I applied on their website and emailed the job poster with my cover letter. Within 4 days I got a call from HR asking to set up an interview. I accepted and it was scheduled for the following week. The questions were general questions like Why L'Oreal? About situations regarding lab and research that I had did. I prepared well for this interview so nothing really caught me off guard. Anyway, within 3 hours of the interview, I sent a thank you email and within an hour of that, they called me in for an on-site interview the following week. The HR person I had spoken to called me the Monday before the interview (Friday) and explained what I would need to do to prepare. The layout was as such: 1) Case Study on something related to Process Engineering, 2) A 10-15 minute presentation about yourself and a initiative you led or something you accomplished, 3) a grilling panel discussion with the people you presented to, not only about your presentation but also about situations and the usual interview questions which actually were pretty difficult! One thing I will say though, I appreciated HR during the process and them updating me on my status. After the interview, HR had called me to tell me I did not get the job..but I never got that call or voicemail.. so when i emailed HR the following week to find out, they called me right away to inform me nicely that they selected someone else. Which I personally thought was VERY NICE. Because no one cares to go out of their way anymore these days to even tell you that you didn't get it. So i appreciated this a lot and felt less bad about the rejection.