The interview with the hiring manager was challenging and interesting. Well placed professional questions with open answers. Left me with the impression that the data science team knows what they are doing. All involvement with HR, on the other hand, was truly negative: Throughout the process I got late or no answers to my questions. The HR screen interview partner seemed disinterested and badly prepared. Invitations to the following steps took weeks instead of the few days announced. The hiring manger interview invitation mail held an interview description that was completely wrong (e.g. Please prepare for questions on "How to use and implement: arrays, linked lists, stacks, queues, trees, graphs, hash tables, and sets." - which was not even remotely part of the interview). Finally, I never received another message after the interview (which I presumably failed). Highly unprofessional and, frankly, unfriendly.

First interview with HR, it was asked questions about statistics that made sense for the role. They validate the salary expectation and described the benefits (very good). Second interview, Straightforward with their needs for the position. Good conversation with the manager, the guy was sympathetic.