Sony-DroidKaigi2026 - Speaker Deck

Sony-DroidKaigi2026

by ソニー株式会社

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53.1 %

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2x bet on early frameworks

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93.9 %

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2021 2022 2023 2024 2025

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2021 2022 2023 2024 2025

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KMP REACT NATIVE For Biz logic For UI

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Android Studio Obj-C Xcode VSCode

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The ReactNative TAX

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g Kotlin Typescript Objective-C 53.1% 17.2% 50% Swift 14.7% Others 13.0% 2% 100%

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but…

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new tech = risk?

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how?

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ACT II Small bets BIG Moves

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01 Experiment first 02 Bet asymmetrically まず実験する⾮対称に賭ける 03 Build a boundary 境界を作る

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Hardware

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Platform Background execution

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2 week checkpoints

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working software

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Fallback The bet

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we chose alpha

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InvalidMutabilityException

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Main-Thread

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No issues in production

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Lesson 1 Don’t ask to adopt ask to experiment 導入の前に、まずは実験

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01 Experiment first 02 Bet asymmetrically まず実験する⾮対称に賭ける 03 Build a boundary 境界を作る

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01 Experiment first 02 Bet asymmetrically まず実験する⾮対称に賭ける 03 Build a boundary 境界を作る

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2023 + J2ObjC + Native KMP + RN

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source: http://blog.jetbrains.com/kotlin/2023/05/compose-multiplatform-for-ios-is-in-alpha/

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2023 Aug Dec 2024 Jan Feb Mar Apr May Jun ... Oct

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2023 Aug Dec 2024 Jan Feb Mar Apr May Jun ... Oct

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2023 2024 ✅ Aug Dec Jan Feb Mar Apr May Jun ... Oct

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Fallback The bet SwiftUI + Jetpack Compose CMP

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Android

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iOS

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we chose beta

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Lesson 2 Make the standard your fallback フォールバックとして標準を準備しておく

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are we done?

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? 2021 2022 2023 2024 2025

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? 2021 2022 2023 2024 2025

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01 Experiment first 02 Bet asymmetrically まず実験する⾮対称に賭ける 03 Build a boundary 境界を作る

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01 Experiment first 02 Bet asymmetrically まず実験する⾮対称に賭ける 03 Build a boundary 境界を作る

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J2ObjC + Native KMP + RN + 7 years 2 years HW driven Agile Jenkins CircleCI

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Domain Driven Design

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Fallback The bet

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All comms through boundary 全ての通信は境界を介して行う Keep boundary simple 境界はシンプルに保つ Code: ≤1%. One owner コードは1%以下に

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0.2%

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J2ObjC + Native KMP + RN CMP + Native + J2ObjC + HW driven 8 weeks 8 weeks Jenkins CircleCI Github Actions

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Lesson 3 Build a boundary don’t rewrite 境界で分けることで書き換えを避ける

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Don’t ask to adopt. Ask to experiment 導入の前に、まずは実験 Industry standard = your fallback フォールバックとして標準を準備しておく Build a boundary, don’t rewrite 境界で分けることで書き換えを避ける

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ACT III Results

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Before Kotlin Typescript Objective-C 53.1% 17.2% 50% Swift 14.7% Others 13.0% 2% 100%

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Before Kotlin Typescript Objective-C 53.1% 17.2% Swift 14.7% 50% After Kotlin Swift 93.9% Others 13.0% 2% 100% Others 6.0% 0.1%

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MILLIONS INSTALLS, GLOBALLY, BOTH PLATFORMS

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C M P + N AT I V E + J2OBJC 8 WEEKS RELEASES

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source: https://ifdesign.com/en/winner-ranking/project/sony-sound-connect/758473

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we made a boundary 境界で分けたから we kept a way back 戻れるようにしたから we started small 小さく始めたから