ARxIUM interview questions

For my first interview I was required to do an in-person CAD test that took around 45 minutes. I had to recreate two parts that were given to me in SolidWorks. After this, I had 3 more remote interviews on teams that worked its way up the ladder each time until I was meeting with the head of product development for the company. All of this around the second week of February and my final interview was near the beginning of March, after which I was required to provide a transcript, and three references. They also mentioned that they would be doing a background check at some point as well. Complete silence after this. I patiently waited two weeks for a verdict with no response, so I sent an email inquiring about the position to HR. Nothing. I sent another one week later in case they had missed the first one. Nothing. I even sent one outside of HR on the chance that the department had collapsed in on itself. Nothing. Ghosted after all of that time and effort. Incredibly rude and unprofessional. If this is how they treat people, I should count myself lucky that I did not receive an offer.