Companies that use Python in their primary stack

Seen some dated posts here on Blind that mention companies like Instagram use Django as their primary framework. Just curious to know if folks know of any other companies that use some Python framework such as Flask or Django? Not for analytics or data science either, want to learn about cases of Python being used to program web servers, etc. For context, I'm not interested in holing myself into one language or framework for work. I work in C# in my job, but recently started messing around with Django in side projects. Curious to know if there are any larger companies that rely on it to serve data over HTTP in situations that require high performance. TC - 176k YOE - 2