Keishin Yokomaku
Software Engineer at Drivemode
Chiyoda, Japan
Summary
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Rockstar🎓
Top SchoolKeishin Yokomaku is a seasoned Android-focused software engineer with 13 years of experience building and hardening mobile apps, currently contributing at Drivemode and MIXI while shaping Family Album at mixi. A certified Java programmer with a background in UI, graphic design, and web usability, he blends product-minded Android engineering with attention to design and developer experience. He has driven app launches and architecture from the ground up—having been the first Android engineer at Giftmall and leading payment and remittance work at Mercari/Merpay—while establishing sustainable processes and migration paths (eg. preparing for Compose). An active open-source contributor to high-profile conference apps like DroidKaigi and Mixi’s AndroidTraining, he’s comfortable deep-diving into Android internals, tooling (LeakCanary, Stetho, Timber), and Kotlin adoption to improve maintainability. Based in Chiyoda, Japan, he pairs hands-on implementation skills with organizer experience from DroidKaigi, bringing both community-mindedness and practical delivery to mobile teams.
13 years of coding experience
13 years of employment as a software developer
Bachelor of Science in Media Science and Engineering, Media Arts, Science and Technology, Bachelor of Science in Media Science and Engineering, Media Arts, Science and Technology at University of Tsukuba
Stackoverflow
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Github Skills (26)
kotlin10
mobile-development10
rxjavafx10
android-fragments10
robolectric10
resource-management10
java10
javas10
android10
okhttp10
rxjava10
gradlew10
retrofit10
gradle10
dagger9
Programming languages (6)
Github contributions (5)
mixi-inc/AndroidTraining
Apr 2013 - May 2016
Training course repository for android app development
Role in this project:
Mobile Developer (Android)
Mobile Developer (Android)Contributions:188 commits, 2 PRs, 2 pushes in 3 years 2 months
Contributions summary:Keishin contributed to the development of an Android training course repository. The commits involved adding and fixing sample projects that demonstrated the use of Drawable resources, string resources, style resources, color state list drawables, dimension resources, animation resources, and menu resources. They also prepared sample projects for controller lifecycle implementation, showing a focus on Android UI and resource management.
androidtrainingandroid-appkotlinandroid-app-development
DroidKaigi/conference-app-2017
Jan 2017 - Mar 2017
The Official Conference App for DroidKaigi 2017 Tokyo
Role in this project:Mobile Developer (Android)
Mobile Developer (Android)Contributions:53 commits, 19 PRs, 12 pushes in 1 month
Contributions summary:Keishin primarily contributed to the DroidKaigi 2017 conference app by updating dependencies and refactoring code. They upgraded Robolectric, integrated Kotlin for testing purposes, and updated the Gradle version. Furthermore, they integrated crash reporting via Timber and Firebase, initialized LeakCanary for memory leak detection, and added support for Stetho debugging tools. Additionally, the user implemented and linked various navigation and information features within the app.
androiddroidkaigikotliniostokyo
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