There were 3 stages to the process; phone screening, group interview and 'the grandparent' interview. Applied online and got a call around 2-3 weeks later. The phone interview had questions about IKEA (i.e. why IKEA, what does home furnishing mean to you, etc.) and lasted around 15 min.
A week later I got a call saying I made it to the group assessment day+ a confirmation email. In addition, there was a form I had to fill out with situational questions (i.e. tell us about a time when you faced an obstacle and how did you overcome it?, when was a time you made a mistake and how did you fix it? etc.) and a personality quiz to complete. The group interview was a week after the confirmation email and I had to bring my portfolio along.
On the day, there were around 9 people (including myself), 6 were going for the Visual merchandising role whilst 2 others + me were going for the Interior Designer role. There were head designers, managers and HR people in the room as well and they were all very friendly. After a brief intro about IKEA, we introduced ourselves and presented the piece of work in our portfolio we were most proud of. Then we had group activities, analysing a specific room (i.e. what is the style of the room? who do you think lives in this room? what would you change about the room? etc.) and split into teams of 3 to build a flatpack (could be a table, cabinet, etc.). Had to present our furniture and talk about where we would place it and how it could be used. After a lunch break, we had a 'feedback' session, which was actually a further interview questioning session. There were 2 people asking situational questions (around 8 Qs) and because I was not expecting it at all, blanked out for a few secs but they helped guide and recollect my thoughts so that was pretty nice of them. That concluded the group interview day and I was told I would find if I pass the round by Friday.
Then on the following day, I got a call back saying I had made it to the 'Grandparent interview' and was asked to come in on the Friday (short notice because the manager was quite busy). I was asked to bring my portfolio again and was told that it was an informal interview with the Design head. True to their word, it was the most relaxed and chilled interview ever, chatting about different cultures, different IKEAs around the world, etc. The only questions he asked were once again, 'why IKEA? what do you think IKEA can offer you, what do you think the differences are between this IKEA and the other one?etc. Showed him my portfolio and chatted a bit more. Overall lasted around 2 hours and that concluded the final interview. Got a call a week later asking for reference checks and now pending (so no offer yet)