| name | kotlin-patterns |
| description | Kotlin architecture reference - frameworks, design patterns, coroutines, Compose Multiplatform, KMP, Ktor, Spring Boot, and production best practices for Kotlin 2.0/2.1 (2024-2025). Use when making architectural decisions, reviewing Kotlin code, or selecting libraries. |
| user-invocable | true |
| argument-hint | [frameworks|patterns|architecture|practices|features|all] |
Kotlin Architecture Reference (2024-2025)
Comprehensive reference for Kotlin architectural decisions. Use $ARGUMENTS to focus on a specific area, or browse all sections.
Quick Navigation
- For framework/library selection and comparisons, see frameworks.md
- For design patterns (sealed classes, DSL builders, delegation, coroutines), see design-patterns.md
- For architecture patterns (Clean, MVI/MVVM, multi-module), see architecture.md
- For best practices (null safety, coroutines, extensions, K2), see best-practices.md
- For language features (Kotlin 2.0/2.1, K2 compiler, KMP), see language-features.md
Decision Framework
- Backend: Enterprise/existing Java -> Spring Boot (Kotlin DSL). Kotlin-native server -> Ktor. Lightweight -> http4k
- Mobile: Android UI -> Jetpack Compose. Cross-platform UI -> Compose Multiplatform. Shared logic only -> KMP
- Database: Type-safe SQL DSL -> Exposed. ORM -> Hibernate (Spring). Async -> R2DBC + Jasync
- DI: Android/KMP -> Koin. Compile-time -> Dagger/Hilt. Spring -> built-in Spring DI
- Testing: Default -> kotlin.test + MockK. Coroutines -> Turbine. Property-based -> Kotest
- Serialization: Default -> kotlinx.serialization. JSON interop -> Moshi/Gson (legacy)
- Build: Always Gradle (Kotlin DSL). Version catalogs for dependency management
Kotlin in Production
| Company | Result |
|---|
| Google | Android's preferred language, 95%+ of top apps use Kotlin |
| JetBrains | IntelliJ platform, Space, Kotlin compiler itself |
| Netflix | Backend services, Android app |
| Uber | Android app (100% Kotlin), some backend services |
| Pinterest | Android (100% Kotlin), backend services |
| Slack | Android app, shared KMP modules with iOS |
| Cash App | Full stack: Android + server + KMP shared code |
Kotlin Evolution
| Version | Key Features |
|---|
| 1.9 (Jul 2023) | K2 beta, enum entries, data object, .. operator for ranges |
| 2.0 (May 2024) | K2 compiler stable (2x faster), Smart cast improvements, Compose compiler plugin merged |
| 2.1 (Nov 2024) | Guard conditions in when, multi-dollar strings, non-local break/continue |
| 2.2 (2025) | Context parameters (replacing context receivers), UUID in stdlib, Base64 |
Related Skills
