Anyone is welcome to build for and on the SushiSwap platform. The smart contracts can be interacted with by anyone on the blockchain. All of our code is also open source and available at our Github. We also have channels on our Discord server (#engineering) where you can discuss development of both our official projects and community projects. Our Dev Docs can be found at https://dev.sushiswap.fi. Please note that the dev Gitbook is still being built and is incomplete.