Backend

• Language: Kotlin (JVM 21)
• Framework: Spring Boot 3.x
• Build tool: Gradle (Kotlin DSL)
• Database: PostgreSQL
• ORM: Spring Data JPA
• Migrations: Liquibase
• Auth: Spring Security + JWT (jjwt 0.12.x)
• API docs: Springdoc OpenAPI
• Logging: Logbook
• Testing: JUnit 5 + H2 (in-memory; H2 1.4+ supports SQL window functions used by the activity feed dedup query — version managed via Spring Boot BOM)
• Caching: Caffeine (version managed via Spring Boot BOM; used for in-process caches such as the projectId → tenantId + projectName lookup in ActivityEventBus)

Frontend

• Language: TypeScript
• Framework: Vue 3 (Composition API)
• Build tool: Vite
• Styling: Tailwind CSS 4
• State management: Pinia
• Routing: Vue Router
• HTTP client: Axios
• i18n: vue-i18n
• UI components: HeadlessUI · Icons: Lucide Vue Next
• Fonts: Inter (Google Fonts), JetBrains Mono (Google Fonts)
• Design tokens: CSS custom properties (warm charcoal theme)
• E2E testing: Playwright

Infrastructure

• Database: PostgreSQL via Docker Compose
• Claude Code CLI: Installed locally, used by the PM orchestrator to run dev agents