# Android App Development > App369 builds native Android applications with Kotlin and Jetpack Compose. Canonical: https://app369.com/service/android-development/ Build your mobile app for iOS and Android, or for Android only. App369 builds native Android applications with Kotlin and Jetpack Compose that reach the world's largest mobile audience with high-performance, Material Design 3 experiences. [**Get Started **→](https://app369.com/contact/) ## **Prefer a fixed price?** Fixed scope, fixed price, paid upfront. The work happens in writing; no call needed. - [**App Fix Ticket**from $450One reproducible bug in an existing mobile or web app, diagnosed and fixed.](https://app369.com/fixed-price/flutter-firebase-bug-fix/) - [**AI-Built App Rescue**from $450A Lovable, Bolt or Cursor app checked end to end in 3 days, then its worst problems fixed at a fixed price.](https://app369.com/fixed-price/ai-app-rescue/) - [**Firebase Security Rules Audit + Fix PR**$950Tests whether one user can read or edit another customer’s data, and fixes what it finds.](https://app369.com/fixed-price/firebase-security-rules-audit/) What Simon builds ## **Android Development Services** 01 ### **Native Kotlin Development** High-performance Android applications built with Kotlin, Google's preferred language for Android since 2019. 02 ### **Jetpack Compose UI** Modern declarative UI development with Jetpack Compose and Material Design 3. 03 ### **Google Play Optimization** App369's ASO strategies maximize your app's visibility through keyword optimization, compelling graphics, A/B tested listings, and staged rollout strategies for risk-free launches. 04 ### **Wear OS Apps** Smartwatch applications for Wear OS that leverage health sensors, tiles, complications, and notifications. Simon builds standalone and companion Wear OS apps with Jetpack Compose for Wear OS for fitness tracking, notifications, and quick interactions. 05 ### **Android TV Apps** Applications optimized for the Android TV and Google TV platform using the Leanback library. Simon builds media streaming apps, content browsers, and interactive experiences designed for the 10-foot UI with remote control navigation. 06 ### **Material Design 3 Implementation** Google's latest design system with dynamic color theming, updated components, and accessibility-first patterns. Simon implements Material You's personalization features that adapt your app's color scheme to the user's wallpaper and preferences. How it works ## **The process** 2. 01 ### **Discovery & Planning** Simon analyzes your business requirements, target audience, and Android-specific opportunities including Wear OS, Android TV, and Google services integration to create a comprehensive Kotlin development plan. 3. 02 ### **UI/UX Design** Simon designs interfaces following Google's Material Design 3 guidelines in Figma, with adaptive layouts that work across phones, tablets, foldables, and Chromebooks. 4. 03 ### **Kotlin Development** Simon builds your app using Kotlin, Jetpack Compose, and Android Architecture Components with MVVM pattern. Simon integrates Room, Retrofit, and Hilt for a scalable architecture. 5. 04 ### **Testing & QA** Testing with JUnit for unit tests, Espresso for UI tests, Firebase Test Lab across device models, and manual QA on real devices. 6. 05 ### **Google Play Deployment** Simon prepares Play Store assets, configures content ratings, manages internal and closed testing tracks, and handles staged rollouts to ensure a smooth launch with crash monitoring. 7. 06 ### **Maintenance & Updates** Ongoing support including Android OS compatibility updates, security patches, Google Play policy compliance, performance monitoring via Firebase Crashlytics, and feature enhancements. Technologies - Kotlin - Jetpack Compose - Android Studio - Room - Retrofit - Hilt Error fixes ## Google Play problems Simon fixes Each page explains the problem from Google Play’s own help pages, with what to change next. - [Google Play Metadata policy](https://app369.com/fix/google-play-metadata-policy/) - [Google Play content rating](https://app369.com/fix/google-play-content-rating-questionnaire/) - [Google Play ratings and reviews policy](https://app369.com/fix/google-play-ratings-reviews-policy/) - [Google Play Contacts permission](https://app369.com/fix/google-play-contacts-permission/) - [Google Play AI-Generated Content](https://app369.com/fix/google-play-ai-generated-content/) - [Google Play personal loans policy](https://app369.com/fix/google-play-personal-loans-policy/) - [Google Play Payments policy](https://app369.com/fix/google-play-payments-policy/) - [Google Play Subscriptions policy](https://app369.com/fix/google-play-subscriptions-policy/) - [Google Play Ads policy](https://app369.com/fix/google-play-ads-policy/) - [Google Play Deceptive Behavior policy](https://app369.com/fix/google-play-deceptive-behavior-policy/) - [Google Play Device and Network Abuse](https://app369.com/fix/google-play-device-and-network-abuse/) - [Google Play QUERY_ALL_PACKAGES](https://app369.com/fix/google-play-query-all-packages-permission/) - [Google Play exact alarm permission](https://app369.com/fix/google-play-exact-alarm-permission/) - [Google Play bundle signed in debug mode](https://app369.com/fix/google-play-app-bundle-signed-in-debug-mode/) - [Google Play debuggable APK or bundle](https://app369.com/fix/google-play-debuggable-apk-or-bundle/) - [Google Play invalid privacy policy](https://app369.com/fix/google-play-invalid-privacy-policy/) - [Google Play account deletion requirement](https://app369.com/fix/google-play-account-deletion-requirement/) - [Google Play sign-in details (app access)](https://app369.com/fix/google-play-app-access-sign-in-details/) - [Google Play minimum functionality](https://app369.com/fix/google-play-minimum-functionality/) - [Google Play prominent disclosure](https://app369.com/fix/google-play-prominent-disclosure-consent/) - [Google Play 16 KB page size](https://app369.com/fix/google-play-16-kb-page-size/) - [Google Play user-generated content](https://app369.com/fix/google-play-user-generated-content/) - [Google Play impersonation](https://app369.com/fix/google-play-impersonation-policy/) - [Google Play background location](https://app369.com/fix/google-play-background-location-permission/) - [Google Play SMS and Call Log](https://app369.com/fix/google-play-sms-call-log-permissions/) - [Google Play AccessibilityService API](https://app369.com/fix/google-play-accessibility-service-api/) - [Google Play health permissions](https://app369.com/fix/google-play-health-connect-permissions/) - [Google Play REQUEST_INSTALL_PACKAGES](https://app369.com/fix/google-play-request-install-packages-permission/) - [Google Play Families policy](https://app369.com/fix/google-play-families-policy/) - [Play “native code, no debug symbols” warning](https://app369.com/fix/google-play-native-code-debug-symbols/) - [Google Play target API level](https://app369.com/fix/google-play-target-api-level-35/) - [Google Play Billing Library version deprecated](https://app369.com/fix/google-play-billing-library-deprecated/) - [App Bundle signed with the wrong key](https://app369.com/fix/google-play-app-bundle-wrong-key/) - [Google Play Data safety form rejected](https://app369.com/fix/google-play-data-safety-form-rejected/) - [Google Play Photo and Video Permissions](https://app369.com/fix/google-play-photo-video-permissions/) - [Google Play foreground service declaration](https://app369.com/fix/google-play-foreground-service-declaration/) - [Google Play version code already used](https://app369.com/fix/google-play-version-code-already-used/) - [Google Play 12 testers](https://app369.com/fix/google-play-12-testers-14-days/) Questions ## **Frequently asked questions** ### **How much does it cost to develop an Android app?** Cost depends on scope, platforms and integrations. App369's rates are published on the fee structure page, and the free app cost calculator gives a range for an Android app with every assumption listed. Simon sends a fixed quote after reviewing your brief. ### **Should I use Kotlin or Java for Android development?** App369 builds all new Android projects in Kotlin. ### **How long does it take to build an Android app?** Simple apps take 2-3 months, medium-complexity apps with Room database, Retrofit networking, and Material Design 3 require 3-6 months, and complex enterprise applications with offline-first architecture can take 6-12 months. ### **What is the Google Play submission process?** Review typically takes 1-7 days for new apps. App369 handles the entire process including Play Store listing optimization and staged rollouts. ### **How do you handle Android device fragmentation?** App369 handles fragmentation with responsive layouts in Jetpack Compose, testing on a spread of real and Firebase Test Lab devices, a minimum API level chosen from your audience's devices, and Jetpack libraries that provide backward compatibility. ### **What are the best monetization strategies for Android apps?** App369 integrates Google Play Billing for subscriptions and one-time purchases, RevenueCat for cross-platform subscription management, and AdMob for advertising monetization. ## **Data and research** - [**Mobile App Market Data 2026**](https://app369.com/statistics/mobile-app-market-data-2026/) App Store billings, iOS and Android share, smartphone ownership and app retention studies, each sourced. - [**Flutter Adoption Statistics 2026**](https://app369.com/statistics/flutter-adoption-statistics-2026/) Survey usage against React Native, Dart usage, GitHub stars and supported platforms. Start here ## **Reach Android Users Worldwide** Android dominates global mobile market share. The [Android app development cost guide](https://app369.com/blog/android-app-development-cost-2026/) shows what drives the hours. Whether you need a native Kotlin app or a [cross-platform Flutter solution](https://app369.com/service/flutter-development/) that also targets [iOS](https://app369.com/service/ios-development/), get a detailed estimate by email, usually within one business day, or book a consultation ($100 per 15 minutes, paid upfront). [**Get in touch **→](https://app369.com/contact/) [**View pricing**](https://app369.com/fee-structure/) Fiverr reviews / 95 on app work ## **What buyers said about this kind of work** [**Read 126 of the 127 reviews **](https://app369.com/reviews/) - - - ### **Read the whole story** - [Sixteen five-star reviews from one buyer: mobile apps, app design and a Shopify store](https://app369.com/case-studies/fiverr/mobile-apps-and-a-shopify-store-for-one-buyer/) (Mark, United States) - [A large custom app build, delivered on the back end and the front end](https://app369.com/case-studies/fiverr/large-custom-app-build/) (A buyer in the United States)