Crescendo Technology Machine Learning Engineer interview questions

Long first interview with HR. Straightforward test in R. Panel interview with IT and ML team. After 3 rounds of interviews I was told that in a few days I'll receive a case study but didn't hear back from them since then which I found to be a bit unprofessional. Here's the interview process: The initial interview was longer than other behavioral interviews. It took about 1 hour but moslty consisted of routine HR questions. R test on some basic R functionalities such as merging cleaning, transfering, etc. The technical team were professional and nice but they stroke me as a young and developing team. There are defenietly areas for them to improve.