Coming to you from Buenos Aires, we sit down with Demi and Facu from Zeppelin Solutions to talk developer experience, upgradability and how they aim to make running software on blockchains simple, fast and error free. We discuss their products - OpenZeppelin, a framework of reusable smart contracts, and ZeppelinOS, an operating system designed specifically for smart contracts - and how these projects have emerged from their work as auditors on some of the most important projects in the space. They introduce their proposal for upgradability, a method for making some alterations to existing smart contracts without impeding immutability. Here are a few links to find out more: https://zeppelin.solutions/ https://openzeppelin.org/ https://zeppelinos.org/ https://ethernaut.zeppelin.solutions/