The initial phone screen is purely behavioral. 6 questions about different situations dealing with you and other teammates and difficult situations. Mine was a recording.
The second set is a call with two engineers, they let you talk through a project. One engineer will ask more about the group structure and how decisions were made. The other engineer will ask technical details revolving around the project (problems, solutions, workarounds, etc.)
Lastly, you will be called on-site facing two 45 minute interviews with two pairs of managers. Similar to the interview from above but you will be expected to create a presentation. In this interview, you will be asked technical questions outside of your project as well.