I went through two interview processes once unsuccessfully the second successfully. After the first unsuccessful interview they were kind enough to let me know that although I was unsuitable for that position, that another (the one I got in the end) was coming up in a couple of weeks. 2 interviews each time. Technical challenge - either in interview or at home in preparation depending on the subject and an in person interview. These could be in any order but you are told in advance etc. HR were great 👍