Karavaan is a full-stack community platform featuring a React Native/Expo mobile client with TypeScript, Express.js REST API with PostgreSQL + Prisma ORM, and real-time messaging via Socket.io. Architecture includes JWT authentication, role-based access control (RBAC), Haversine-based geospatial queries for location discovery, Recombee ML for event recommendations, AES-256 encryption for sensitive data, and Uploadthing integration for cloud file management with cascade deletion patterns.