Hybrid stack expertise: Built or significantly evolved a large-scale hybrid mobile architecture in production. React Native and React is the ideal, but a credible alternative with cross-platform mobile depth also works. The key signal is shipping a complex mobile experience that runs on iOS and Android from a shared codebase
Migration at scale: Led a meaningful migration of a mature mobile product onto a new architecture. The interesting signal is doing this on a live, growing product, not a clean-slate rebuild. Bonus if the work touched hundreds of engineers and shipped to a large user base
Principal leadership: You've operated where both the problem and the solution are unknown, and the work spans the whole company. You cut through the noise and bring a large number of leaders to consensus on a clear and compelling technical direction
Cross-platform fluency: Deep mobile fundamentals across iOS and Android, and an instinct for how the same patterns map across web. You understand what the platforms have in common and where they diverge
Active individual contribution: You’re still writing and committing code on a day-to-day basis
AI fluency: Used agentic orchestration in real work. Have a view on what changes for mobile engineering when AI is a daily part of the workflow
React Native: Production experience at scale, not just exposure
Mobile runtime: Bundle delivery, native module boundaries, performance profiling on real device
iOS and Android: Native fundamentals on both, not just the JS side of the bridge
Cross-platform architecture: Build once, ship to multiple runtimes without losing native feel
Mobile performance: Performance, reliability monitoring, and optimisation at scale
Deep fundamentals: Engineering fundamentals from a CS background, including data structures, complexity, the hard parts