Kotlin — Course #305 · Google's Official Android Language

Write Concise, Safe

Code with Kotlin ✨

Kotlin is Google's preferred language for Android development — concise, expressive, and fully interoperable with Java. Used by Google, Pinterest, Airbnb, and Netflix, Kotlin brings null safety, coroutines, extension functions, and multiplatform capabilities to modern app development.

Null SafetyCoroutinesExtension FunctionsData ClassesSealed ClassesGenericsKotlin FlowKotlin DSLKMPAndroid

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Kotlin — Coroutines & Data Classes

data class User(
  val id: Int,
  val name: String,
  val email: String
)
class UserRepository(
  private val api: UserApi
) {
  suspend fun getUser(id: Int): User {
    return withContext(Dispatchers.IO) {
      api.fetchUser(id)
    }
  }
  fun usersFlow(): Flow<List<User>> =
    flow { emit(api.getAllUsers()) }
      .flowOn(Dispatchers.IO)
}

42K+

Jobs

Kotlin roles

40 hrs

Duration

Video content

Modules

Full syllabus

Cert

Included

Industry recognised

24/7

Support

Expert guidance

What You Master

The Complete Kotlin Skill Set

From Kotlin fundamentals and coroutines to Android development, Kotlin Multiplatform, and server-side Ktor.

✨

Coroutines & Kotlin Flow

Master Kotlin's structured concurrency — coroutines replace callbacks and RxJava with simple, readable async code. Use suspend functions, CoroutineScope, Dispatchers, and launch/async builders. Kotlin Flow provides cold reactive streams with powerful operators like map, filter, combine, and collectAsState for seamless Android integration.

CoroutinessuspendFlowStateFlowSharedFlowDispatcherslaunch/asyncwithContext

🛡️

Null Safety & Type System

Kotlin's type system eliminates NullPointerExceptions. Nullable types (?), smart casts, Elvis operator, and sealed classes for exhaustive handling.

🏗️

OOP & Functional

Data classes, sealed classes, extension functions, higher-order functions, lambdas, and Kotlin DSL for clean, expressive code.

🌐

Kotlin Multiplatform (KMP)

Share business logic across Android, iOS, Web, and Desktop. Write once in Kotlin, compile to JVM, Native, and JavaScript.

KMPKtorShared Logic

Syllabus

Course Curriculum

10 comprehensive modules from Kotlin basics to coroutines, KMP, and production Android development.

What is Kotlin? History and the JVM ecosystem
Kotlin vs Java — Key Differences and Advantages
Installing Kotlin — IntelliJ IDEA & Android Studio
Running Kotlin Programs — REPL and Script Mode
First Kotlin Program and Project Structure

Variables — val, var, const, Type Inference
Data Types — Int, Long, Double, String, Boolean, Char
String Templates & Multiline Strings
Operators — Arithmetic, Comparison, Logical, Range
Null Safety — Nullable Types, ?. and ?? Operators

if-else as Expression, when as switch replacement
Loops — for, while, do-while, forEach, repeat
Functions — Named, Default, and Vararg Parameters
Higher-Order Functions & Lambdas
Extension Functions & Extension Properties
Inline Functions for Performance

Classes & Objects — Primary & Secondary Constructors
Data Classes — equals, hashCode, copy, toString
Sealed Classes & Sealed Interfaces
Enums & Objects — Companion Objects, Singletons
Inheritance, Abstract Classes & Interfaces
Visibility Modifiers & Nested Classes

Immutable vs Mutable Collections — List, Set, Map
Collection Operations — map, filter, reduce, fold, groupBy
Sequences for Lazy Evaluation
Destructuring Declarations
Scope Functions — let, run, with, apply, also
Standard Library Functions

Why Coroutines? Callbacks vs RxJava vs Coroutines
CoroutineScope, CoroutineContext & Dispatchers
suspend Functions & async/await Builders
launch, async, runBlocking
Error Handling in Coroutines — try/catch, SupervisorJob
Structured Concurrency & Cancellation

Cold Streams — Flow vs Hot Streams
Flow Builders — flow {}, flowOf, asFlow
Flow Operators — map, filter, transform, combine
StateFlow & SharedFlow for State Management
collectAsState() in Jetpack Compose
Testing Coroutines & Flow with Turbine

Generics — Type Parameters, Variance (in/out)
Type Aliases and Inline Classes (Value Classes)
Delegation — by keyword, Observable Properties
Kotlin DSL Building — Type-Safe Builders
Kotlin Reflection Basics
Annotations & Annotation Processors (kapt, ksp)

Kotlin in Android — Why Google Chose Kotlin
Android KTX Extensions
Jetpack Libraries with Kotlin — ViewModel, LiveData, Room
Hilt Dependency Injection in Kotlin
MVVM Architecture with Kotlin Coroutines & Flow
Building Android Apps with Kotlin & Jetpack Compose

Kotlin Multiplatform (KMP) — Share Code Across Platforms
Ktor for Building HTTP Servers and Clients
Exposed for Type-Safe SQL in Kotlin
Kotlin Script (kts) for Build Files & Automation
Testing in Kotlin — JUnit 5, MockK, Turbine
Publishing Libraries to Maven Central & Gradle Plugin Portal

Career Outcomes

Kotlin Careers in 2026

Kotlin is Google's officially recommended language for Android development. With 42K+ active job listings and growing adoption for backend (Ktor) and multiplatform (KMP), Kotlin developers are among the most in-demand mobile engineers globally.

₹10–38L

India Avg LPA

$110K–$190K

USA Avg

42K+

Active Jobs

38% Growth

Year-on-Year

Android/Kotlin Developer

Build Android apps with Kotlin, Coroutines, Flow, and Jetpack — Google's official recommended stack

₹10–30 LPA · $110K–$175K USA

Kotlin Backend Developer

Build high-performance servers and microservices with Ktor, Exposed, and Kotlin Coroutines on the JVM

₹14–40 LPA · $120K–$190K USA

KMP Developer

Share business logic across Android, iOS, and Web using Kotlin Multiplatform — a rapidly growing niche

₹16–45 LPA · $125K–$200K USA

Kotlin Tech Lead

Lead Kotlin teams, define architecture, mentor developers, and drive adoption of modern Kotlin practices

₹22–60 LPA · $140K–$215K USA

Ready to Master Kotlin?

Kotlin is the official language of Android development endorsed by Google. Concise, safe, and interoperable with Java — Kotlin opens doors to Android development, backend services, and cross-platform mobile with KMP.