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Sprinx
Mobile Engineering

Native & Cross-Platform Mobile Apps That Users Love

Mobile app development services from Wroclaw. I build performant iOS and Android applications with React Native and native technologies for startups and enterprises.

What I Deliver

Core capabilities I bring to every mobile engineering engagement.

01

Cross-Platform with React Native

One codebase, two platforms. I ship iOS and Android apps simultaneously without compromising on native performance or platform-specific UX conventions.

02

Offline-First Architecture

Local-first data sync with conflict resolution. Your app works flawlessly without connectivity and syncs seamlessly when back online.

03

Push Notifications & Real-Time

Targeted push campaigns, in-app messaging, and real-time data updates via WebSockets to keep users engaged and informed.

04

App Store Optimization

I handle the full lifecycle: CI/CD for mobile, automated testing on physical devices, staged rollouts, and A/B testing for store listings.

Technology Stack

Battle-tested tools I rely on for mobile engineering projects.

React Native

Cross-platform framework for building native mobile apps with JavaScript and React, sharing up to 90% of code between iOS and Android.

Expo

Managed workflow for React Native that accelerates development with OTA updates, push notifications, and streamlined builds.

Swift

Apple's native language for iOS when platform-specific performance or deep OS integration is required.

Kotlin

Modern Android development for features that need direct access to Android APIs or hardware capabilities.

Firebase

Real-time database, authentication, analytics, and crash reporting for rapid mobile backend setup.

Fastlane

Automated build, signing, and deployment pipelines for both App Store and Google Play releases.

My Process

A proven approach refined across dozens of mobile engineering projects.

01

Platform Strategy

I evaluate your requirements to determine the right approach: React Native for speed-to-market, or native Swift/Kotlin for performance-critical use cases.

02

UX Prototyping

Interactive prototypes tested on real devices. I validate navigation flows, gesture patterns, and platform conventions before development.

03

Sprint-Based Development

Bi-weekly releases to TestFlight and internal tracks. You test on your own devices throughout the process.

04

Store Submission & Growth

I handle App Store and Play Store submissions, review guidelines compliance, and post-launch analytics setup.

Related Work

See how I've applied my mobile engineering expertise for real clients.

Frequently Asked Questions

Common questions about my mobile engineering services.

For 80% of business applications, React Native delivers native-quality results with faster development and a single codebase. I recommend going fully native only when your app requires heavy GPU processing (games, AR), deep OS-level integrations, or when the highest possible frame rate is non-negotiable.

I share business logic and most UI code across platforms, but I respect platform conventions. iOS gets native navigation patterns, Android gets Material Design elements. Platform-specific modules handle camera, biometrics, and storage APIs where the abstractions fall short.

Yes. I regularly inherit React Native and native codebases. I start with a health check — dependency audit, performance profiling, crash rate analysis — then propose a stabilization plan before adding new features.

Apple's review typically takes 1–3 days, but rejections can add weeks. I submit early with a TestFlight build, address review guidelines proactively, and maintain a checklist of common rejection reasons to avoid delays.

Yes. Mobile apps require continuous attention — OS updates, dependency patches, crash monitoring, and feature iteration. I offer monthly retainer plans that cover maintenance, monitoring, and a guaranteed response time for critical issues.

Ready to start your mobile engineering project?

Schedule a technical discovery call to discuss your requirements and get a clear roadmap.