Mobile Development

Run flutter doctor to green, boot an emulator or simulator, and know what to do when the Android toolchain refuses.

Declare variables and functions with real types, and explain why String? is a different type from String.

Use lists, maps, loops, and switch expressions with pattern matching instead of a stack of if statements.

Write immutable models, parse JSON into them, and model loading, data, and error as types you cannot forget to handle.

Await work that takes time, catch what it throws, and decide what the user sees during every one of those moments.

Compose MaterialApp, Scaffold, and AppBar, and rebuild a tree instead of mutating a view.

Lay out Row, Column, Expanded, and Padding, and diagnose the yellow overflow stripes yourself.

Hold state in a StatefulWidget and push it down to the smallest widget that actually needs it.

Build a scrolling ListView.builder, validate a Form with controllers, and design the empty state you forgot.

Declare routes, pass arguments, handle deep links, and see why imperative Navigator calls stop scaling.

Share state across screens using the mechanism Flutter ships with, before reaching for any package.

Split a feature into UI, ViewModel, and data layers following Flutter's own MVVM guidance.

Wire providers for async state and dependency injection, and override them in a test with no device attached.

Fetch JSON over http, decode it into typed models, and handle timeouts, empty results, and a server that returns 500.

Store settings with SharedPreferencesAsync, store records in Drift, and write a schema migration on purpose.

Unit test the ViewModel, widget test a screen, and use DevTools to find the rebuild you did not intend.

Request camera or location permission, handle the denied and permanently-denied paths, and open system settings when you must.

Set compileSdk and targetSdk in the Gradle Kotlin DSL, meet the 16 KB page size rule, and produce a signed release bundle.

Build against the iOS 26 SDK in Xcode 26, resolve dependencies with Swift Package Manager, sign, and upload to TestFlight.

Prepare icons, screenshots, and the data safety and privacy forms, and plan Play's 12 testers across 14 continuous days.