Job Description: 1. Design, develop, and audit blockchain smart contracts, ensuring security and scalability. 2. Design on-chain/off-chain interaction solutions to enable trusted data on-chain. 3. Collaborate with the Java backend team to integrate and test contracts with business systems. 4. Research security vulnerability prevention for contracts and write technical documentation and deployment specifications. Qualifications: 1. Bachelor's degree or above, with 2+ years of Solidity development experience. Familiar with the Ethereum/other public blockchain ecosystems. 2. Proficient in common smart contract security issues (e.g., reentrancy, overflow). Experience in contract auditing is a plus. 3. Knowledge of Oracle technology (e.g., Chainlink) and familiarity with Web3.js/ethers.js. 4. Passionate about blockchain technology, with strong learning ability and innovative thinking.