A Web3 developer can create decentralized applications (dApps) using blockchain technology, such as Ethereum. They can also develop smart contracts, create and manage digital assets on the blockchain, and integrate blockchain technology into existing web applications. Additionally, they may work with decentralized protocols and platforms, such as IPFS and Swarm, to create decentralized storage solutions. They can also develop and maintain decentralized marketplaces, voting systems, and other blockchain-based platforms.

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