Android App Development Services for US & EU Brands

New projects start on Kotlin 2.x with the K2 compiler, target SDK 35 (Android 15), and set minSdk to 26 (Android 8.0) which covers roughly 95 percent of active US/EU devices. Google Play's policy requires targetSdk to be within one year of the latest major release, so we plan SDK upgrade sprints into the annual roadmap. For B2B fleet apps on rugged devices we drop minSdk to 24 (Android 7.0) with isolated AndroidX backports. Jetpack Compose is the default UI layer; View/XML interop is kept for legacy modules and CameraX/PdfRenderer paths where Compose is still catching up.

We run a pre-flight against the most common rejection categories: Data Safety form mismatched against actual SDK behaviour, missing Account Deletion (required since May 2024 in-app and from the web), foreground service types not declared correctly on Android 14+, restricted permissions without a Permissions Declaration Form (SMS, Call Log, AccessibilityService, MANAGE_EXTERNAL_STORAGE), and Families policy violations. We also fix the Pre-Launch Report crashes Google runs on Firebase Test Lab devices before our internal release, which catches 80 percent of post-publish 1-star reviews.

Google Play Billing Library 7.x is the default for digital goods (Play policy still requires it inside the Play distribution channel for most categories). For EU users we implement the User Choice Billing pilot where eligible — users see Play Billing alongside the developer's own processor, with the corresponding service-fee reduction (3 percent). For DMA-relevant categories we support alternative distribution via direct APK install flows with the proper Install Unknown Apps user prompts, and we keep a separate Play track for the same app. Subscriptions use the new base-plan/offer model with proper price-change consent flows.

Compose-first since 2023 for all new code: Compose 1.7+ with the strong-skipping mode, Compose Navigation with type-safe routes, Compose Material 3 with dynamic color, and Compose for Wear OS where the product extends to watches. ViewModels use Kotlin Coroutines and StateFlow, dependency injection via Hilt, data layer with Room and DataStore. We still embed AndroidView/ComposeView interop for CameraX preview, AdMob native ads, ExoPlayer (Media3), and PdfRenderer until Compose-native equivalents are production-ready. Baseline Profiles are generated for every release to keep cold start under 500 ms on mid-range devices.

GDPR-aligned by design: lawful basis documented per data category, Google's User Messaging Platform (UMP) SDK for IAB TCF v2.2 consent in the EU, granular data export and account deletion (also a Play policy requirement), and DPAs with every third-party SDK. The Data Safety form is filled from a single source of truth that we audit against the actual SDKs in the bundle — mismatch is the #1 cause of policy enforcement actions. For EU customers we host backend infra in eu-central-1 or europe-west3, enable Android Privacy Sandbox where the product uses ad attribution, and keep PII out of Crashlytics/Sentry with breadcrumb scrubbing.

Pricing starts at 12,000 EUR/month per dedicated team (one senior Android engineer + part-time tech lead, QA, and PM allocation). Standard product team is two senior Android engineers + tech lead + QA + designer + PM at 28,000–34,000 EUR/month. Project sprints (e.g. Compose migration of one feature module, Play Billing 7 upgrade, targetSdk bump with foreground-service refactor) start at 25,000 EUR for a 6-week fixed-scope engagement. CET workday with 9 AM–1 PM ET overlap. Three-month minimum on dedicated teams, then month-to-month with 30 days notice.