Coding Rounds

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Real Flutter live-coding tasks asked in interviews — fix bugs, predict output, review code, build UIs against the clock.

Done	Problem	Frequency	Note	Revision	Difficulty
	Code review: Cutting the release bundle in half				Hard
	Fix: Reproducing a hidden async exception				Medium
	Predict output: Trace: an `async*` generator with no `.listen()`				Easy
	Predict output: Trace: two functions that throw, one `async` and one not				Hard
	Fix: Settings screen — listener fires twice				Medium
	Fix: Logo looks fuzzy on flagship devices				Easy
	Predict output: Trace: a broadcast stream — adds before, after subscribing				Easy
	Code review: Chat app — state-management strategy				Hard
	Predict output: Trace: a Completer completed inside a `Future`, polled by a `while`				Hard
	Fix: Background config loader				Hard
	Fix: Search input that keeps clearing itself				Easy
	Fix: Submit button after async confirmation				Medium
	Predict output: Trace: overridden `==` and `hashCode`, plus an `identical` check				Medium
	Predict output: Trace: comparing two `Point` instances				Easy
	Predict output: Trace: print, Future, print, microtask				Easy
	Predict output: Trace: a mix of Futures, microtasks, and `.then()`				Medium
	Predict output: Trace: a Flutter tap handler with eight scheduling primitives				Hard
	Fix: Push notifications stop firing when the app is killed				Medium
	Code review: Bluetooth plugin going cross-platform				Hard
	Predict output: Trace: which `.add(4)` calls succeed, which throw?				Medium
	Predict output: Trace: `Future.wait` when one Future throws at 1s, another at 5s				Medium
	Predict output: Trace: how many times does this `FutureBuilder`'s builder run?				Medium
	Fix: Profile screen flashes a spinner				Medium
	Predict output: Trace: a `HashSet<User>` after two `.add()` calls				Hard
	Code review: Leaderboard rendering				Medium
	Code review: Photo gallery OOM crashes				Medium
	Fix: Long signup form				Easy
	Predict output: Trace: reading a `late` field that was never set				Easy
	Fix: Auth service — works locally, crashes in CI				Medium
	Predict output: Trace: `==` and `identical` on lists, mutable vs `const`				Medium
	Predict output: Trace: assigning a list, then mutating it				Easy
	Code review: Notifications feed PR				Easy
	Code review: Promo banner widget				Medium
	Predict output: Trace: a microtask that schedules another microtask				Hard
	Fix: Profile screen that loads data on open				Easy
	Predict output: Trace: `??` then `??=` on a nullable `int`				Easy
	Code review: Animated profile cards				Hard
	Code review: Stats dashboard with tap counter				Medium
	Predict output: Trace: a function that increments its `int` parameter				Easy
	Fix: Debug works, release crashes				Medium
	Fix: Profile card title row				Easy
	Code review: Performance PR for the activity feed				Medium
	Predict output: Trace: chained `??=` on a nullable `String`				Easy
	Fix: Add-to-list screen with memoized children				Easy
	Fix: File reader with two consumers				Easy
	Predict output: Trace: a `Timer` plus a synchronous `sleep()` in the same `main`				Medium
	Code review: VIP-highlighted user list				Medium
	Fix: Live data screen				Easy
	Fix: Firestore-backed items list				Medium
	Fix: Auto-refresh counter screen				Easy
	Fix: Auth refresh that logs users out				Hard
	Predict output: Trace: two `Completer`s each awaiting the other				Hard
	Build UI: One-on-one chat screen				Medium
	Build UI: Drawings home screen				Easy
	Build UI: First-time login flow				Medium
	Build UI: Movie watchlist app				Medium
	Build UI: Todo app — offline-first build				Hard
	Build UI: Phone number verification flow				Medium
	Build UI: Movie streaming app — visibility probe				Hard
	Build UI: Internal directory home				Easy
	Build UI: Cart screen				Medium
	Build UI: Discovery card swipe				Hard
	Build UI: Weight tracking app				Hard
	Fix: Header + scrollable items screen				Medium
	Code review: Edit-profile screen				Easy
	Predict output: Trace: a `yield*` wrapped in `try / catch` whose inner stream throws				Medium
	Predict output: Trace: two streams composed with `yield*`				Easy