Bridging the Platform UI Gap with GenAI

Ohans Emmanuel

Staff Software Engineer at HelloFresh

I'm a frontend engineer, a technical author with 5+ books published and an avid reader. Since 2017, I've blogged extensively, with my blogs garnering well over 4 million views. I don't promise to know everything, and love fiddling with new technologies.

Bridging the Platform UI Gap with GenAI

At HelloFresh, migrating existing iOS and Android apps to React Native meant rethinking how to deliver consistent cross-platform UI at scale. Ohans Emmanuel (Staff Software Engineer at HelloFresh) shares a real-world journey of using GenAI coding agents to automate and accelerate the conversion of web components into native mobile UI.

▪ The challenge of migrating a massive codebase with 10,000+ React components, including a critical Product Card with 13k lines of code.

▪ Why naive “one-shot” AI conversions fail, and how to work around large contexts, complex states, and deterministic requirements.

▪ Techniques like selective context, breaking work into smaller agent tasks, and enforcing deterministic states with TypeScript.

▪ Building self-correcting agentic flows: having agents write failing tests first, validate implementations, and iterate until outputs matched expected APIs and UI.

▪ How these methods reduced weeks of manual migration work to just hours, while improving consistency across platforms.

A practical, battle-tested case study of how GenAI can meaningfully accelerate cross-platform React Native adoption.