Kotlin · JVM + Android · From $20
Do My Kotlin Homework
The Kotlin compiler already killed your NullPointerException. So the grade rides on whether you respected the type system instead of papering over it with !! and lateinit, and on whether the Android app follows the MVVM and coroutine architecture the rubric demands. A working Kotlin developer writes the code null-safe and MVVM-clean, then pre-runs it against your autograder.
Null-safe, no gratuitous !! · MVVM-clean · Pay 50% after it runs
What we cover in Kotlin
Two course worlds, one toolchain
Kotlin lives in two places at once: intro CS1 problem sets on the JVM, and upper-division Android app development. The toolchain spans both. We write against the kotlinc K2 compiler you declare, the Gradle Kotlin DSL build in build.gradle.kts, the kotlinx.coroutines async model graders inspect, and the JUnit 5, Kotest, and MockK stack the autograders parse.
Null safety is where Kotlin marks are won and lost: nullable T?, the safe call ?., the Elvis operator ?:, and smart casts instead of a wall of !!. On the Android side the architecture is the grade. A ViewModel that holds no Context, coroutines scoped to viewModelScope rather than GlobalScope, a Room DAO and Entity layer, Retrofit for the network, and Hilt for dependency injection, all under MVVM. data class replaces boilerplate, sealed classes make a when exhaustive, and the whole thing ships ktlint and detekt clean.
Kotlin assignments we do
Four assignment shapes, start to graded
A CS1 problem set in idiomatic Kotlin
The daily UIUC CS124 shape: implement a function, a generic class, or a small data structure such as a stack, a linked list, or a heap, using data class, sealed classes, and the collection operators map, filter, and fold. It has to pass a generated test suite, not just your console, so the solution clears the Jenisol test-generator and the Questioner autograder rather than reading right on paper.
An Android app with MVVM, Room, and Retrofit
A multi-screen app that loads from a REST API through Retrofit, caches to a Room database with a DAO and an Entity, exposes state from a ViewModel as StateFlow or LiveData, and renders a RecyclerView or a Jetpack Compose list. This is the Oklahoma State CS 4153 / CS 5153 semester brief, graded on architecture separation, coroutine scoping, and offline behavior, not on whether the screen draws.
A coroutine and concurrency assignment
Fetch-in-parallel, cancellation, timeout, or producer-consumer work built with async and await, withContext, Flow, and supervisorScope. The marks ride on structured-concurrency correctness and on cancellation actually propagating instead of dying quietly. We test it with runTest and virtual time so the timing is deterministic, not flaky on the grader.
A Jetpack Compose UI and state assignment
A @Composable screen with remember and mutableStateOf state hoisting, event callbacks lifted to the caller, and Modifier.testTag identifiers so the Compose UI tests can find their targets. Graded on recomposition correctness and state-hoisting discipline, the two places a Compose submission usually leaks marks even when it looks fine on the emulator.
Kotlin problems we fix
Six Kotlin failures that cost real marks
Every one of these compiles. That is the trap. The compiler lets the code through, and then the runtime, the rubric, or the linter takes the marks. We name the mechanism behind each one and fix the cause, not the symptom.
!! abuse that throws a NullPointerException
Slapping the not-null assertion !! on a nullable to silence the compiler, which then throws at runtime exactly where null safety was meant to protect you. We trace each !! and rewrite it with a safe call ?., an Elvis fallback ?:, or a smart-cast if (x != null) block, so the type system does the work and !! is reserved for values that are provably non-null.
lateinit read before init crashes the screen
Reading a lateinit var before it is assigned, the classic in an Android onCreate or a misordered test, which throws UninitializedPropertyAccessException. We initialize before access, guard with ::prop.isInitialized, or switch to by lazy {} or a nullable with a sensible default.
GlobalScope.launch leaks a coroutine
A fire-and-forget GlobalScope coroutine outlives the screen that launched it, so a 30-second network call keeps running after the user navigates away and the Activity is held in memory. We move the launch into a lifecycle-bound scope, viewModelScope or lifecycleScope, or a CoroutineScope you cancel, so the work dies with the screen.
A swallowed CancellationException breaks cancellation
Catching Exception or Throwable inside a coroutine without rethrowing CancellationException, so cancellation silently dies and the structured-concurrency rubric point goes with it. We rethrow CancellationException, catch specific types only, and keep suspend functions cooperatively cancellable with ensureActive() or yield().
A Context held in a ViewModel leaks the Activity
Storing an Activity Context, a View, or a LiveData observer in the ViewModel breaks MVVM and leaks the Activity on a rotation, which is an automatic rubric fail in an Android course. We keep the ViewModel framework-free, pass an Application through AndroidViewModel only when it is genuinely needed, and expose StateFlow or LiveData outward.
Platform-type and runBlocking landmines from Java interop
Trusting an un-annotated Java return as non-null, a platform type that shows as String!, or calling runBlocking on the Android main thread and freezing the UI. We treat platform types as nullable and null-check at the boundary, keep runBlocking in tests and main only, and use viewModelScope.launch with withContext(Dispatchers.IO) in app code.
One more tell graders watch for: ktlint and detekt style failures. A Java-style for loop where a map would read, a mutable var where a val fits, a missing trailing comma. None of it breaks a test. All of it quietly drops the style score. We ship idiomatic so that column stays at zero.
Larger graded projects
Do My Kotlin Assignment
An assignment here means the semester-long Android app or the concurrency project, not the daily problem set. A multi-screen MVVM app with Room persistence and a Retrofit backend, or a coroutine task that fetches in parallel and cancels cleanly, lands as one working build. The repo grows in staggered, human-looking commits across the project window, the way a grader expects a milestone Android project to come together, not as a single end-of-night push to GitHub.
The architecture follows the convention Android courses enforce. State flows out of the ViewModel as StateFlow or LiveData, the ViewModel holds no Android framework types, and the coroutines are scoped to viewModelScope. The build runs clean on ./gradlew test and ./gradlew assembleDebug, and the languageVersion and targetSdk in build.gradle.kts match the brief.
Walkthrough on the spec
Kotlin Assignment Help (Android and Project Specs)
Some students want the Android project built and explained, not just handed over. Every delivery comes with a short write-up of the architecture: why the ViewModel is shaped the way it is, where StateFlow replaces LiveData, how the Room schema maps to the Retrofit response, and where the coroutine boundaries sit. Two or three viva-defense questions ship with it, the kind a TA asks when they want you to account for your own MVVM split.
Get Help With a Kotlin Assignment
Stuck on one piece of a bigger project rather than the whole thing? Send the part that is failing: a GlobalScope leak you cannot pin down, a single ViewModel test that stays red under MockK, a lateinit crash in onCreate. We fix that slice, explain the cause, and leave the rest of your code as yours.
Daily problem sets
Kotlin Homework Help (Daily Problem Sets)
Homework is the recurring small stuff: a UIUC CS124 daily exercise drawn from the 700-plus authored problems, a generic class, a List or Map transformation, a basic data structure. These need an idiomatic-Kotlin solution that passes the Jenisol generated suite and the Questioner autograder, and they need it fast, not a milestone repo. Send the brief, get a fixed quote, get back code that clears the suite and reads like Kotlin, not transcribed Java.
Get Help With Kotlin Homework
Prefer to learn it rather than hand it off? We pair on the fix instead of just dropping the answer. We walk through why the safe call ?. beats the !!, when the Elvis operator ?: earns its keep, and why a smart cast reads cleaner than a forced unwrap, so you can write the next null handler yourself.
// before: app crashed on rotation, ViewModel test red, !! on every nullable
// cause: Context held in the ViewModel, GlobalScope.launch leaking the call,
// a forced user!!.name throwing UninitializedPropertyAccessException
//
// after: Context out of the ViewModel, viewModelScope.launch, user?.name ?: "",
// MockK coEvery + runTest green, ktlint clean, no leak on rotation
//
// "I could defend the MVVM split and the coroutine scoping in the demo."
// - mobile app dev student, Kotlin 2.1, targetSdk 34, 2026How it works
From brief to green suite
Send the brief and your Kotlin version
Upload the spec, the rubric, your Kotlin languageVersion (2.0, 2.1, or 2.2), and the Android targetSdk if it is a mobile app. Name the autograder if you know it: a CS124 Jenisol format or a plain ./gradlew test.
Get a fixed quote in 15 minutes
A Kotlin developer reads the spec and sends one price. No hourly meter, no surprise fees.
Pay half, code written and tested
You pay 50% upfront. The code is written null-safe and MVVM-clean, the JUnit, Kotest, and MockK suite is run, and ktlint and detekt are cleared before anything reaches you.
Pay the rest after it runs
Run ./gradlew test on your machine. Pay the other 50% only once the suite is green. Revisions stay free for 7 days.
Want the full process first? Read how it works.
Pricing
One fixed price per Kotlin assignment, from $20
A single daily CS124 exercise sits at the Standard tier. A coroutine concurrency task moves up. A semester-long Android MVVM app with Room and Retrofit lands at Advanced. You see the full number before you pay, you pay half to start, and there are no rush fees.
Kotlin homework help
Questions, answered
The Kotlin-specific questions students ask before they send a brief: language versions, autograders, null safety, MVVM, coroutines, and the build tools.
Will your code pass the autograder, CS124 Jenisol or a Gradle test run? +
Yes. The submission is pre-run against the generated test suite or ./gradlew test before delivery, idiomatic-Kotlin style included, so it clears the grader the same way it clears your console.
Can you match my Kotlin language version (2.0, 2.1, or 2.2) and my Android target SDK? +
Yes. The languageVersion and targetSdk are declared in build.gradle.kts and the code is compiled against them, so nothing breaks because the grader runs a different K2 line or SDK than your laptop.
My code uses !! everywhere and crashes with a NullPointerException. Can you fix it? +
Yes. We trace the !! calls and rewrite them with safe calls ?., the Elvis operator ?:, and smart casts so the type system does the null handling instead of a runtime throw papering over it.
Can you build the full Android MVVM app: ViewModel, Room, Retrofit, Compose? +
Yes. A clean MVVM split with viewModelScope coroutines, a Room DAO and Entity layer, Retrofit API calls, and a Jetpack Compose or RecyclerView UI, with no Context held in the ViewModel.
Can you write the JUnit, Kotest, and MockK tests too, including for suspend functions? +
Yes. ViewModel and repository tests with MockK using coEvery and coVerify for suspend functions, and runTest virtual-time control so the coroutine tests run deterministically.
My coroutine leaks and cancellation does not work. Can you fix the concurrency? +
Yes. Unscoped GlobalScope launches are moved into viewModelScope or lifecycleScope, and CancellationException is rethrown so structured concurrency cancels cleanly instead of dying in a catch block.
Is it Gradle Kotlin DSL or Maven, and does that matter? +
Either works. The build ships with a working build.gradle.kts, or a pom.xml if your project is on Maven, matching your project layout and dependency block so the build runs straight away.
Will the code pass ktlint and detekt style checks? +
Yes. The code ships idiomatic and lint-clean: val over var where the value never changes, no Java-style boilerplate loops, and the formatting rules your course enforces satisfied.
Related pages
Pages students pair with Kotlin
Java for the JVM sibling that CS124 teaches alongside Kotlin and the interop assignments that cross between them, Swift for the iOS counterpart in a mobile-development track, SQL for the database half of a Room persistence task, and the data-structures hub where CS124 teaches CS1 in Kotlin.
Send your Kotlin brief now
Name your Kotlin version, your targetSdk, and your deadline. The first reply is free, and you pay nothing until you approve the price.