GreenCart Market is a 5-surface bundle: two Flutter apps (customer + rider) plus one Next.js 16 project that is the public storefront, the /vendor portal, the /admin panel, and the only backend. It is a vertical marketplace for organic / local / farm-to-table grocers, built on a modern TypeScript stack (Next.js + PostgreSQL + Drizzle) — not the PHP/Laravel platforms that dominate this category. Two differentiators the incumbents lack: subscription produce boxes and product provenance / sourcing.