We start with your users’ devices
Analytics show which phones, screen sizes and Android versions your audience actually uses.
Top 12 devices cover 70% of sessionsAndroid App Development
Android apps for every device
Android app development in Kotlin and Jetpack Compose, tuned for budget phones, flagships, tablets and foldables alike.
<1s cold start target99.8% crash-free targetPhones to foldables
The difference
One-size layouts break. Adaptive apps fit.
Typical port to Android
Stretched UI*opens app on a tablet*
Buttons stretched across the screen. Text cut off.
My upload disappeared when the app closed.
App isn’t responding. Close app?
Frustration
Inside an Android build
Step by step, start to finish
Compose layouts that adapt
Kotlin, coroutines and Jetpack Compose with window size classes for phones, tablets and foldables.
One screen, three layoutsProven on real hardware
Unit, UI and device-lab tests across manufacturers, memory sizes and Android versions.
Firebase Test Lab: 48 profiles passedReleased in stages
Play Console staged rollout while Android vitals and crash reports are watched live.
10% → 50% → 100% rollout60 device profiles coveredIllustrative device coverage for a typical Android release
Benchmark
Opens fast on any phone
Gen7Ven Kotlin appbaseline profiles, lean bundle
<1s cold startTypical unoptimised native appno startup profiling
1.5–3sTypical hybrid wrapperloads a web runtime first
3–5sUse cases
Where native Android pays off
Field and logistics
Rugged devices, scanners and GPS in low signal.
Fintech at scale
Biometric login that runs well on budget phones.
Connected devices
Bluetooth and sensor sync with wearables and IoT.
Tablets and kiosks
Adaptive layouts for large and dedicated screens.
Built in
Built in to every Android app
Adaptive layouts
Jetpack Compose screens that fit phones, tablets and foldables.
Reliable background work
WorkManager keeps uploads and syncs running through restarts.
Hardware-backed security
Android Keystore encryption, certificate pinning and R8 obfuscation.
Material You
Dynamic colour, dark theme and edge-to-edge display support.
In depth
Android app development with Kotlin and Jetpack Compose
Our Android app development service builds native apps in Kotlin that perform well on the full range of Android hardware, from entry-level phones to tablets and foldables. We design for the devices your customers actually own, then release through Google Play with staged rollouts and live crash monitoring.
Kotlin app development for reliable, maintainable code
Kotlin is Google’s preferred language for Android, and its null safety and concise syntax remove whole categories of crashes. Our Kotlin app development uses coroutines for responsive background work, an MVVM architecture that separates business logic from the interface, and Jetpack libraries for navigation, storage and lifecycle handling. Jetpack Compose lets us build interfaces faster and adapt them to every window size. The result is a codebase with strong test coverage that new features can be added to without slowing the team down.
Designing for Android fragmentation
Thousands of device models run Android, with different screen densities, memory sizes, manufacturer customisations and operating system versions. We start by mapping the devices, versions and screen sizes your audience actually uses, then build adaptive layouts, keep app bundles lean with on-demand feature modules, and use baseline profiles to shorten cold start on slower phones. Testing runs on real hardware through device labs, not only emulators. Background tasks use WorkManager so uploads and syncs survive aggressive battery management on some manufacturers’ devices.
Android developers for hire, with Google Play release built in
When you hire Android developers through Gen7Ven, you get a team that owns the full release path. We set up the Play Console, signing keys, App Bundles, data safety declarations and testing tracks, then release in stages while monitoring Android vitals and Firebase Crashlytics. If a problem appears at 10% rollout, we halt it before it reaches everyone. We also build for specialised hardware, including handheld scanners, kiosks and Bluetooth peripherals, where direct native access to device APIs really matters.
Modernising existing Android apps
Older Android apps written in Java with XML layouts can still be brought up to date without a risky rewrite. Because Kotlin and Java work side by side, we migrate gradually: new features are written in Kotlin and Compose, while existing screens are converted in order of value. Each step is released and monitored like any other update. The app keeps working throughout, crash rates fall as legacy code is retired, and the codebase becomes easier for any Android team to maintain.
Plugs into
Works with Google’s platform and your stack
KotlinAndroidAndroid StudioJetpack ComposeGoogle PlayFirebaseGoogle PayGraphQLSentryMapbox
FAQ
Android App Development: common questions
Why Kotlin rather than Java for Android app development?
Kotlin is Google’s recommended language for Android app development. Its null safety prevents a common class of crashes, its concise syntax speeds up development, and it works with Jetpack Compose and coroutines. Kotlin is fully interoperable with Java, so we can modernise an existing Java app gradually rather than rewriting it in one go.
How do you make an Android app work on so many devices?
We start from analytics to identify the devices and Android versions your users rely on. We then build adaptive Jetpack Compose layouts using window size classes, optimise start-up with baseline profiles, and test on real devices across manufacturers and memory sizes. Staged rollouts on Google Play let us confirm stability before a release reaches everyone.
How do you secure Android apps?
We store keys in the hardware-backed Android Keystore, encrypt sensitive local data, enforce network security configuration with certificate pinning where appropriate, and use R8 to shrink and obfuscate code. Biometric login uses the platform’s BiometricPrompt. Our engineering follows SOC2-ready and GDPR-compliant practices for handling user data.
Can you build for specialised Android hardware?
Yes. We build for Android-based kiosks, rugged tablets, handheld barcode scanners and Bluetooth peripherals, where native code can talk directly to device sensors and vendor SDKs. These projects often need offline operation and managed-device deployment, which we plan for from the start rather than adding later.
Android App Development
Ready to reach every Android user?
Tell us about your audience and devices. We will plan an Android build that performs on all of them.