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MOBILE ENGINEERING

Mobile App Development

iOS and Android. One Codebase. Zero Compromise on Performance.

Cross-platform doesn't have to mean "almost native." With the right architecture and senior engineers who've shipped production mobile products, you get iOS and Android apps that users can't distinguish from native — at a fraction of the build cost.

SINGLE CODEBASE60–70% faster delivery than separate native builds
OFFLINE-FIRSTLocal sync — works without a reliable connection
NATIVE API ACCESSCamera, biometrics, push, location — all supported
END-TO-END DELIVERYApp Store and Play Store submission handled
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PROBLEM VS SOLUTION

Where Cross-Platform Apps Go Wrong

Pain PointGeneric ApproachHardened Soft
Janky animations, poor feelReact Native defaults, no native optimizationCustom native modules, Reanimated, and Skia where performance demands it
Offline doesn't work properlyAPI-dependent architecture, breaks without connectionOffline-first data model with WatermelonDB or SQLite sync
Two builds double the costTwo teams, two codebases, double QAUnified codebase, shared business logic, platform-specific UI layer only where needed
App Store rejection cyclesFirst submission only, no support afterPre-submission QA checklist, guideline compliance review, resubmission support
Backend not built for mobileWeb API retrofitted for mobileMobile-optimized API: pagination, payload optimization, push delivery infrastructure
Slow iteration speedLong release cycles, no OTA updatesOTA update capability via Expo EAS or CodePush for non-native changes
CORE CAPABILITIES

What We Build on Mobile Engagements

React Native & Flutter Architecture

  • Framework selection based on team skills, native module requirements, and performance profile
  • Navigation architecture: deep linking, tab structures, and modal flows built correctly from day one
  • State management: Redux Toolkit, Zustand, Riverpod — matched to your app's complexity
  • Code sharing strategy: maximizing shared logic between iOS, Android, and web

Offline-First & Data Sync

  • Local database with background sync: WatermelonDB, SQLite, Realm
  • Conflict resolution strategy for multi-device and multi-user offline scenarios
  • Queue-based API retry logic for intermittent connectivity
  • Optimistic UI updates with rollback on sync failure

Native Device Integrations

  • Camera and media: image capture, video recording, gallery access, document scanning
  • Biometric authentication: Face ID, Touch ID, and Android biometric API
  • Location services: foreground and background location, geofencing
  • Push notifications: APNs (iOS), FCM (Android), with notification center management

Performance Optimization

  • JS thread and UI thread profiling — identifying and eliminating frame drops
  • Image and asset optimization: lazy loading, caching, and compression pipelines
  • Bundle size optimization: code splitting and tree shaking for faster cold starts
  • Memory leak detection and fix cycles integrated into QA process

App Store & Play Store Delivery

  • End-to-end App Store Connect and Google Play Console management
  • Automated build pipelines: Expo EAS, Fastlane, or GitHub Actions
  • TestFlight and Android internal testing distribution from sprint one
  • App Store Optimization (ASO): metadata, screenshots, and keyword strategy
TECH STACK

Technologies We Use on Mobile Engagements

FrameworkReact Native, Flutter
State ManagementRedux Toolkit, Zustand, Riverpod
Local DB / SyncWatermelonDB, SQLite, Realm
NavigationReact Navigation, Expo Router, GoRouter (Flutter)
AnimationsReanimated 3, Skia, Lottie
Backend (Mobile API)Node.js, GraphQL, REST
Push NotificationsAPNs, FCM, Expo Notifications
CI/CDExpo EAS, Fastlane, GitHub Actions
AnalyticsMixpanel, PostHog, Firebase Analytics
HOW WE WORK

The Mobile App Delivery Process

WEEK 1

Platform & Architecture Decision

Framework selection, navigation architecture, state management strategy, offline requirements, and backend API contracts defined. App Store and Play Store account setup verified.

WEEKS 1–2

Design & Prototype

UX wireframes, interactive prototype, and platform-specific design review (iOS HIG and Android Material compliance). User-tested before any native code is written.

WEEKS 2–10

Build Sprints

2-week sprints with TestFlight and Android internal track distribution at the end of each sprint. Real device testing on iOS and Android from sprint one.

FINAL SPRINT

Store Submission & Launch

Final QA, performance profiling, App Store and Play Store submission, and launch support. Post-launch crash monitoring with 24-hour response.

WHY HARDENED SOFT

What Every Mobile Engagement Includes

One codebase, two platforms, no shortcuts on quality. Every mobile app we ship is performance-profiled on real devices, App Store compliant, and fully yours — code, accounts, build pipelines, and all. A 2-week demo cadence via TestFlight or Android internal track means you're always holding a real build, not reading about one.
FAQ

Common Questions About Mobile App Development

React Native or Flutter — which do you recommend?

React Native is the better choice if you have web developers who need to contribute, or if you need a web version of the same product. Flutter is better for highly custom UI, complex animations, and teams starting fresh. We'll give you a recommendation after understanding your team and product requirements.

Will the app feel native or will users notice it's cross-platform?

With proper architecture and senior engineers who know the platform idioms, users don't notice. We use Reanimated and native modules where performance demands it. We don't build with the default component library if it creates a substandard experience.

How long does App Store review take?

Apple's review is typically 1–3 days for the first submission, Google Play is 1–7 days. We build review time into your launch timeline and handle rejections as part of our delivery scope.

Can you add a mobile app to our existing web product?

Yes. This is common. We audit your existing backend API for mobile readiness, identify optimization points, and build the mobile app against a contract API spec.

Do you maintain the app after launch?

We offer post-launch support retainers covering OS version compatibility, bug fixes, and minor feature additions. We also handle App Store and Play Store update submissions.

Ready to start a project?

No sales scripts — just an honest technical conversation about your requirements, timeline, and budget.

📩 contact@hardenedsoft.com

EN — DESIGN & STRATEGY
Alex
UA — OPERATIONS
Bohdan