I applied on my university's job board and was contacted by a recruiter a week later. Then set up a Skype interview then 3 rounds of onsite interviews. The Skype interview is about how to measure / boost incremental revenue and then a case to calculate the conversion rate needed (same as someone's post here). Onsite interviews include 2 technical ones and 1 behavioural. One technical is similar to the skype interview with a case and some simple calculations. The other one is a 9-step predictive model involving level, season, and trend effects. You need to figure the model out in 25 minutes and explain what each step is doing.

I could not complete all the steps due to unprofessional interview process management. Two different HRs contacted me. After I shared my availability for the next interview, they sent me 2 different emails which were not related to my interview process. I asked for clarification about the process and send me the correct slot, but I did not get an answer for 4 days. In the end, HR call me and said all of a sudden they decided to hold the hiring process for this position. I spent 2 days on the case study and this is really unprofessional. I had concerns about the company because of having a low rating on Glassdoor but now understood why people are complaining that much. 1- Codility Challenged -- passed 2- HR screening call -- passed 3- Hiring Manager -- passed 4- Case Study -- delivered but the position on hold