I did the online application and was invited to take the online test. Based on the application and the online test I was offered a phone interview. Put time into answering the questions in the online application properly, I believe these impact their decision.
The phone interview was 30 minutes and they ask you basic questions to see if you understand the company, role and industry. There will be some basic competency and situational questions as well.
I took the online assessment centre. It was really well organised, and they give you plenty of information ahead of the day. They will tell you about the exercises, and that information is more than enough to go off of. I had 1 interview for about 1 hour, with competency, industry understanding and examples of past experience type questions.
I heard back really quickly, expect to hear in 1 week max. I was really impressed with the organisation of their assessment centre.