What did that look like?
* Dell XPS with Linux, you also know that everyone else has a Dell XPS and Linux
* An onboarding document to set everything up and it just worked
* Strong focus on using a good IDE/text editor for their TypeScript codebase
* Strong focus on writing TypeScript in such a way that type checking almost always worked
* Well thought out written issues that were self-contained, yet short and to the point
IMO there were a few improvements they could make but you could tell they cared about the developer experience for any programmer working there.
Oh, and if this sounds standard to you / obvious, well, I got news for you. Most companies don't do these type of things ;-)