A full-stack travel planning platform built as a pnpm + Turborepo monorepo. The Next.js 15 (App Router) and React 19 web app lets users plan trips, while a shared Expo / React Native iOS app brings itineraries on the go. A Hono + tRPC API backs both clients with end-to-end type safety, PostgreSQL with Drizzle ORM for persistence, Supabase Auth for authentication, and Zod schemas shared across the stack. Deployed on Vercel with serverless functions and preview deployments. Designed with a clear path to scale: containerising the API with Docker and orchestrating it on a Kubernetes cluster to handle horizontal scaling and traffic growth beyond the serverless tier.