They have an online interview with maths and puzzle questions and some coding in Ruby. Later their is an in person interview that includes more puzzle/logical questions and then a pseudo programming test with a discussion about answers and scalability of solutions.

Online tests followed by a face-to-face. Tests are very straightforward, the interview tries to make you think, although its clear that they have a structure they want you to follow to hit certain criteria. The people were friendly, but no feedback afterwards.