In his presentation, Karol talked about the topic that interested him greatly, even before he joined Google: how does Google remain productive at such an unparallel engineering scale?
Google's engineering team is gigantic. Thousands of teams, engineers, and projects - a lot with their custom tech stack, needs, and preferences. What are the core building blocks that allow us to build new products in a complex and diverse environment? The answer lies within a few simple technologies that we're building on to not only achieve it but to do so productively.
Here's the link to the recording.