Mobile SDK Developer Needed – React Native & Flutter

We're looking for an experienced mobile SDK developer to build two private UI libraries for our eCommerce platform, Tyviso. What you'll build: A React Native SDK distributed via a private NPM registry A Flutter SDK distributed via private Git dependency or private pub.dev Pre-built, customisable widgets for three products: Gift With Purchase (GWP), Gift After Purchase (GAP), and Rewards Widget types include carousels, banners, pop-ups, modals, and dedicated reward screens — all configurable by the host app (colors, typography, border radius, button styles). Key technical requirements: SDK initialisation via API Key & Client Secret at the app root Real-time cart data handling via a simple method call (e.g. Tyviso.updateCart()) Internal event tracking (impressions, clicks, conversions) — no manual setup needed by the client Must work seamlessly on both iOS and Android Source code must remain fully private You'll also deliver full developer documentation including setup guides, API references, and widget prop definitions. Ideal candidate has: proven experience building and distributing private mobile SDKs, strong React Native and/or Flutter skills, and a solid understanding of secure API integration.