3 interviews. First one was a telescreen with a short chat, and some live coding exercises - took around 30 minutes. Second was around 2 hours(?) which was a technical exam, starting with writing a console application (you're told what it needs to do) whilst explaining your reasoning, whilst you're doing this a few engineers watch and ask questions. This was then followed by a code reading exercise. Third was a culture fit interview, which was just answering questions regarding work ethos and team work etc.

The first round was a phone screen interview. Was invited for the second round technical interview, where I was given a small project to find any bugs or improvements, and was asked to extend a small functionality.