We Ported Our Entire Mobile App from Flutter to React Native in Two Weeks
Article Summary
Shoaib Akhtar from ZAR Engineering just rewrote their entire production fintech app in two weeks. The old rule about never rewriting from scratch? AI just changed it.
ZAR's mobile team ported a complex Flutter app with 40 packages to React Native in 14 days using Claude Code and automated workflows. They documented exactly how they pulled it off, from writing precise specs to coordinating parallel development streams.
Key Takeaways
- Used 'ralph loop' technique with Maestro to generate 80% of code automatically
- CLAUDE.md file became critical: precise specs produced clean code, vague ones created chaos
- Split remaining 20% across focused teams, each pairing with Claude on specific domains
- Built comprehensive e2e test suite for iOS and Android concurrently during rewrite
- Gained OTA updates and opened development to entire React ecosystem
A fintech team rewrote their production mobile app and added full test coverage in two weeks by treating AI as a code generator that needs engineering discipline, not magic.
About This Article
ZAR Engineering's leadership wanted their production fintech app rewritten from Flutter to React Native in just two weeks. The team had to push back against the assumption that rewrites always fail.
The team wrote a detailed CLAUDE.md file to document their architecture and coding standards. They used the ralph loop technique with Maestro to break the work into small, manageable pieces. Claude Code generated fresh code for each iteration without losing context.
They finished the complete rewrite in 14 days and built an end-to-end integration test suite for both iOS and Android. The app now supports OTA updates, and the whole company can contribute to front-end development using React.
