Mobile Architecture at Scale: 10 Million Users

Modularization

Split the app into feature modules (Login, Feed, Profile). Decouple them. Faster build times, independent team ownership.

You cannot have 50 shades of grey. A strict UI component library (buttons, typography, colors) is mandatory for consistency.

Don't wait for App Store approval to change the layout. The server sends JSON describing the UI (components, order, content). The app renders it.

The train leaves every 2 weeks. If your feature isn't ready, it misses the train. Rigid schedules prevent release paralysis.

Crashlytics is not enough. You need distributed tracing (OpenTelemetry). How long did the "Checkout" flow take? Where did users drop off?

Conway's Law. Structure teams around features (Squads), not technologies. iOS and Android devs sit together with PM and Designer.

Google does it. Uber does it. Sharing code (models, logic, utils) between web and mobile, or between iOS and Android (KMP), becomes critical.