skyl-dev

Jetpack Compose mechanics: what belongs in an effect rather than the composable body, how state is hoisted and remembered, and what makes…

Android architecture and platform decisions: where state lives, what survives process death, what work leaves the main thread, and what…

Persistence and offline behaviour: where a value lives, what survives, transactions, migrations, and what happens when the network does…

The object graph: what lives how long, what may depend on what, and when a wiring mistake is discovered.

Images that arrive at runtime, fetched or picked or decoded: caching, sizing, cancellation, and what a picker actually hands back.

Java on Android without the language features Kotlin has: threading, equality, resource handling, and interoperating with Kotlin.

The shape of the layer graph: which layers exist, which way dependencies point, and what each one may touch.

Talking to a server: client configuration, what comes back, what happens when it does not, and how a request is authorised.

Runtime permissions: whether to ask at all, how to ask, and what the app does with every answer including the silent ones.

Keeping a secret on a device you do not control: key storage, backup, intents, and client-side checks that are signals rather than controls.

What makes a test able to fail for the right reason: the shape of the seam, the scheduler it runs on, and what an assertion is allowed to…

The View system: layouts, adapters, RecyclerView, ViewBinding, and the seam where a ComposeView sits inside a View hierarchy.