Biometric auth in React Native looks simple until you hit platform divergence: iOS Face ID and Android's fingerprint/face APIs behave differently around fallback flows, and testing both properly requires physical devices, not simulators.
For banking-grade apps, biometrics should unlock a locally-stored key, never replace server-side authentication outright. We pair biometric unlock with a short-lived token refresh so a stolen device can't be used indefinitely even if the biometric layer is bypassed.
Our checklist now runs to 22 items before we call biometric auth production-ready - most of them about graceful degradation when biometrics are unavailable or disabled.
RAG vs fine-tuning: choosing the right approach for your chatbot
A practical breakdown of when retrieval-augmented generation beats fine-tuning for enterprise assistants - and when it doesn't.
Why offline-first still matters for retail POS in 2026
Connectivity fails. Here's how we design point-of-sale systems that never stop selling, even mid-outage.
Sizing battery storage for peak-shaving: a field guide
Lessons from three industrial battery retrofits - sizing, payback periods, and the mistakes we see most.