Phone interview followed by coding task (for one evening), followed by conversation with their TL about the position, followed by another phone interview. Then they invited me to the office, where I had another 5 1:1 interviews, approximately 1 hour each. All of the interviews were technical.

There was a great variety of questions, mainly focusing on high performance techniques such as low-level stuff. The topics included:

1. Atomic data structures
2. System internals, for example, system calls overheads
3. Modern c++ features, including variadic templates, etc.