One TypeScript codebase, two clients. npm workspaces with Turborepo hold the React 18 web app (apps/web), the React Native 0.85 + Expo mobile app (apps/mobile), and eight shared packages consumed as raw source, so a single edit hot-reloads both apps.
The state (17 Redux slices and the gamification logic), the API layer behind a narrow HttpClient interface, the theme tokens, the translations, the validation schemas, and the icon registry are all one implementation. Each platform keeps only what must differ: persistence, navigation, token storage, and the entire render layer. The marketing site lives at the repo root, deliberately outside the workspace, and ships to Cloudflare Pages on its own.
One CI graph typechecks, builds, and tests every workspace, then runs the Playwright e2e suite against the full stack. A push to main publishes the web image to GHCR (Watchtower deploys it) and, when the mobile app or any shared package changed, builds a signed Android APK published to a rolling GitHub release.
The monorepo, UI components, Redux and data, language and theme, and UI security architecture topics all document this repository.