In this project I contributed to building a cross-chain DeFi lending protocol on Polkadot. I developed both the marketing landing page and the core platform application within a Turborepo monorepo architecture, leveraging Next.js 15, React 19, and TypeScript. On the technical side, I built a comprehensive package architecture including the @repo/onchain package with full Polkadot.js SDK integration featuring custom type-safe RPC calls for lending operations (asset prices, user LTV calculations, pool data, liquidation markets). I implemented transaction hooks for core DeFi operations including supply, borrow, repay, withdraw, and collateral management, alongside liquidation marketplace bidding functionality. The platform features data-rich interfaces built with TanStack React Table and Recharts for portfolio tracking, market analytics, and liquidation monitoring, all optimized through TanStack React Query for efficient caching and state management. Additionally, I created the landing page featuring a 3D kylix (goblet) with impressive animations using React Three Fiber, enhancing the visual identity and user engagement. In my advisory capacity, I provided strategic guidance on Substrate chain integration patterns, custom RPC architecture design, and wallet connectivity solutions using Polkadot extension standards. I helped establish a scalable monorepo structure with shared packages for onchain utilities, UI components, hooks, and type definitions, ensuring code reusability and maintainability across the platform.