I will integrate smart contracts into your existing Web3 application

I specialize in connecting smart contracts to real applications — backend models, payment flows, wallet authentication, and frontend integration. What's included: — Smart contract integration with existing backend (Node.js / Express) — Payment flow implementation (deposit, withdraw, transfer) — Wallet authentication linking (JWT + wallet address) — Frontend connection (wagmi, ethers.js, RainbowKit) — Oracle integration (Chainlink price feeds) — Testing and edge case coverage Recent work: full payment system integration for a supply chain management platform — Solidity contracts, Chainlink USD/ETH oracle, wagmi frontend. Fixed price. 1 week delivery. DM with your project details.