You'll have to go through a series of interviews, but first you have to pass the online assessment. Once you qualify for a position they will contact you for the initial interview with the HR. Then at least 2 more interviews with people from the department where you're considered. The interview is very formal and usually competence based questions are asked and some business case scenarios are given.

The interview process went like this: Application > Online Assessment > Interview. I was declined the position after the interview; but, to be frank, I personally found the online assessment to be way more difficult than the interview. An extreme majority of those automated online assessments suck, anyways...