Seattle Software Agency SeattleSoftware Agency

Mobile App Development

Cross-platform mobile applications built with React Native — native performance, single codebase, faster time to market.

Building a mobile app means making a critical technology choice early: native iOS and Android development (two codebases, two teams, double the cost) or cross-platform development (one codebase, one team, deployed to both platforms). For most business applications, cross-platform is the right choice, and React Native is our recommended framework.

React Native powers apps used by millions — Instagram, Shopify, Discord, and Coinbase all use it for significant parts of their mobile experiences. It delivers native performance and platform-specific UI while sharing 90%+ of code between iOS and Android. Combined with Expo for streamlined development and deployment, it dramatically reduces time-to-market.

We build mobile applications that go beyond a prototype. Proper state management, offline support, push notifications, secure authentication, and thorough testing across devices — the details that separate a demo from a production app people rely on daily.

What You Get

📱

Cross-Platform Development

React Native with Expo for iOS and Android from a single TypeScript codebase, with platform-specific customization where it matters.

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Offline-First Architecture

Local data persistence with SQLite or WatermelonDB, background sync, and conflict resolution for apps that need to work without connectivity.

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Push Notifications

Firebase Cloud Messaging integration with segmentation, scheduling, deep linking, and analytics to drive engagement effectively.

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Secure Authentication

Biometric login (Face ID, fingerprint), secure token storage in Keychain/Keystore, and OAuth flows for social and enterprise SSO.

🎨

Native UI/UX

Platform-appropriate navigation patterns, gestures, and animations using React Navigation and Reanimated for fluid, native-feeling interactions.

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Analytics & Crash Reporting

Firebase Analytics, Sentry crash reporting, and custom event tracking to understand user behavior and catch issues in production.

Why React Native Over Native Development

For business applications — dashboards, field service tools, customer-facing apps with forms and data — React Native delivers 95% of native performance at roughly 60% of the development cost. You get a single codebase, a single team, and simultaneous releases on both platforms.

The "but native is better" argument is valid for specific cases: graphics-intensive games, augmented reality experiences, or apps that heavily use platform-specific APIs. For everything else, the engineering and maintenance savings of a shared codebase outweigh the marginal performance difference.

Our team uses React Native with Expo, which handles the build toolchain, over-the-air updates, push notifications, and app store submissions. Expo has matured significantly — it now supports custom native modules, meaning you are rarely blocked by platform limitations.

The Backend Matters as Much as the App

A mobile app is only as good as the API powering it. Mobile users expect instant responses on unpredictable network connections, which means your backend needs to be optimized for mobile-specific patterns: minimal payloads, efficient pagination, image optimization, and graceful handling of slow or dropped connections.

We build the API layer alongside the mobile app, ensuring tight integration. This includes optimistic updates (the UI responds immediately while the server catches up), smart caching strategies, and background data synchronization that keeps the app feeling fast even on 3G.

For real-time features like chat, live updates, or collaborative editing, we implement WebSocket connections with automatic reconnection and message queuing to handle the connection instability inherent in mobile networking.

Testing, Submission, and Updates

Mobile testing requires a different approach than web testing. We test on real devices — not just simulators — covering a range of screen sizes, OS versions, and hardware capabilities. Automated testing includes unit tests with Jest, component tests with React Native Testing Library, and end-to-end flows with Detox or Maestro.

Getting through App Store and Play Store review is a process with specific requirements: privacy policies, data collection disclosures, screenshot specifications, and compliance with platform guidelines. We handle the entire submission process. After launch, Expo enables over-the-air (OTA) updates for JavaScript changes — meaning bug fixes and minor features can be pushed to users instantly without waiting for app store review.

Technologies We Use

React NativeExpoTypeScriptReact NavigationReanimatedFirebaseSentry

Frequently Asked Questions

Should I build a mobile app or a responsive web app?
If you need push notifications, offline access, camera/GPS integration, or presence in app stores, build a mobile app. If your users primarily access your product from desktops with occasional mobile use, a responsive web app is simpler and cheaper. Many products benefit from both — a web app for primary use and a mobile app for on-the-go access.
How long does it take to build a mobile app?
A focused mobile app — for example, a field service tool with authentication, task management, photo capture, and offline sync — typically takes 8-14 weeks. More complex apps with real-time features, payment processing, or complex navigation can take 14-20 weeks.
Can you add mobile to our existing web application?
Yes. If your web app has a well-designed API, we can build a React Native mobile app that connects to the same backend. If your web app is a monolith without a clear API layer, we may need to extract an API first, which benefits both the mobile app and the web application.
What about Flutter?
Flutter is a strong alternative to React Native with excellent performance and a beautiful widget system. We recommend React Native because it shares the JavaScript/TypeScript ecosystem with most web applications, making it easier for teams with existing React web apps to contribute to and maintain the mobile codebase.

Need a Mobile App That Works?

Tell us about your mobile app idea. We will help you decide the right approach and build something your users will actually want to open every day.

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