Today, developers are expected to "own" their applications. Which means that on top of writing the code they are also responsible for the delivery and the operation of it - you build it, you run it. The industry seems to have a lot of answers how developers can be enabled to do so. But 17 years after DevOps, organisations and people are still struggling. This talk will give an introduction to platform engineering and how it can help to accommodate changing roles and responsibilities. I'll share my experience as a builder of such platforms. How they can successfully be conceived and developed. We'll also talk about common mistakes and why platform engineering without DevOps is just another platform as a service.