Native to Cross-Platform Migration
Consolidating two native codebases into one React Native app, migrated screen by screen inside the apps you already ship.
Two codebases, two teams, one product that drifts
Maintaining separate Swift and Kotlin applications means every feature is built twice, tested twice and released twice. In practice they drift: a fix lands on iOS first, Android follows a sprint later, and the two apps develop subtly different behaviour that support has to keep track of.
React Native consolidates that for most screens. Not all: heavy graphics, intensive background processing and deep platform integrations are still better native, and we keep them that way.
The migration happens inside your existing apps. React Native is embedded as a brownfield component and screens are converted one at a time, so you keep shipping from the same store listings throughout.
Teams that start here often pair it with mobile app development, web app development and API integration.
You do not have to choose between two native apps and one cross-platform app. Most products end up with one shared codebase and a handful of screens that stayed native for good reasons.
Why native-to-cross-platform migrations stall
Four things that stop a rewrite-everything approach.
Both apps are rebuilt from scratch, so nothing ships for months and the existing apps still need maintenance meanwhile.
Graphics-heavy or hardware-intensive screens move first, perform worse, and the whole approach gets blamed.
Every native capability is exposed through a chatty bridge rather than a proper native module, and the interface feels sluggish.
The shared implementation matches neither platform convention, so both sets of users feel the app got worse.
What a migration engagement covers
One codebase for most of the app, native where it earns it.
Every screen assessed for suitability, with a written recommendation on what moves and what stays native.
React Native embedded into your existing Swift and Kotlin apps so migration happens inside the apps you already ship.
Networking, state, auth and offline sync moved to shared TypeScript first, which removes drift even before screens move.
Existing native capability exposed through properly written modules rather than chatty bridge calls.
Navigation, gestures and typography follow each platform convention rather than converging on a lowest common denominator.
The same store listings, ratings and CI throughout, with staged rollout on every release.
From screen audit to a consolidated app
Shipping continuously, from the same listings.
Screens assessed for suitability and sequenced by risk, with the native-forever list agreed in writing.
React Native embedded into both apps, with shared navigation and one non-critical screen converted to prove the path.
Networking, state and offline sync consolidated into TypeScript, removing behavioural drift immediately.
Screens converted in sequence, each released behind a flag with crash and performance monitoring by cohort.
A checkpoint on whether remaining native screens should move at all, which for some of them they should not.
The stack behind our consolidations
One codebase, native modules where they matter.
The new architecture removes most of the historical bridge performance objection.
Embedded into existing apps so migration is incremental rather than a rewrite.
Networking, state and sync consolidated first, which stops drift before screens move.
What this looks like in production
Two apps that had quietly become different products
A retail bank maintained separate Swift and Kotlin apps with two teams. Features shipped to iOS first and reached Android around a sprint later, and after three years the two apps validated payee details differently, which support had learned to work around.
We consolidated networking, validation and state into shared TypeScript before converting a single screen. That alone ended the behavioural drift, because both apps now called the same logic.
Screens moved over four months. Card management and the payment flow stayed native, because both used platform security components that had no business being reimplemented.
Consolidation without a rewrite
React Native is embedded into the apps you already ship, so screens move one at a time and you never stop releasing.
We move one slice at a time behind a router, with both systems live, so every step is small and every step is reversible.
A working demo and a written note every Friday covering what shipped, what slipped and what it means for the date. No status theatre.
Nothing goes live in one jump. We run in parallel or behind a flag until the numbers say it is safe to switch over.
