source Library | 2023 - Present

A library that accurately measures item visibility within nested scrolls in Jetpack Compose. Designed and open-sourced a solution that didn't exist in the Compose ecosystem at the time.

Reading Log App | Jan 2023 - Present

A reading log app developed with Flutter. Solo project covering planning, design, development, and operations.

Dating App | Jun 2020 - Mar 2022 (Stopped)

Developed Flutter app and Node.js/TypeScript backend. Implemented real-time chat using Socket.IO.

Hacker News Summary/Translation Service | 2024

A service that summarizes top Hacker News articles, translates them to a configured language, and delivers via RSS. Built with vibe coding.

AI Baby Future Face Prediction | 2024

A web service that predicts a baby's future appearance using AI, based on parents' faces, baby's face, and current age. Built with vibe coding.

Newsletter | maily.so/pepper.note

A newsletter sharing interesting tidbits and hidden gems.

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Before becoming a developer, I pursued music composition.

• 이런 노래
• 끝
• 용건만 간단히
• SoundCloud

Instagram: @hevin_aug7

Creating AI art using ChatGPT and DALL-E.

B.A. in Korean Language & Literature / B.S. in Mathematics — Double Major | 2012 - 2019

Spanish Language Department | 2008 - 2011