Service

Mobile App Development

Native Android apps in Kotlin and Java, or cross-platform apps with React Native. From UI design to Google Play submission - we handle the full mobile development cycle.

CategoryMobile Development
StackKotlin / React Native
EngagementProject-based
Contactcontact@kalenux.com.tr

What this service covers

We build native Android applications in Kotlin and Java for projects that require peak performance or deep hardware access, and cross-platform applications with React Native for products targeting both Android and iOS from a single codebase. Five published Android apps on the Play Store means this experience comes from real submissions, real user reviews, and real production incidents - not a development environment.

The technical depth goes beyond screens and navigation. We handle hardware integration - camera, sensors, biometrics, Bluetooth, NFC - along with local databases using Room or SQLite, background services, push notifications via Firebase Cloud Messaging, in-app purchases, and offline-first data architectures where the app remains fully functional without a network connection.

The engagement covers the complete cycle: UX wireframes reviewed and approved before development begins, iterative builds with internal testing, Play Store submission with listing copy and screenshots, App Store Optimisation, and post-launch monitoring so issues surface before users write one-star reviews about them.

Deliverables and outcomes

UX wireframes and user flow

Before development, we map out every screen and transition. You review and approve the flow before a line of code is written.

Native Android build (Kotlin/Java)

Or a React Native cross-platform build targeting both Android and iOS. We recommend native for apps that need deep hardware access, React Native for apps where shipping on both platforms from one codebase is the priority.

Google Play Store submission

We handle the Play Store listing: app description, screenshots, feature graphic, content rating, privacy policy link, and the submission process itself.

App Store Optimisation

Keyword-optimised title and description, properly configured categories and tags, A/B tested store listing elements to maximise organic installs.

Push notifications

Firebase Cloud Messaging (FCM) integration for remote push notifications, or local notifications for scheduled and event-triggered alerts.

Offline-first architecture

Local database (Room or SQLite) for data that needs to work without a network connection, with sync logic to reconcile local and remote state when connectivity returns.

Crash analytics and monitoring

Firebase Crashlytics or equivalent integration to capture crash reports and ANRs from production devices, with alerting for new crash types.

Source code and documentation

Full source code in a Git repository, build configuration, signing keystore guidance, and a developer handover document.

Our process

Mobile projects start with wireframes and a defined data model so every screen has a clear purpose before any code is written. Development proceeds in iterative builds that can be installed and tested on real devices, moving through internal QA and into a Play Store submission we handle end to end.

Step 1Requirements and UX wireframes - every screen and transition mapped out and approved
Step 2Architecture and data model - local storage, API integration, offline sync strategy defined
Step 3Development in iterative builds - testable APK delivered at each milestone
Step 4Internal QA testing - real devices, edge cases, performance under constrained conditions
Step 5Play Store submission - listing, screenshots, content rating, privacy policy, submission
Step 6Launch monitoring - crash analytics active, ratings and reviews tracked post-launch

Tools and technologies

Native Android
KotlinJavaAndroid SDKJetpack
Cross-platform
React NativeExpoJavaScript/TypeScript
Data
RoomSQLiteRetrofitOkHttp
Services
Firebase AuthFirebase FCMFirebase CrashlyticsGoogle Play

Ready to build your mobile app?

Tell us the platform, the use case, and what success looks like. We'll take it from there.