Mobile

Kotlin Android App Development

Native Android built in Kotlin, with Jetpack Compose for the interface and coroutines for everything that has to wait on the network.

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How we work

Kotlin has been Google's preferred language for Android since 2019, and Jetpack Compose has replaced the older XML layout system as the default way we build Android interfaces: a screen is described as a function of its current state, and Compose redraws only the parts that changed rather than requiring manual view updates. Coroutines and Flow handle asynchronous work, a network call, a database read, a stream of location updates, without the callback nesting that made older Android code hard to follow.

We build natively in Kotlin when an app needs something Android-specific on release day: a widget, a notification channel with custom behavior, deep integration with a device sensor, or a Play Store listing that has to clear policy review for a sensitive permission category. For products that need both Android and iOS without a strong platform-specific requirement pulling toward native, we more often recommend Flutter or React Native, and say so before scoping a native build that would cost more for a benefit the product does not need.

Fit

When Kotlin (Android) is the right choice, and when it is not

Good fit

The app needs a specific Android capability at launch: a home screen widget, a custom notification channel, background work tied to Android's battery and process lifecycle rules, or a sensor integration that a cross-platform bridge would lag behind on
Play Store policy review is a real risk for this app, sensitive permissions (background location, SMS, accessibility services), and getting the manifest and runtime permission flow right the first time matters more than sharing a codebase
The app is computation- or graphics-intensive on Android specifically, and native performance headroom outweighs the cost of a second codebase
You already have a Swift iOS app and want Android business logic to match it exactly without hand-porting each change; Kotlin Multiplatform can share that logic layer while each platform keeps its own native UI

Consider something else

The product needs one app covering iOS and Android on a limited budget without an Android-specific requirement driving the decision; Flutter or React Native reach both platforms from a single codebase for meaningfully less than two native builds
The team wants tight, ongoing feature parity between platforms and does not want a Kotlin codebase and a Swift codebase drifting apart as each gets touched independently over time
The app is an early-stage MVP where a testable version on both platforms matters more than platform-native polish at this stage
The interface is mostly forms and lists with no platform-specific interaction, the case where Compose's advantage over a cross-platform renderer is smallest

What we build

What we build with Kotlin (Android)

Jetpack Compose interface development
Declarative UI written in Compose, using Material 3 components and Android's own animation APIs for interfaces that match current platform conventions without hand-rolled view hierarchies.
Coroutines and Flow for asynchronous code
Structured concurrency for network calls, database access and background work, and Flow for streams that change over time such as a live location feed or a reactive database query, replacing older callback- and RxJava-based patterns.
Kotlin Multiplatform for shared business logic
Networking, data models and validation logic shared between an Android and an iOS codebase as a library, while each platform keeps its own native UI layer built in Compose and SwiftUI respectively.
Play Store release management
Manifest configuration, runtime permission flows and staged rollouts built to clear Play Store policy review on the first submission, including the sensitive permission categories that draw the closest scrutiny.
Background work and Android's process lifecycle
WorkManager for deferred and guaranteed background tasks, built around Android's battery optimization and process-death rules rather than around assumptions that a background task will simply keep running.

Ecosystem

Libraries and tools we pair it with

Jetpack Compose for declarative interface development
Kotlin Coroutines and Flow for asynchronous and reactive code
Room for local, on-device persistence
Hilt for dependency injection
WorkManager for background task scheduling
Kotlin Multiplatform for shared business logic across Android and iOS
JUnit and Compose UI testing for automated tests

Jetpack Compose versus the older Android View system

Android's original UI toolkit, built around XML layouts and imperative View updates, is still present in many existing codebases and still fully supported, but Compose has become the framework we default to for new screens. Describing a screen as a function of its state removes an entire category of bug where the displayed UI and the underlying data quietly disagree, since Compose recomputes the affected UI from state automatically instead of relying on a developer to update every view by hand.

For an existing View-based app, we do not recommend a wholesale rewrite. Compose interoperates with the View system directly, so new screens go in Compose while existing screens keep working, and a team migrates opportunistically as screens come up for other changes anyway.

Kotlin Multiplatform as a shared-logic option, not a shared-UI one

Kotlin Multiplatform lets a team write networking, data models, validation and other business logic once and compile it into both an Android and an iOS build, while each platform still renders its own native interface in Compose and SwiftUI. That is a different tradeoff from Flutter or React Native, which share the UI layer too: Kotlin Multiplatform costs more upfront to set up than a single cross-platform UI framework, but it keeps each platform's interface fully native rather than approximated.

We recommend Kotlin Multiplatform for teams that already have or plan native apps on both platforms and want their business logic, especially anything with real complexity like pricing rules or offline sync, to stay in one place instead of being reimplemented and kept in sync by hand in Swift and Kotlin separately.

Shares business logic (networking, models, validation), not the UI layer itself
Each platform keeps a fully native interface in Compose or SwiftUI
Fits teams already committed to native apps on both platforms, not a first cross-platform build

When Flutter or React Native is the cheaper call

Native Kotlin earns its cost when the product needs something Android-specific: a widget, a background service tied to the platform's lifecycle rules, or performance headroom for a demanding workload. When the actual requirement is reaching Android and iOS users with a consistent feature set on a reasonable budget, and no platform-specific capability is driving the decision, Flutter or React Native usually gets there for less, since one codebase replaces two.

We walk through this comparison with every mobile client before recommending a platform approach. Defaulting to native because it is the more technically thorough option, when the product does not need what native buys, doubles engineering cost for a benefit most of that app's users will not notice.

Services

Services that use Kotlin (Android)

Industries

Where we use it

FAQ

Kotlin (Android) FAQs

Do we need a native Android app in Kotlin, or would Flutter or React Native work?

It depends on whether the app needs something Android-specific: a widget, background work tied to the platform's process lifecycle, a sensitive permission flow that has to clear Play Store review cleanly, or performance headroom for a demanding workload. Without one of those, Flutter or React Native usually reach both Android and iOS for less than a separate native build on each platform.

Is Jetpack Compose stable enough to build a full app on now?

Yes, for the large majority of Android interfaces. Compose has been Google's recommended toolkit for new development for several years and covers standard navigation, lists, forms and animation thoroughly. It interoperates directly with the older View system, so a small number of specialized screens can stay on Views without blocking the rest of the app from using Compose.

What is Kotlin Multiplatform and is it the same as Flutter?

No. Kotlin Multiplatform shares business logic, networking, data models, validation, between an Android and an iOS build, while each platform still renders its own native interface in Compose and SwiftUI. Flutter shares the UI layer itself across both platforms. Multiplatform fits teams that want native interfaces on both platforms without duplicating the underlying logic by hand.

What Play Store review issues come up most with a new Android app?

Sensitive permission categories, background location, SMS and call log access, and accessibility services, draw the closest scrutiny and the most rejections on a first submission. We design the permission request flow and the manifest declarations around what Play Store policy actually requires for the specific permissions an app uses, rather than requesting broad access and fixing rejections after the fact.

Do coroutines replace the need for RxJava on a modern Android app?

For most projects, yes. Coroutines with Flow cover structured background work and reactive data streams that used to require RxJava, with less boilerplate and tighter integration with Kotlin's language features. An existing app already built on RxJava does not need an immediate rewrite; the two can coexist while new code moves to coroutines.

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