Not Netflix, but we do use notebooks on our internal platform. Long-running notebooks for model training, but you can view their state as they run even after you close the tab or get disconnected from the internet.
We also publish AppBooks, which are automatically parametrized notebooks. However, we automatically detect and track experiments, and then we deploy models in the form of an endpoint to be invoked by consumers, with a convenience page for humans to invoke the code by sending JSON data, or uploading a CSV file.
https://netflixtechblog.com/notebook-innovation-591ee3221233
https://netflixtechblog.com/scheduling-notebooks-348e6c14cfd...