Flutter Migration — Legacy iOS/Android to Flutter

Context

A 12+ year old native iOS (Objective-C) and Android (Java) application with an established user base.

Challenge

Full modernisation to Flutter without losing functionality, performance, or the existing user base.

My role

Led migration at IronOne Technologies (2021–2023).

Technical approach

• Built a white-labeling architecture to support multiple brand variants from one Flutter codebase
• Used Flutter Provider for state management and Hive for offline storage
• Migrated Firebase push notifications and rebuilt deep linking from scratch
• Ran a UI/UX redesign in parallel with the technical migration

Outcome

Successfully launched the modernised app across iOS and Android with full feature parity.

What I learned

Phased parity testing against the native app — feature by feature, not screen by screen — was what caught the edge cases that would otherwise have surfaced as production bugs.