Most of the interview focused on questions about the code from the previous stage, as well as what changes or improvements I would suggest, followed by some questions about OOP.

The first stage of the interview process consisted of filling in some forms about your technical skills, experience with programming languages, projects - it takes about 15 minutes, and solving an online test on their own online ide, similar to hr (you get an hour and a half, one programming problem in java, with strings)