React Native navigation: stack, tabs, and auth flow

Why navigation becomes an architecture problem

At the start, it feels like a simple back button and a few screens. Once you add onboarding, tabs, profile, details, modals, and an auth flow, navigation stops being a UI detail and becomes part of product architecture.

A base structure that works

For most apps, three layers are enough:

• a root navigator for auth and the app shell;
• a stack for sequential user flows;
• tabs for the main product sections.

This keeps sign-in logic separate, preserves clean transitions, and avoids route duplication.

Where teams usually go wrong

The common mistakes are predictable:

• tabs are introduced too early and end up holding the whole app;
• auth state is mixed with screen-level navigation;
• deep links are ignored until they become painful;
• screen names and params grow without a shared contract.

A practical way to design it

Describe the user flows first, group screens by those flows, and only then build the navigator tree. If the route map cannot be explained on one diagram, the code will also be fragile.

Good navigation feels less like framework code and more like a calm user path through the product.