There are a total of three sections, they're all done as phone interviews (at least for me). The first one being the behavioral part, then the technical part (on phone again). If you pass these two, the project mentor (decided according to your choices) does another interview just to make sure you fit their team.

One interview with potential project mentor. This is after the cv screen. Process didn't seem hugely organised. Good experience overall. Asked mainly about your experience ie to determine fit for their project.