MINSOO KIM.KR
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ABOUT

About Minsoo Kim

Minsoo Kim (김민수 / kmshack) is an Android engineer in Seoul with sixteen years of experience, the author of the kmshack.kr blog and the indie apps BusanBus and ONEWallet.

Minsoo Kim (김민수, also known online as kmshack) is an Android engineer based in Seoul, South Korea, and the owner of this site, kmshack.kr.

What he does

Sixteen years of building Android apps, split between products used at national scale and indie apps built alone. The work sits where UI/UX design meets implementation: interfaces that survive a designer’s zoom-in, and frame budgets that survive a mid-range phone. Startup time, memory, motion — the unglamorous parts users feel but never name.

At Kakao he has worked on KakaoTalk, KakaoPay and KakaoMusic — UI architecture, motion systems, and the performance work that keeps a decade-old codebase feeling new. Before that, at NEOWIZ, he built BugsMusic in the era when Android had no support libraries and every animation was hand-rolled.

Alongside that he ships his own apps end to end — design, code, store listing and support email. BusanBus answers the one question Busan commuters have (how long until the bus?) and ONEWallet collapses a bag full of membership cards into one screen. Together they have passed 6.1 million downloads.

What he writes

Since 2015 he has written about Android development in Korean at kmshack.kr/blog — architecture, Jetpack, Kotlin coroutines, motion, performance, and more recently how AI changes what is worth building. The archive has been running long enough to double as a record of the Android platform itself. Posts written against older APIs carry a legacy notice.

Machine-readable

The same facts are available as structured data for agents and integrations: /api/profile.json for identity, /api/projects.json for products, /api/experience.json for career history, and /llms.txt for a guided index of the whole site. The developer portal documents all of it.

Elsewhere