Senior Applications Engineer (Android) @ Rakuten Group, Tokyo 🇯🇵 ex-Rakuten Taiwan · ex-Google · ex-HTC

📍 Tokyo, Japan | 🇹🇼 Originally from Kaohsiung, Taiwan | 🗣️ Chinese (native) / English (TOEIC 885) — working in English, not yet fluent in Japanese 🛂 Valid Japan work visa (Engineer/Specialist in Humanities/International Services), issued 2025/08/01, 5-year term — no visa sponsorship needed

Live resume → · LinkedIn · Email

Rakuten Group — Senior Applications Engineer (Android) Aug 2025 – Present · Tokyo Own core Android development for Rakuten Rebates, driving end-to-end delivery and app stability in a high-scale e-commerce environment.

• Enforced Branch Protection & standardized code review across internal and vendor engineers
• Led modular architecture refactor (MVVM/MVI) to decouple legacy code and keep a high crash-free rate through frequent spec changes
• Improved automated testing / static analysis pipelines, streamlining CI/CD and cutting debugging turnaround

Rakuten Taiwan — Lead Android Engineer Jan 2024 – Aug 2025 · Taipei

• Implemented Rakuten ID SDK integration across Rakuten Taiwan, Rakuten Mart, and Zenkokusuper apps; modularized and shared the SDK across ECMPD apps, cutting dev cost and duplication
• Integrated Rakuten Push SDK as part of the ID SDK migration
• Set up Bitrise CI/CD for Zenkokusuper — automated build/test/deploy to Firebase App Distribution across multiple app variants
• Built custom Gradle Convention plugins to manage multi-SDK / multi-variant build configs
• Collaborated with Tech Lead in Tokyo on architecture decisions; mentored junior Android developers

Rakuten Taiwan — Senior Software Engineer Jul 2020 – Dec 2023 · Taipei

• Maintained & developed Rakuten Zenkokusuper and Rakuten Mart / Seiyu Netsuper (Japan) — Kotlin, Jetpack Compose, Hilt/Dagger, Rakuten internal SDKs, KARTE, Adjust; worked daily with Tokyo & India offices in English
• Maintained & developed Taiwan Ichiba and Rakuma Taiwan (C2C flea market app) — migrated Java → Kotlin/Coroutines, adopted Jetpack Compose, applied MVVM, migrated Support Libraries → AndroidX
• Set up unit testing with Robolectric, Mockito, MockK; used Retrofit for networking

NUWA Robotics — Android Software Engineer Nov 2019 – Jun 2020 · Taipei

• Built the Android app/framework for the Kebbi robot: Nuwa Store, Robot Theater, Nuwa Player
• Founded Micro Coding, a Blockly-based coding app for kids
• Founded Nuwa Backup & Restore, a backup transport to the Nuwa Server

Google — Software Engineer (L3) Jan 2018 – Oct 2019

• Developed Android apps for Pixel 3 → Pixel 4, working across MTV and London offices
• Founded Pixel Tips (preloaded on Pixel 3+; "Strongly Exceeds Expectations" 2019 year-end review); also worked on Pixel Recorder
• Android Lifecycle/ViewModel, Protobuf, Gerrit/Git/Repo code review, Gradle & Blaze builds

HTC — Senior Software Engineer Jun 2015 – Jan 2018

• Developed Android apps for HTC Sense 7 → 10
• Founded Edge Launcher (Edge Sense wheel panel on HTC U11/U11+); built HTC Sense Themes and Home screen/Launcher; contributed to BlinkFeed
• Focus areas: RecyclerView, software architecture, performance tuning, debugging

LeadThink — App Developer Jul 2014 – Jun 2015 · Taipei

• Designed & built travel-planning Android apps: own-brand travel app, 統一渡假村App (founder), GO旅報 (founder)
• Software architecture and database schema design

Side project — 臺北科大校園生活 Taipei Tech App Personally designed and built end-to-end (UI, features, release); campus events, class schedule, calendar, credit calculator. Published solo on Google Play.

Languages: Java · Kotlin · SQL · XML · JSON · Protobuf Android: Jetpack Compose · Lifecycle / ViewModel · LiveData · RecyclerView · ConstraintLayout · Paging · Hilt / Dagger · AndroidX Networking/Testing: Retrofit · OkHttp · Robolectric · Mockito / MockK Build/CI: Gradle (incl. Convention Plugins) · Bazel/Blaze · Bitrise · Jenkins · AppCenter · Firebase App Distribution Other: Git / Gerrit / Repo · Google code style & review culture

National Taipei University of Technology (NTUT) — B.S. Computer Science and Information Engineering, 2010–2014

Volunteering with dogs & cats, chasing UFO-catcher figures (working on a Frieren collection)