Design, develop, test, deploy, and maintain secure, gas-efficient Solidity smart contracts and decentralized applications on EVM-compatible networks. Responsibilities include contract testing with Foundry or Hardhat, gas optimization, code reviews, security audit remediation, dApp and backend integration, deployment automation, upgrade patterns, CI/CD, on-chain monitoring, and incident response. The role also requires staying current with EIPs, EVM changes, and smart contract security practices.