Francies Fernandes

What I do

I specialise in React, React Native and Expo, with proven experience owning and delivering complex production mobile applications end-to-end. At Stadion, I was the sole frontend engineer responsible for the entire Retail domain — architecture, development, testing, and production delivery of a large-scale React Native app.

I built a standalone Retail mobile app from the ground up using Expo, delivering complex high-performance UI with Reanimated v4, Gesture Handler, Skia, and FlashList. I implemented scalable state management with Zustand and TanStack React Query including offline support and persistence, and integrated personalisation (Dynamic Yield), search (Algolia), and production monitoring (Firebase Analytics, Crashlytics, Sentry).

Before Stadion, I delivered 35% of a startup's frontend roadmap at Energize Me — building a fitness app with Apple Watch integration, conversational AI, and real-time health tracking. At Aviva, I implemented WCAG 2.1 accessibility across the MyAviva customer-facing platform, employed TDD with Jest, and integrated Adobe Analytics and Qualtrics for data-driven product decisions.

I care about code quality — TypeScript everywhere, comprehensive testing, CI-ready workflows, and clear architecture. I believe great engineering is invisible — it gets out of the way of the user and lets the product shine.