Most Flutter ecommerce tutorials end at the same place: a product grid, a cart, a checkout button wired to a payment SDK. That's a store. If you're building a marketplace, where independent sellers list products and buyers purchase from many of them, the tutorial stops right where the hard engineering begins.

This post is a working checklist for developers scoping a Flutter ecommerce marketplace. It's based on the Flutter eCommerce app guide for marketplace founders published by Journeyhorizon, reorganised around the questions an engineering team actually has to answer before writing the first widget.

Why Flutter is a reasonable default here

Let's get the framework question out of the way, because it's rarely the thing that sinks a marketplace.

One codebase, two stores. A single Flutter project compiles to iOS and Android. For a team with limited resources, not maintaining two parallel native codebases is a big deal, and it shortens time to market.

No JavaScript bridge.…