App-Entwicklung: Cross-Platform Migration

Cross-PlatformMigration

Migrating two separate native apps into one cross-platform codebase is not a lift-and-shift – it is a strategic decision that requires careful planning. We analyse your existing apps, develop a migration strategy that does not disrupt live operations, and carry out the migration incrementally – feature by feature, with clear quality gates.

Challenges you'll recognise

  • You maintain two separate native codebases that keep diverging – synchronisation effort is consuming your team.
  • Native developers for both iOS and Android are hard to find and expensive – a shared codebase would solve the bottleneck.
  • You want to tackle the migration but cannot afford any interruption to live app operations.

Inventory Analysis

Before a single line of code is migrated, we thoroughly analyse the existing apps: architecture, external dependencies, platform-specific features, technical debt, and critical user flows. This analysis determines which strategy – big bang versus incremental – makes more sense for your app.

Migration Strategy

For most production apps we recommend incremental migration: new features are developed in the cross-platform technology while existing native code is replaced step by step. This minimises risk and enables continuous delivery throughout the migration.

Quality Assurance

Migrated screens are tested on real devices against the original app – visually, functionally, and for performance. We define clear quality gates that ensure the migrated version is at least as good as the original before the next screen is addressed.

Technical Debt

A migration is the opportunity to eliminate technical debt – not carry it into the new technology. We identify poor patterns in the existing code and implement migrated screens with clean architecture that remains maintainable long-term.

Good to know

  • Incremental Migration

    Rather than the risky big-bang migration, we recommend an iterative approach for production apps: feature by feature is migrated while the app continues to be developed and deployed continuously.

  • Eliminate Technical Debt

    A migration is the ideal opportunity not to carry poor architecture decisions forward. We migrate with a fresh eye on code quality and long-term maintainability.

  • Inventory Analysis First

    Without a thorough analysis of the existing code, any migration plan is speculative. We analyse first – and then provide a realistic assessment of effort and risks.

Frequently asked questions

Can I migrate a production app without interrupting operations?
Yes, with incremental migration. Individual screens or features are migrated and deployed while the rest of the app continues running natively. Users do not notice the migration – they simply see continuous improvements.
How long does a cross-platform migration take?
It depends strongly on the scope of the app and the quality of the existing code. A small app can be migrated in weeks; a complex production app needs months. We give a realistic estimate after an inventory analysis.
Is migration worthwhile if the app already works well?
The long-term maintenance benefits are often compelling nonetheless – especially if features need to be delivered synchronously on both platforms frequently. We help you weigh effort against benefit.

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Why nextlevels

Success you can measure

With us you're always one step ahead technologically and tap directly into our extensive app development expertise. We take a close look at your app idea, identify key success factors and create tailor-made applications. Your visions and goals are at the heart of our joint project work.

  1. Expert knowledge in app technologies

    React Native, Flutter, native iOS and Android — we pick the stack to fit your project, not our preference.

  2. Comprehensive user experience know-how

    Intuitive operation and seamless interactions decide ratings and how long users stay in the app.

  3. Proven track record

    Published apps in the App Store and Play Store — from MVP to mature platform.

  4. Versatile team

    Concept, design, development and backend from one hand — no friction at the interfaces.

  5. Long-term partnerships

    We stay after launch and keep evolving your app with maintenance and updates.

READY FOR YOUR APP THAT SETS NEW STANDARDS?

Whether you want to optimize an existing app or bring a new vision to life – we'd love to meet you. A no-obligation conversation is always a great start.

Profile picture of Paul Kalisch, Executive Partner
Paul Kalisch
Executive Partner

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