I build complete Web3 applications from smart contracts to frontend — wallet connection, on-chain interactions, backend API, and database. What's included: — Wallet integration (MetaMask, Phantom, RainbowKit) — Smart contract frontend (wagmi, ethers.js, web3.js) — Backend API (Node.js, Express, MongoDB) — On-chain data integration (Helius, DexScreener, RPC) — Authentication (JWT + wallet address linking) — Responsive React UI I've built and deployed production Web3 applications on Solana and Ethereum mainnet. DM with your project details.