How is LinkedIn as a place for software engineering?

I am interviewing with LinkedIn and the only sources I could find about the company were glassdoor and their engineering blog. However, when I search for further information about the company on Hacker News and Reddit, it's mostly about people using the service itself rather than about the work environment there.

So does anyone have any experience with LinkedIn? They told me they had a lot of people from Amazon and Google, and they work extensively in open source (I find this aspect very appealing).