What is the difference between a Web3 developer and a Blockchain developer?

The difference between a Web3 developer and a Blockchain developer lies primarily in their focus and scope of work. A Blockchain developer typically works on the underlying blockchain technology itself, creating and maintaining the core protocols, consensus mechanisms, and smart contract platforms. Most blockchain developers focus their effort on either making blockchains secure, scalable, and efficient or improving the codebases of existing blockchains. They deeply go into cryptography, data structures, and protocols. A Web3 developer, on the other hand, develops applications on top of blockchains. A Web3 developer would build decentralized applications based on blockchains that have previously been developed, interacting with smart contracts, token dealings, and integrating blockchain aspects into user-facing platforms. While Blockchain developers create the base of technology, Web3 developers build decentralized, user-centric applications within that base in the Web3 ecosystem.