Pretty good and smooth interview process. Almost all the typical questions as for any other technical interview. No need to prepare to something extra specific. One important note: be ready to showcase some of your previous projects or open source contributions
I was interviewing for a contract position through a recruiting company. The interview process was very quick, less than three weeks turn around with three interviews in total. I would say I was expecting it to be more difficult, but maybe since it was a contract position it wasn't as extensive as expected.
The people I talked to were friendly but left me with a negative feeling. The entire process was dragged out, I had to follow up multiple times to see what was going on.