Building a Web3 startup necessitates the creation of a robust developer community, a critical component for the success of projects in the crypto space. These communities, exemplified by Ethereum's, are formed around shared visions and provide key infrastructure, like the Ethereum Virtual Machine, that supports a wider ecosystem. Web3 founders are encouraged to engage developers through tactics such as iterating gradually, defining community purposes, and fostering early member interactions. Despite the absence of a definitive playbook, common strategies include creating content to drive engagement, nurturing one-to-one connections, and providing developer incentives like bug bounties and grants. These efforts aim to attract dedicated developers whose contributions can help scale projects and foster innovation. Although challenging, building a developer community can yield significant rewards, with founders advised to draw inspiration from established communities and remain patient as they cultivate an engaged, supportive network.